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Paper Abstracts of “2011 Far East F
Source:    Publish Time: 2011-07-28 22:50   2364 Views   Size:  16px  14px  12px
【WZ001】Making Codes for Advanced UT MethodsZheng zhenshun, Edward GinzelMaterials Research InstituteAbstract: Advanc

【WZ001】Making Codes for Advanced UT Methods
Zheng zhenshun, Edward Ginzel
Materials Research Institute
Abstract: Advances in ultrasonic testing over the past 10-20 years include the use of Time of Flight Diffraction and Phased array ultrasonic testing. In spite of a nearly 20 year long presented in the industry, these advances are still often not being used even thought they are superior in many ways to the traditional manual UT techniques. The reason they are under-used is primarily due to a lack of codes and standards that engineers can draw on. This presentation will point out some of the issues and illustrate a variety of recent developments in ASTM codes that attempt to address this short-coming.
【PF002】Ultrasonic Test for the Process Piping Butt Weld
LI Zhao-tai, WANG Cheng-sen, HUANG Zhi
Nanjing Jinling Inspection Engineering Co., Ltd.
Abstract: Considering the characteristics of the process piping butt weld, this article analyses the welding methods, the welding positions and the defects which are easily produced. As the range of thickness of the process piping butt weld is large, furthermore, the joints are almost among pipe fittings, such as straight pipes, elbows, flanges and valves, so we choose one formation welding. Due to the special structure and welding craft, UT only conducts single-sided bilateral scanning or single-sided unilateral scanning; in order to raise the defect inspection rate, we should choose scanning surface, probe quantity, models and size for different scales and structures of welding joints with pertinence. It puts forward higher requirement for the linear adjustable accuracy of apparatus scanning to judge the root defect. We analyses the characteristics of the waves of typical defects. By the analyses and measures above, it improves the test quality of the process piping butt weld effectively.
Keywords: Process piping butt weld; Ultrasonic test
【PF003】The Radiograph of A Circumferential Fillet Weld Between Straight Pipe and Flange
HUANG Ting-Ting,WANG Jin-Ping,SU Ning
(Shanghai Shanhong Industry Development Company Ltd, Shanghai,200065)
Abstract: The merits and demerits of two radiographic ways about circumferential fillet weld between straight pipe and flange are compared. The calculus of radiographic angle as the source is far from the circumferential weld plane is discussed, and the feasibility of exposure times could be judged thereby. An acceptance standard of enterprise procedure for radiographic examination which was prepared in the light of ASME boiler & pressure vessel code is introduced. The shapes of L.O.P accepted in such partial penetration weld are investigated and its use as a reference to film interpretation is put forward.
Keywords: Fillet weld; Radiographic technique; Radiographic angle; L.O.P & L.O.F
【PF004】The Research of Acoustic Emission Test on Safety Valve Leak
Zhongzheng Zhang, Hua Liang, Wensheng Cai, Jun Jiang,Qiang Cui, Xuefeng Fang
Nanjing Boiler & Pressure Vessel Supervision and Inspection Research, Institute, Nanjing, 210002
Abstract: In the paper, one case of acoustic emission test on safety valve leak was done and the signals characteristics were analyzed in parameters and waveform analytical method. The results indicate that the acoustic emission technology can effectively detect and monitor leak of safety valve; Hit counts and amplitude parameters can characterize the different stages of leak; the leak signals frequency range is from 0 Hz to 500KHz and center frequency is about 60KHz in the case, for others case the frequency characters need further research. The research result will provide important references for safety vavle’s on-line monitoring and detection, calibration, etc. aspects.
Keywords: Safety valve; Leak; Acoustic Emission; Test
【PF005】The Recent Developments of Pulsed Eddy Current Nondestructive Testing Technology
Deqiang ZHOU1, Guiyun TIAN2, Haitao WANG2, Lihua YOU1
(1.School of Mechanical Engineering, Jiangnan University, Wuxi, 214122
2. College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016)
Abstract: Pulsed eddy current testing (PECT) is a new eddy current testing technology. As the width spectrum of the excited current or voltage, it is widely used in aerospace, pressure vessels, railway, pipe and so on. The recently research progress including the defect of metal, stress of components, and thermal imaging of pulsed eddy current were discussed. The future trend of development was analyzed.
Keywords: Pulsed eddy current; defect; stress; thermal imaging
【PF006】Error Analysis of Ultrasonic Phased Array in Weld Inspection
Liu Xiaorui1 XiaoXiong3 Qiang Tianpeng2 Wu Guanhua1 Zheng Kai2
1. Key Laboratory of Nondestructive Test (Ministry of Education), Nanchang Hang Kong University, Nanchang 330063, China
2.Jiangsu Province Special Equipment Safety Supervision Inspection Institute, Nanjing 210003,China
3. Jiangsu Zhongtechuangye Equipment Inspection Co., Ltd., Nanjing 210014; China
Abstract: Phased array ultrasonic technology will be more and more important in the NDT fields as one of the leading edges of the NDT research. In this paper,we use the phased array technology to inspect some of the typical butt weld defects, then contrast the results with the data from UT and RT inspection and then do error analysis for the defect detection and sizing capability. Through the experiment we can find that ultrasonic inspection of butt welds using phased array is verified to be a viable option with high efficiency.
Keywords: PAUT; Weld; Error Analysis
【PF007】Exploration and Reflection on Wike Ropes Testing for Nanjing Sanchahe River Gate
Xu Jianqin, Huang Kan, Dong Xinhua, Lin Bo
Jiangsu Province Special Equipment Safety Supervision Inspection Institute
Shanghai Qiehua Virtual Instrument Technology CO,LTD
Abstract: According to the Exploration about wire ropeic testing for Nanjing Sanchahe river gate and MTC magnetic testing computerized instrument for wire ropes, the paper reflects on possibility and necessity in wire ropes detector online and suggests that non-destructive order receipt it
Keywords: Sanchahe Riven Gate Wire Ropes Testing Instrument Non-Destructive
【PF009】Acoustic Emission Monitoring on Tensile Process of H62 Copper Specimens and its Data Analysis
LI Wei-Zhong, WANG Bing, LIU Yan-Lei, HAN Shu-Xin, SHENG Shui-Ping
(Hangzhou Special Equipment Inspection Institute, 310003)
Abstract: Recently, Copper material has been widely used in chemical industries because of its good corrosion resistance. Application of acoustic emission technique to detect copper pressure equipment may be one of effective methods. This paper produced H62 copper tensile specimens, which stretching process was monitored by acoustic emission technique. The results show that, the copper has a shorter elastic stage; less high-amplitude signals were brought out when tensile specimen was broken because of its high visco-elastic characteristics; the effective number of acoustic emission signals related with the loading rate with the same copper specimen. And there were more effective acoustic emission signals with a faster loading rate; copper material waveform peak of acoustic emission signals appeared in the range of 210-340 kHz. Conclusions can be referred when acoustic emission monitoring was carried out for copper pressure equipments.
Keywords: Copper; tensile test; acoustic emission monitoring; data analysis
【PF010】Experimental Research on High-Temperature Pipe Corrosion on-line Monitoring
DING shoubao, YE yufeng, XIA Li, YUAN Yaming
(Zhejiang Special Equipment Inspection and Research Institute, Hangzhou 310020, China)
Abstract: It is introduced the theory of Ultrasound guided wave detection and the principle of using guided wave on on-line monitoring; At the same time , we make use of the guided wave on 7 high temperature pipes in Catalytic Cracking Unit, and take pipe 03-13 as an example to monitor its corrosion and analysis the data, at last Obtained based on the magnetostrictive effect of guided wave technology allows the monitoring of high temperature corrosion of pipe-line. In addition, point out the ultrasonic guided wave monitoring technology problems and raise the outlook.
Keywords: Ultrasonic Guided Waves; high-temperature pipe; corrosion monitor;
【PF011】All-electronic Terahertz/Millimeter wave imaging for fast and reliable NDT
Jiang Yunxi1, Torsten Loeffler2, Theo Hoyer2 and Holger Quast2
1Matrix U/E Technologies Inc.
2SynView GmbH
Abstract: Introduce the principle of fast all-electronic 3D THz FMCW imaging technology, and the application in non-destructive inspection, this technology can get a wonderful result for different composite material inspection.
Keywords: THz, FMCW, imaging, composite material, non-destructive inspection
【PF012】Qualitative and Quantitative Inspection Methods for Root Defects of Welded Joint
by the Combination of a Vertical and a Shear Wave Probes Tested by Ultrasonic Diffraction Technique for Thick Wall and Great Diameter Pipe
CHEN Hong-dong[1], XIONG Liang[1], DENG Hong-ping[2], CHEN Lin-yi [3],
(1 Hunan Electric Power Corporation Research Institute, Changsha 410007,China;2 Hunan Xiangdian Boiler & Pressure Vessel Test Center Ltd, Changsha 410007,China;3 Hunan Nan-ya Middle School, Changsha 410014,China)
Abstract: Pointed to the difficult of qualitative and quantitative testing for the welding testing of thick and great diameter pipe, a new method was put forward using the combination of a vertical and a shear wave probe. At first, the shear wave probe transmitted the ultrasonic wave to the welding root, and if there was a certain defect, it would produce the diffraction wave, and the wave would be received by the vertical probe located ant the surface welding. Analyzing the depth of the greatest amplitude diffraction wave, combining the horizontal location of shear wave probe and the characteristics of diffraction wave, the qualitative and quantitative objection would realized. The qualitative judging methods for six kinds of defects such an crack, incomplete penetration, non-fusion, welding tumor, concave and wrong side, were concluded and the classification process was described. Such introduced testing method has great application value for the welding testing of thick and great diameter pipe, especially for the welding testing which could processed on single side and single surface tube.
Key words: Ultrasonic testing; Diffraction wave; Welding of pipe; Combination probes
【PF013】Comparison between Delay and Sum Method and Back-projection Method in Photoacoustic Tomography
Dan Wu, Chao Tao, Xiaojun Liu
(Key Laboratory of Modern Acoustics,Institute of Acoustics, Nanjing University, Nanjing, 210093)
Abstract: Photoacoustic tomography has the advantages of high optical contrast and good spatial resolution, and it has been directed growing attention. Both delay and sum method and back-projection method are extensively used in photoacoustic tomography. The purpose of this study is to experimentally compare the performance of both methods. According frequency-domain analysis, a significant factor that could differentiate them is found. By establishing experiments, the results agree with the analysis: delay and sum method could provide images where the absorbers are smooth and the details with them could be clearly revealed, and the back-projection method could definitely resolve their boundaries. The results of this study could help to take suit method for reconstruction in practice.
Keywords: Photoacoustic tomography,DAS method,BP method, frequency-domain analysis
【PF014】Introduction of a New Super-Sensitive X-Ray Film
Xiao Zhiqiang1, Yang Xinmin2
1(Institute of Fluid Physics of CAEP,Mianyang of Sichuan Prov. 621900)
2(Technical Institute of Physics and Chemistry of CAS, Beijing, 100021)
Abstract: A new type of x-ray film named TX2 has been developed jointly by IFP of CAEP and TIPC of CAS. This article introduces its features and the results of photographic measurements. The measurements shows that the sensitivity>ISO1600, resolution>80 lp/mm, and its properties and qualities are very reliable. As a kind of special x-ray film, TX2 has a bright future in various applications.
Keywords: TX2, Super-Sensitive, X-ray film, Features, Properties
【PF015】Electric circuit modeling of ultrasound-excited thermo-image technique
ZHENG Jiang1, ZHENG Kai2, ZHANG Shu-yi1
1 Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University,
Nanjing 210093, People’s Republic of China
2 Jiangsu Province Special Equipment Safety Supervision Inspection Institute,
Nanjing 210003, People’s Republic of China
Abstract: Ultrasound-excited thermo-image is a new method of NDE/T technology, in which a high-power ultrasonic transducer excites high ultrasonic energy pulses into the tested sample. While the defects (e.g. cracks) exist in the sample, the propagation of wave should cause the frictional interaction of the crack area, therefore, the local temperature increases. By an IR camera monitoring this kind of local transient temperature increases, the surface and subsurface cracks in the sample can be detected. The related experiments show that, under the intensive ultrasonic excitation, the non-linear vibration phenomena, such as harmonics, sub-harmonics, quasi-sub-harmonics or chaotic, may appear in the system. The transient temperature increase of the defective area is more significant then other parts, so the detection of cracks is very sensitive.
Based on the similar principles between electric circuit systems and mechanical systems, some suitable circuit model can be used to simulate ultrasound-excited thermo-image for NDT, This paper proposes a circuit simulation model to simulate the mechanical vibro-impact motions between the transducer horn and sample in the ultrasound-excited thermo-image system. Calculations from the electric model show that the harmonic, sub-harmonic, quasi-sub-harmonic or chaotic phenomena appear in the simulation circuit, which indicate that the circuit can simulate the sample (plate) vibration in the ultrasound-excited thermo-image system. Therefore, the technique provides a new approach to study and optimize the ultrasound-excited thermo-image technique to be applied to NDT.
Keywords: ultrasound-excited thermo-image, non-linear vibration phenomena, electric circuit modeling
【PF016】Numerical Simulation and Experimental Research on Crack Magnetic Flux Leakage Field
ZHENG Mu-Lin, LIU Fu-Jun, KONG Shuai, LING Zhang-wei, QIAN Yue-Qiang, ZHAO Li-Wei, Xia Jun-Fang
(Zhejiang Provincial Special Equipment Inspection and Research Institute, Hangzhou 310020 China)
Abstract: Magnetic flux leakage (MFL) testing is widely used to inspect and characterize defects in pipelines, storage tanks and other structures. In this paper, based on the Maxwell Equations, numerical simulation and experimental research of crack magnetic flux leakage field were carried out. The three-dimensional models of cracks were established, the influence of the generalized crack parameters to the magnetostatic MFL field, including depth, width, inclination angle and crack spacing, was discussed. The relationship between defect parameters and MFL amplitude was obtained. The amplitude is significantly affected by the inclination angle. Therefore, single direction inspection may lead to undetected in practice. While the two cracks interval is less than 5 mm, the MFL fields would overlap. Furthermore, the experimental investigations were developed, and the results agree well with that of the simulation. The conclusions could provide valuable reference for inspection.
Keywords: crack magnetic flux leakage field 3-D numerical simulation
【PF017】The phenomenon of pseudo-defect caused by thermographic signal reconstruction in pulsed thermography
Kong Dejuan,Tao Ning,Zeng Zhi,He Ruigang
Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Department of Physics, Capital Normal University, Beijing, 100048 China
Abstract: In pulsed thermography nondestructive evaluation,thermographic signal reconstruction (TSR) is used to analyze and process experimental results. The method can increase the spatial and temporal resolution of the thermographic sequence, increase signal to noise ratio, and reduce the amount of data. In addition, this method can eliminate the interference of certain pseudo-defects, such as pseudo-defects caused by the reflections of pulsed flash lamp and the camera lens. However, TSR is based on the polynomial curve fitting of temperature curve in which the polynomial order and data length influence the fitting result, in some cases it may generate pseudo-defects in the infrared image. This article describes the principle of TSR, and analyzes the pseudo-defects caused by TSR based on the experimental results that the specimen surface was in a state of thermal imbalance and non-uniform surface.
Keywords: thermographic signal reconstruction,pseudo-defects,uniformity
【PF018】Eddy current inspection for wear indications within structural supports of nuclear power plant steam generator tubes
Yayao Bei, Lei Zhao, Ge Lin, Chuangkun Fang, Yuying Kong,Xiaogang Wang
(CGNPC Inspection Technology Company, Ltd., Suzhou, Jiangsu 215004)
Abstract: This paper studied the eddy current inspection for wear indications within structural supports of nuclear power plant steam generator tubes. Mainly we discussed two different kinds of wear mechanisms and the way carrying out eddy current inspection. It was found that eddy current signals wound give a good prediction for the morphology of wear, at the same time the depth, length and location of wear indication were measured.
Keywords: Steam generator (SG) tubes; Wear; Eddy current inspection; Quantify
【PF019】The research of radiographic process for main equipment of nuclear power station primary system in radiographic testing
Hua Xiong-fei, Mao Yu-fei, Zhang Tie-hui, Cao Xue-kui, Li Jin-qiang, Lin Shun
(Cgnpc Inspection Technology Corporation, Suzhou 215004 China)
Abstract: Primary system of nuclear power station is the main examination object of radio- graphic testing in PSI/ISI. Starting with radiographic process in radiographic testing, radiographic process and implementation of main equipment as steam generator (SG), reactor pressure vessel (RPV) and pressurizer (PRZ) were introduced quite systematic in primary system of nuclear power station. Radiograph special tools used in each exposure were presented also. Based on the successful experience of pre-service Inspection in Ling’ao 3, 4 # nuclear power station, foundation is laid for the PSI/ISI later.
Keywords: Primary system of nuclear power station; Radiographic testing; Steam generator; Reactor pressure vessel; Pressurizer
【PF020】Eddy Current Data Analysis on Uneven Thickness of Steam Generator Tubes
Yuying Kong, Xiaoguang Li, Ge Lin, Yayao Bei
(CGNPC Inspection Technology Company, Ltd., Suzhou, Jiangsu, 215004)
Abstract: This article studied on the feature and theoretic causes on the deformation signal in absolute channel of strip chart during eddy current inspection on steam generator tubes. Combined with CIVA simulation results, we concluded that this deformation signal was produced by uneven thickness of tube. Also we introduced the potential influence and meaning of this deformation signal.
Keywords: Steam Generator Tubes, Eddy Current, Deformation Signal, CIVA
【PF021】The Tele-visual Examination of Cleanliness on the Secondary Side of Steam Generator Tube-sheet in NPP
Jiang Li WeiRang Wu Tong Yu DongLiang Fu Juan Li
(CGNPC Inspection Technology Company, Ltd. Suzhou,Jiangsu215004)
Abstract: The variable states and granular sizes of the deposit, and the different types of foreign object are always presented on the secondary side of steam generator tube-sheet in PWR,which shall influence the operation safety of NPP. Therefore, cleaning the tube-sheet and tele-visual examination are usually used during the PSI and ISI in our NPPs.
This paper describes the methods of high pressure sludge lancing and televisual examination, and the recommended acceptable criteria of cleanliness on the secondary side of the tube-sheet.
Keywords: steam generator; tube-sheet; cleanliness;televisual examination; video-probe
【PF022】The Feasibility Study of MT Instead of PT In-service Inspection of CPR1000 Unit
Liu Jun, He Yi, Zhang Hong Xing, Wang Bin
(CGNPC INSPECTION TECHNOLOGY CO., LTD., Suzhou of Jiangsu province,215004)
Abstract: In current, the in-service inspection of CPR1000 unit is often in accordance with the technical requirements established in RSE-M code. RSE-M code requires only the girth weld between truncated cone and lower cylindrical shell should perform Magnetic particle examination. And other carbon steel surface inspections often perform penetration inspection. ASME code has provided that we can use an equivalent or a better method to carry out the
in-service inspection. This provision is very useful to in-service inspection of CPR1000 unit. This article is about The Feasibility of MT instead of PT in in-service inspection of CPR1000 unit.
Keywords: CPR1000, in-service inspection, PT, MT
【PF023】The difference between RSE-M and ASME code for the ultrasonic inspection of RPV safe end dissimilar metal welds
Lv Tianming, Liu Jinhong, Li Ming, Chen Huaidong, Xiao Xuezhu
(CGNPC inspection technology limited company, Suzhou, 215004)
Abstract: The defects, such as fatigue crack, IGSCC, etc, may be occurred in RPV safe end dissimilar metal welds during serving. So, the dissimilar metal welds should get more attention during the pre-service inspection and in-service inspection of nuclear power plant. For the further investigation of ultrasonic inspection technique and the fabrication of calibration block, reference block and defect embedded block, etc, this paper investigates the difference between RSE-M and ASME code for the ultrasonic inspection of RPV safe end dissimilar metal welds.
Keywords: RSE-M, ASME, Safe end dissimilar metal welds, Ultrasonic inspection
【PF024】Non-destructive testing for PWR NPP steam generator during Pre-service inspection
MA Guan bing WANG Xiao gang GAO Jian min
(CGNPC Inspection Technology Corporation, Suzhou 215004,China)
Abstract: Non-destructive testing (NDT) techniques for PWR steam generator during pre-service inspection are introduced, including radiographic testing (RT), ultrasonic testing(UT), eddy current testing(ET), magnetic particle testing(MT), penetrate testing(PT), visual testing(VT), etc. The range of each method, process and recording standards are also given.
Keywords: Nuclear power station, Steam generator, Non-destructive testing, Pre-service inspection
【PF025】The development of research on Non-destructive Testing Technology Reliability
MA Guan bing1 ZHANG Jun2
(1:CGNPC Inspection Technology Corporation,Suzhou 215004,China;
2:NDE Center of Wuhan University, Wuhan 430072,China)
Abstract: Research on reliability of Non-destructive testing (NDT) techniques has very important influence on improving the reliability of NDT and building the qualification system of NDT capability. In this paper, research works about reliability of NDT abroad are described, focusing on reliability parameters such as probability of detection, probability of false alarm, probability of sizing and receiver operating characteristic. Two commonly used calculating models are also given. Summarize three calculating methods about NDT reliability and compare their advantages and disadvantages; finally, engineering applications about NDT reliability are introduced.
Keywords: Non-destructive testing,Probability of detection,Reliability
【PF026】Overview of Eddy current test probe of steam generator tubes in Nuclear Power Station
Ma Qiang, Zhao Ru-xuan
(CGNPC Inspection Technology Company, Ltd., Suzhou 215004,China)
Abstract: In this paper,the structure types and performance characteristics of the eddy current testing probe of steam generator tubes in Nuclear Power Station were summed up. The manufacturing process of the probe and the design method of the probe were introduced and summarized. In addition, analyzed the various influencing fact-ors of the eddy current testing probe . Moreover, this paper outlook for the future development orientation of the eddy current testing probe.
Keywords: Steam generator;Heat exchanger tubes;Eddy current;Probe
【PF027】Investigation on Ultrasonic Inspection Technique for Fatigue Cracks in Pipes of Small Diameter
Ma Wenmin Yang Jianhua
(CGNPC Inspection Technology Company Limited, Jiangsu Suzhou, 215004)
Abstract: This paper deals with ultrasonic detection used for fatigue cracks in pipes of small diameter. Selection of probe, preparation of reference block, adjustment of sensitivity, acceptance criteria and wave form of fatigue cracks, etc. are also discussed.
Keywords: Ultrasonic detection pipes of small diameter Fatigue cracks
【PF028】Ultrasonic Testing on Fillet Welds of System ARE and System ASG in Nuclear Power Plants
Ren Jianbo 〖Shan hongbin Xiao xuezhu Sun Jiawei〗^1 〖Dang Xionghui 〗^2
(1. CGNPC Inspection Technology Co. Ltd,Suzhou 215004; 2.Shaanxi Construction Machinery Co., Ltd,Xian710032)
Abstract: Ultrasonic Testing on Fillet Welds of System ARE and System ASG is presented in this article. Due to the large curvature of the specimen and the limitation of the detection surface, the defect location and feature of ultrasonic testing are systematically analyzed.
Keywords: Nuclear Power Plants; Curvature of Specimen; Ultrasonic Testing; Inspection Location; Indication Analysis
【PF029】Design and Implementation of 3D graphics ActiveX of SG-CCTV based on OpenGL
Wang Keqing, Wang Xianbin, Lin Ge
(CGNPC Inspection Technology Company, Ltd., Suzhou, 215004)
Abstract: ActiveX control is the most important technology in developing all kinds of application procedures, and it is the framework of the procedure to communicate with other procedures. OpenGL is a powerful three- dimension graphics developing tool. The overview of OpenGL and ActiveX control is introduced, and then the method of developing an ActiveX control based on OpenGL with Visual C++ is presented. Finally the ActiveX control is applied to the Steam Generator VT Scan control system software Based on VB, and the simulation and control of three – dimension model are achieved.
Keywords: OpenGL, VC++, ActiveX
Wang Xianbin, Wang Keqing, Lin Ge, Jin Guodong
(CGNPC Inspection Technology Company, Ltd., Suzhou, 215004)
Abstract: The eddy current inspection equipment for RPV stud and nut include system of aquisition and analysis the eddy current data、electric control rack and mechanical body. These systems and equipments need the cooperation of the control systems. The control theories and functions of each part of the equipment are introduced in this article.
Keywords: Reactor pressure vessel (RPV), Stud and nut, Eddy current inspection system, Control system.
Wang Xianbin, Lin Ge, Wang Keqing, Jin Guodong
(CGNPC Inspection Technology Company, Ltd., Suzhou, 215004)
Abstract: The eddy current inspection system for steam generator heat-exchanger tube (TESAR) include system of acquisition and analysis the eddy current data、system of probe push-pull、system of crawling robot and system of data transferring. These systems and equipments need the cooperation of the control systems. The control theories and functions of each part of TESAR are introduced in this article.
Keywords: System generator, eddy current inspection system, control system
【PF032】Video inspection technology applied research in nuclear power plants
Wu Gang, Zhao Lei
Abstract: The video inspection has been widely used in PSI and ISI, as a visualized, accurate and reliability technology. The video inspection is based on the reflected light signal of the surface, so the key point of the technology is the application of light illumination.
The accuracy and validity is determined by the correct using of light. This paper introduce the measures of improving the video image quality based on the analyzing influencing factor, and proved the correctness and feasibility of the measures by the experiment.
The measures can be used as the guidelines in designing, purchasing and application of nuclear station in the future. The paper also shows the research orientation of the video inspection for the nuclear power plant.
Keywords: nuclear plant, video inspection, image quality, effectiveness
【PF033】IR Thermography Inspection of Wind Turbine Blades
YUE Da-hao1, LI Xiao-li2, ZHANG Hao-jun3, LI Ye-shu4, FENG Li-chun5, WU Nai-ming1
(1. Laboratory of Modern Testing; Beijing Aeronautics and Astronautics University, Beijing 100191; China)
(2. Beijing Waiteksin Advanced Technology Co. Ltd; Beijing 100083, China)
(3. Goldwind Science and Creation Windpower Equipment Co., Beijing, 100176, China)
(4. Sinomatech Wind Power Blade Co., Ltd., Beijing, 102101, China)
(5.Dept of Physics, Capital Normal University, Beijing 100037, China)
Abstract: Wind turbine blade is one of the most important parts in wind power. With the raise of the wind generator power, wind blades are becoming larger and larger, and their reliability requirements increase accordingly. But there are no mature NDT methods to inspect wind turbines both at home and abroad. This study inspected some typical defects generated in the manufacturing using infrared thermograhpy, and showed some preliminary results. As a large, rapid, non-contact non-destructive testing technology, the IR thermography has some advantages and wide application prospects.
Keywords: IR thermography, flash lamp pulse, wind turbine blades, inspection
【PF034】The research of ET inspection technology for expanded tube in the steam generator
Zhao Lei, Wang Xiaogang, Bei Yayao, Song Tao, Kong Yuying, Wang Keqing
(CGNPC Inspection Technology Corporation, Suzhou 215004, China)
Abstract: The technology of profile curve which based on eddy current used for measuring the expanded tube has been recognized by many countries and applied to practice. But it is short to research the technology in the practical application in China. In this paper, we describe the basic principles of profile curve, and introduce how to evaluate the quality of the expanded tube with it. According to the result, we can predict the fatigue damage and the stress concentration of the tube. It lays a foundation of force analysis for the expand tubes in the manufacture or operation phase.
Keywords: nuclear Power Station, the tube of steam generator, expanded tube, eddy current
【PF037】Design of new experimental system for eddy current testing
Fan Mengbao1, Yang Xuefeng1, Cao Binghua2
1. College of Mechanical and Electrical Engineering, China University of Mining and Technology.
2. College of Information and Electrical Engineering, China University of Mining and Technology, Xuzhou, 221116, China
Abstract: Currently, nearly all the eddy current testing instruments available could not be used to verify the simulation model of probe response. To overcome the problem, a novel design of the experimental setup is presented. The experimental system, firstly, is outlined in the form of schematic diagram, and then the principle of phase-sensitive detector is investigated. Subsequently, new idea is proposed that a sampling resistor is connected in series with the probe coil. By measuring the amplitude and phase of the voltage signal from the sampling resistor, the coil impedance change could be obtained. The following theoretical analysis is done to proof the new idea. Although the presented experimental setup has the structure similar to the systems available, it could be easily used to validate the calculated model of coil impedance for eddy current nondestructive testing.
Keywords: Eddy current testing; Experimental system; Impedance
Li Xufeng
Guangdong Special Equipment Inspection Institute
Abstract: The suspected defect which was founded by reviewed X-ray films of Cool Box, Which was explained by a series other method and testing, confirmed by grinding, and removed the defect at last..
Keywords: cool Box, imported equipment, defect treatment
【PF039】Discussion on phase array ultrasonic testing(PAUT) for finned water wall tube
Zhang Huade, Chen Shuangquan, Yan Hai, Wang Wei
Suzhou Nuclear Power Research Institute, Suzhou, Jiangsu Province 215004
Abstract: For a long time past we have dealt with the ultrasonic nondestructive testing (UNDT) via small diameter tube method, which has got several shortcomings. Such as low detecting rates, too much noise, difficult too identify the wounds, and rigid requirements for the test engineers. The phase array ultrasonic testing (PAUT) is a new UNDT method which is developed in recent years. The PAUT method has got some significant advantages ,such as high detectable rate, visualized display and highly proficient in testing. When equipped with modern CAD tools and simulation softwares, the optimal testing plans can be worked out very efficiently. In this paper, we firstly discuss the conventional small diameter tube methods in tests for water wall tube. Then we majorly discussed the feasibility and superiority of PAUT working for water wall tube, and we also listed the computed simulation results which confirm our ideas.
Keywords: finned water wall tube, small diameter tube, phase array ultrasonic testing, CIVA Simulation
【PF040】Pulsed Eddy Current Technique in Ferromagnetic Tubes Corrosion Under Insulation Measurement
Kang Xiaowei, Fu Yuewen
Key Lab of Nondestructive Testing (Ministry of Education), Nanchang Hangkong University, Nanchang 330063, China
Abstract: In this paper, we applied pulsed eddy current (PEC) inspection technology to detect ferromagnetic tubes corrosion under insulation. By detecting corrosion of different thickness insulation and different defect areas and deepness, variation of detection sensitivity was analyzed. It was proved that as for corrosion defect with a large area, pulsed eddy current had a very good ability in testing under appropriate inspection parameters, even with a thick insulation.
Keywords: pulsed eddy current, insulation, ferromagnetic, tubes
【PF041】Study of pulsed eddy current array imaging detection
Lai Sheng, Fu Yuewen
(Key Laboratory of Nondestructive Testing, Ministry of Education, Nanchang Hangkong University, Nanchang 330063, China)
Abstract: It is difficult to detect flaw buried in the multi-riveted structure of aircraft. This paper designed a pulsed eddy current testing system, including the linear array probes and imaging system. The riveted aluminum alloy sample fabricated with both inner crack and corrosion was tested by the proposed system, and an imaging scan was achieved by the way of time slice applied in getting eigenvalue matrix from characteristic signal. The results of experimentation showed that the use of time slice analysis method can be efficiently used to detect subsurface and inner defects in multi-layer structure.
Keywords: Pulsed eddy current; Array; Time slice; imaging
【PF042】Distribution Reconstruction of 3D Magnetic Charge of Double Layer Structure
Li Hongmei1, 2, Li Yongfei1, Chen Zhenmao1, Li Yong1
1. MOE Key Laboratory for Strength and Vibration, Xi’an Jiaotong University, Xi’an 710049;
2. Department of Mechanical and Electrical Engineering, Ningxia Vocational and Technical College, Yinchuan 750002
Abstract: In order to further explore the reconstruction algorithm of three-dimensional natural magnetization, the profile reconstruction of a simplified three-dimensional distribution, double layer structure, was studied in this paper. Magnetization reconstruction scheme was developed based on the concept of magnetic charge and the optimization algorithm of steepest descent method to cope with the ill-pose state of this typical inverse problem. In practice, a system of linear equations linking the magnetic charges of double layer structure with the corresponding leakage magnetic field was deduced at first. An initial value assignment method was developed to regularize the ill-posed inverse problem for magnetic charge reconstruction. Several magnetic charges distributions of double layer structure were reconstructed with the proposed method. The numerical results show that the method is effective for the reconstruction of magnetic charge in double layer structure.
Keywords: magnetic charge reconstruction, double layer structure, damage evaluation
【PF044】Study of High Precision Digital Eddy Current Testing System
Lin Fabing, Lin Chunjing, Lin Junming, Li Hanlin
(Eddysun (Xiamen) Electronic Co. Ltd., Xiamen, 361008)
Abstract: The detecting precision is more concerned for a digital eddy current non-destructive testing equipments. By adopting some advanced techniques, high precision could be reached for a digital eddy current system. This paper describes the principle, configuration and application of the new type digital eddy current testing system. The system is able to find slight defects in in-service parts, of which the eddy current signal is usually weak.
Keywords: Eddy-Current, Digital, Precision, Resolution.
【PF045】The reason of steel structure crack and MT(dry)
Liu Jinping Li Hao【1】 Bao Qian【2】
(Nanjing HuaJian Testing Co., Raohua Gate, Nanjing 210046 )
【1】(Suizhou, Hubei Province 441300)
【2】(LianYungang, Jiangsu Province 222513)
Abstract: This paper intends to recognize the reason of steel structure cracking, analyzing from steel structure’s welding method(SAW, FCAW, SMAW) and some weld seam of different position’s testing by MT, known defect’s causing have relation of welding method, welding position, welding procedure conditions, welding stress, assembly and so on. So it should know the reason which caused the defect’s and position before establishing WPS.
Keywords: steel structure, crack detection by MT
【PF046】Application management of weld ultrasonic testing data
Liu Jinping Hu Binding
(Nanjing Huajian Industrial Equipment Installation Testing & Calibration Co., Ltd., Subsidiary of China Construction Industrial Equipment Installation Co., Ltd., Nanjing, 210046)
Abstract: In order to understand the way the general contractor deals with the welding quality and the ultrasonic testing data between the Owner and the specialized construction contractors, and by analysis of the ultrasonic testing data of the American San Francisco New Bay Steel Structure Bridge project, we learn that it needs a professional perspective to look into the ultrasonic testing data to reflect the welding quality. In conclusion, the professional technical management is essential to both the welding quality and the ultrasonic testing data so as to achieve the goal of benefit and quality safety.
Keywords: quality assurance, ultrasonic testing, data evaluation, unification
【PF047】Measurement and Reconstruction of Tiny Magnetic Field for Bearing Wearing Evaluation
Xiaowei Wang , Tianyan Liu, Yongbin Zuo, Zhenmao Chen, Yong Li
(MOE Key Laboratory for Strength and Vibration, Xi’an Jiaotong University, 28 West Xianning Road, Xi’an 710049)
Abstract: The feasibility to evaluate wearing status of the bearing system by using the Superconducting Quantum Interference Device (SQUID) magnetometer is studied in this paper. To predict the status of the ferromagnetic particles in bearing oil from the magnetic field signals measured by SQUID, a scheme is also proposed and validated to reconstruct the distribution of magnetization in oil pipe from the measured signals. The experimental results verified that the SQUID is very efficient for the measurement of micro-magnetic field due to magnetic particles, and its signal amplitudes have clear correlation with the amount of the particles. In addition, the numerical results reveal that the proposed inverse analysis scheme and the developed code are applicable for the reconstruction of the distribution of magnetic particles. For magnetic signals even with 20% noise, the magnetization information inside a pipe can be properly reconstructed.
Keywords: Bearing wear, Micro-magnetic field, Magnetization reconstruction, Inverse analysis
【PF048】Development of Palmtop Multifrequency Eddy-Current detector
Yang Hongcheng, Wang Wei, Lin Fabing, Lin Chunjing, Lin Junming
Eddysun (Xiamen) Electronic Co. Ltd.,Xiamen,361008
Abstract: The basic development principle of palmtop Multi-frequency Eddy-Current detector was introduced. Based on the principle, the detector system was designed by using high performance microprocessor S3C2440. And the design method of hardware and software were explained.
Keywords: Eddy-Current, Multi-frequency.
【PF049】Extraction flaws outlines of inner surface of charge engine
Yuan Lihua,Wu Guanhua,Wu Wei,Li Ming
Key Laboratory of Nondestructive Test (Ministry of Education), Nanchang Hangkong University, Nanchang 330063, China
Abstract: The method that combined Canny operator with Otsu method was discussed to extract image outlines, and the realization steps of the method were presented. It was effective that the outlines of defect which was on double backgrounds were extracted by Canny operator based on double thresholds determined by Otsu method. The false contour was eliminated so that the clear outlines could be nearly completely obtained. The method successfully extracted the flaws outlines of inner surface of charge engine. The results showed that the edge detection of lighting asymmetry image such as endoscope image could be processed well by the presented method.
Keywords: Edge detection, Threshold segmentation, Surface defects, Canny operator, Otsu method
【PF050】A new nondestructive detection method based on EMAT for detecting natural gas pipes
(Lab of Modern Acoustics, Institute of Acoustics, Nanjing University
Nanjing 210093, China)
Abstract: With the increasing pressure of natural gas, the quality requirements of the transmission pipes for natural gas are also improved. Any defects in the pipe can cause serious accidents and heavy impacts on production safeties and economic benefits. So defect detection is extremely important for natural gas pipelines. However, traditional ultrasonic method is limited to detect the flaw of natural gas pipe, because of several problems, such as the coupling of ultrasonic waves, cannot be overcome easily.
This paper describes a new detection method of natural gas pipelines based on electromagnetic acoustic transducer (EMAT). Compared with traditional piezoelectric transducers, the ultrasonic wave generated and detected by the EMAT is noncontact to the pipe instead of contact to the pipe through a coupling medium. Meanwhile, a new kind of EMAT sensor and corresponding circuit, as well as the related processing method of ultrasonic echo waves are used to detect the ultrasonic wave. The characteristics of different kinds of defects and corresponding effects on the detection results are analyzed. A high sensitivity receiving transducer is used to improve the detection sensitivity. The results show that the new detection method is effective for defect detection of natural gas pipelines.
Keywords: EMAT, nondestructive detection, natural gas pipeline
【PF051】Ultrasonic Thickness Accurate Measurement of Fire Resistant Door in Service Inspection
Dai Yonghong, Li Hanlin, Yang Hongcheng, Zhao Jincheng, Lin Junming
Eddysun (Xiamen) Electronic Co. Ltd., Xiamen Fujian, 361000
Abstract: Fire resistant door testing should be done in fire control examines. Vernier calipers are not able to be used for quick non-destructive testing of the steel plate. Portable accurate Ultrasonic Testing instrument is designed for Thickness Measurement. With narrow pulse high frequency probe, testing range of the instrument is from 0.2 mm to 1000mm, and precision is 0.004mm. Practice in examines proves that quick non-destructive testing of the steel plate thickness can be carried out with the instrument
Keywords: Fire resistant door, Ultrasonic Testing, Steel Plate, Thickness
【PF052】Immersed Ultrasonic Methods for Conduit Tubes of ITER Superconducting Cables
Yongbin Zuo, Yunfei Li, Zhenmao Chen, Yong Li
(MOE Key Laboratory for Strength and Vibration, Xi’an Jiaotong University
28 West Xianning Road, Xi’an 710049)
Abstract: The Poloidal Field (PF) coils in ITER Tokamak device require a lot of superconducting Cables in Conduit Conductors (CICC). Conduit tube is an important part of the CICC as it is the container of cooling liquid Helium and supporting structure of the electromagnetic load. To ensure the safety of the PF coil, Non-Destructive Testing (NDT) has to be performed for each conduit tube of CICC, However, the complicated cross section shape of the PF conduit tube causes difficulty in its NDT for conventional methods. Aiming at solving the NDT problem of the PF conduit tube, an approach is proposed and its validity is demonstrated in this paper. The approach is of the immersed ultrasonic testing method using single focus transducer or phased array probe. The experimental results reveal that the approach is promising for the NDT of the ITER conduit tubes.
Keywords: Non-destructive Testing, Tokamak, Cable in Conduit Conductor,Immersed
【PF053】The Calculation and Detection of Impact Damage in Carbon Fiber Reinforced Composites by ANSYS and Ultrasonic C-scan
He Xiao-yu1, Wang Dan2, Wu Guan-hua2, Ao Bo2, Yang Xiao-lin3
1. Changhe Aircraft Industries Group limited Corporation, Jingdezhen 333002, China
2. Key Laboratory of Nondestructive Test (Ministry of Education), Nanchang Hangkong University, Nanchang 330063, China
3. The First Aeronautic Institute of Air Force, Xinyang 464000, China;
Abstract: In the paper, explicit finite element method, three-dimensional Tsai-Wu failure criterion and material stiffness criteria for conversion were used to simulate the impact damage process of the rectangular laminates T300/QY8911, and predict the extend of impact damage. According to the standards of “the general technical specifications of HB72242-95 composite structures” and “the general specification of GJB28952-97 carbon fiber composite laminates”, the impact specimens were designed, and low-energy impact experiments were carried out. The ultrasonic C scan was used to detect the damages of different impact energy, and compared with the results of finite element method. It shows that the results of finite element simulation are consistent with those of the ultrasonic C scan test on the size of damage areas. Three-dimensional Tsai-Wu failure criterion for damage and material stiffness criteria for conversion are also proved by the experiment results. When the energy reaches more than 4.5 J, the delamination of impact damage can be detected by the ultrasonic C scan testing.
Keywords: carbon fiber reinforced composite; finite element simulation; impact damage; ultrasonic C scan
【PF054】Ultrasonic attenuation characteristics of C/C composite during three-point bending test
Li Ze1, Ni Jin-hua2, Ao Bo2, Wang Chan1, Guan Wen-xiu2
1. AVIC Xi’an Aero-engine (group) Ltd., Xi’an, China
2. Key Laboratory of Nondestructive Testing, Ministry of Education, Nanchang Hangkong University, Nanchang, 330036, China
Abstract: In this paper, standard samples of Carbon/Carbon composite are designed and manufactured in accordance with the standard of “QJ 2099-1991 three-fiber reinforced composite test methods for flexural properties”. Ultrasonic attenuation is used to research characteristics of ultrasonic attenuation in different stages of damage during three-point bending test, the frequency of probe is 2MHz. Research results shows that ultrasonic attenuation is corresponding to the damage of three-point bending, ultrasonic attenuation is suitable for inspection of C/C composite material.
Keywords: Carbon/Carbon composite; three-point bending test; ultrasonic attenuation; damage
【PF055】AE monitoring of C/C composite during three-point bending test
Wang chan1, Ni Jing-hua2, Ao Bo2, Li Ze1, Li Jia2
1. AVIC Xi’an Aero-engine (group) LTD. Xi’an, China
2. Key Laboratory of Nondestructive Testing, Ministry of Education, Nanchang Hangkong University, Nanchang, 330063, China
Abstract: Standard samples of Carbon/Carbon composite are manufactured in accordance with the 《Three-fiber reinforced composite test methods for flexural properties》, characteristics of acoustic emission signal are researched under different load of three-point bending test of Carbon/Carbon composites. In the initial damage stage of Carbon/Carbon composites bending test, the amplitude of acoustic emission signal is generally low, only a few high amplitude signals, and the acoustic emission events is relative less and tends to steady, the released average energy is small. In the stage of crack initiation and stable growth, the amplitude of acoustic emission signal increases gradually, and the acoustic emission events has paroxysmal increase. In the stage of instability fracture, lots of high amplitude signals arise, and the acoustic emission events has no obvious change compared with the second stage, but has obvious mutation in the later stage, the energy released by acoustic source has once obvious paroxysmal increase, and the energy is very high. The result shows that the damage of Carbon/Carbon composite can be characterized by amplitude and acoustic emission events.
Keywords: Carbon/Carbon composite; three-point bending test; Acoustic emission; damage detection
【PF056】A Comparative Analysis of CR and RT in Aluminium Alloy Welding inspection
Wang Fu-xi1, Liu Li-liang2, Ao Bo2, Jin Xin-hong2
1 Luoyang Ship Material Research Institute, Luoyang 471039, China
2 Key Laboratory of Nondestructive Test (Ministry of Education), Nanchang Hangkong University, Nanchang 330063, China
Abstract: This paper focuses on the inspection of butt weld of aluminum alloy plates. We study X-ray Computed Radiography (CR) inspection technology of butt weld by the 35NDT industry scanner which is produced by Duerr Corp, and compared CR with Radiographic Testing(RT). The results show that the inspection technology of CR for weld inspection is the same as RT, and the exposure is reduced by 30%-60% the sensitivity of the CR can achieve the sensitivity of RT. The quality of the image is close to negative image quality.
Keywords: Butt weld; CR; Imaging Plates; Exposure; Image
【PF057】Measuring relationship between ultrasonic velocity and organizational structure of High-Chromium cast iron
Wu Ya-hua1, Tang Jia2, Wang Fu-xi 3, Wu Guan-hua2,Zhu Kai3
(1.JiuJiang University. JiuJiang, 332005,China, 2.Key Laboratory of Nondestructive Testing, Ministry of Education, Nanchang Hangkong University, Nanchang, 330063, China)
Abstract: The organizational structure of high-chromium cast iron were changed by heat treatment, ultrasonic evaluation of the organizational structure are researched under three ways of ultrasonic velocity, spectrum analysis, energy spectrum analysis, and established the ultrasonic evaluation model of the organizational structure in high-chromium cast iron. The experiment results indicated that at the same quenching but different cooling rate, the martensite in the test parts under air cooling is maximum, so the speed of sound is also least., however that under furnace cooling shows the speed of sound is also fastest since the martensite is smallest. If increasing solution temperature, the amount of martensite were increased at first and then decreased, corresponding the ultrasonic velocity was reducing first and then increasing. The velocity of annealed samples is smaller than the test parts without tempering, the consequent is caused by the changes in elastic modulus.
Keywords: Ultrasonic testing; High-chromium cast iron; Microstructure; velocity
【PF058】The research on different excitation of MBN for stress measurement
DING Song1,3, TIAN Gui-yun1,2 ,WANG Ping1, WANG Hai-tao1
(1.College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, 210016;
2. School of Electrical, Electronic and Computer Engineering, Merz Court, University of Newcastle upon Tyne, Newcastle, NE1 7RU, UK;
3. College of Automation and Electrical Engineering, Nanjing University of Technology, Nanjing, Jiangsu, 210009)
Keywords: Barkhausen noise, stress detection, excitation parameters
Abstract: Barkhausen effect is the basic of the detection of micro-structure and stress. The features of Barkhausen noise is shown in this paper, under the excitation with different voltage, frequency and wave. While testing the sample, the effect on Barkhausen noise of stress due to the parameters of excitation is studied and the explaination in Microscopic field is discussed.
【PF059】Research on Estimating the Rail Magnetizing Time in NDE
Jia Xiaoyuan1 Wang Haitao1 Wang Ping1 Tian Guiyun1, 2, Ding Song1 Yan Xiaoming1
(1College of Automation Engineering, Nanjing University of Aeronautics and Astronautics,
Nanjing 210016,China
2 College of Electrical, Electronic and Computer Engineering, University of Newcastle, England)
Abstract: when using the magnetic flux leakage technology tests the rail flaws in high speed, because of the speed effect, eddy current and hysteresis effect are inevitable produced. This article focuses on the latter, and starts from the mechanism of the rail magnetization. Barkhausen noise (MBN) method reflecting the mechanism is used to studying hysteresis effect, and experimental methods are used to estimate the magnetizing time and analysis the excitation voltage to the rail magnetization effect. Finally, the experiment to verify the results is made at the high-speed magnetic flux leakage platform. It shows the size of the magnetic yoke directly impacts on the shape and size of the defect magnetic field signal. The larger of the yoke size, the longer time of the rail magnetized. The magnetization state of the rail is close to the magnetic saturation, and it is better for the rail defect detection.
Keywords: rail,MFL,magnetizing time,Barkhausen
【PF060】Neutron Reflectometry and Its Application in Corrosion Science
Abstract: Neutron reflectometry(NR)is one kind of advanced technique for characterizing thin films and interfaces. Due to its unique properties, NR can plays very important roles in many research fields, including industry related research fields such as interface corrosion and oxidation. In this paper, the neutron reflectometry technique is briefly introduced. Its application in the corrosion science is reviewed.
Keywords: Neutron reflectometry, Corrosion, In-situ Investigation
【PF061】The simulation and research of defect detection based onEddy Detection Technology at high speed
Jie Liu1, Ping Wang1, Guiyun Tian1, 2 , Theodoros Theodoulid 3
1 School of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016
2 Newcastle University upon Tyne, UK
3 Technological Educational Institute of West
Abstract: The velocity effect of MFL inspection under high speed will induce the distortion in the detection signal. According to the basic principle of velocity effect on MFL inspection, we know that eddy current induced by velocity is one of the factors which influence the MFL signal directly and the size of eddy current is proportional to velocity and magnetic field intensity. In this paper, a new approach termed as eddy current testing for defects detection and characterization is proposed which provides a new method and ideas for high speed inspection. And the availability of the new method is shown by finite element analysis and experimental results.
Keywords: Eddy current; Velocity effect; Finite element
【PF062】The research of outdoor temperature changes’ effect on stress measurement by Barkhausen
Yan Xiao-ming1, Wang Ping1, Tian Gui-yun1, 2, Jia Xiao-yuan1, Zhu Qiu-jun1
1. College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2. College of Electrical, Electronic and Computer Engineering, University of Newcastle, England
Abstract: Exposed outside yearly, the rail’s temperature will be very different with climate change in seasons, resulting in thermal stress. In the using of Barkhausen noise (MBN) detection to test the thermal stress, the temperature’s change have effects on the stress and the MBN itself, both of the two factors have caused changes in MBN signal. To extract the information which reflects the stress change, this paper introduces the design of MBN detection system. To guarantee the constant stress and temperature changes, we test the MBN signals in the laboratory and discuss the relationship between the features and changing temperature, the same as stress. It is found that, within the elastic range in the sample, MBN average, RMS, counts, peak, peak-width ratio decreases with the increase of temperature. However, the rate of change is different. Finally, we found out the features which have smaller changes with temperature changes and bigger changes with stress changes. We explain the phenomenon which temperature change have effect on the rail stress from the theory and analyze the impact of the residual stress, uneven distribution of temperature in the testing.
Keywords: Barkhausen Noise, temperature, stress, feature
【PF063】Investigation of Wireless Sensor Networks for Structural Health Monitoring
Jie Liu1, Ping Wang1
1 School of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016
Abstract: Wireless Sensor Networks (WSN) is one of enable technologies in the structural health monitoring (SHM). Through intelligent, self-organizing means, it will test a variety of different objects and different working principle of the sensor nodes connected into a network and integration with data processing functions. In this paper the key issues of WSN applied in SHM are discussed, including integration of different types of sensors with different operational modalities and sampling frequencies, issues of transmission bandwidth and real-time ability, the wireless transmitter frequency, topology, and data fusion and integration, energy saving and self-powering. In FP7 project “Health Monitoring of Offshore Wind Farms” Project, the above issues are explored.
Keywords: WSN, SHM, Sensor Network,
【PF064】The Acoustic Emission Testing about the Pressure Shell of Large Structurein Hydraulic Pressure Experiment
Yao Li
Mianyang, Sichuan, China Airedynamic Research and Development Center, 621000
Abstract: Aim at the hydraulic pressure experiment of the primary entering air pipeline of large structure, Refer to the interrelated request of standard of GB/T18182-2000, the structure integrity evaluation and alive level monitor of a flaw are carry on in this paper, some result with engineering meaning is made out.
Keywords: Acoustic Emission Testing; Hydraulic Pressure Experiment;Pressure Shell;Evaluation
【PF065】A rail temperature stress detection system of Barkhausen noise based on BP neural network
Abstract: Due to both of the temperature and stress have affecting MBN signals, in the detection process of the rail temperature stress, so how to get the accurate stress value by temperature compensating for the test stress is a emphasis of this study. A temperature stress detection system of Barkhausen noise which is based on the BP neural network has been built by taking the temperature of the ferromagnetic specimens, the frequency and voltage of the excitation signal, and the mean value, RMS value, ringing counts and peak-wide ratio of the processed Barkhausen signal as the main impact factor, and taking the corresponding compressive stress of specimen as the output data. After being trained by many training samples, the network was tested by some test samples. It is shown that the required accuracy is reached by comparing the test results with the actual stress value, which indicates that the stress detection system of Barkhausen noise based on BP neural network has obtained the perfect temperature compensation, and is very effective and accurate.
Keywords: Barkhausen noise; BP neural network; compressive stress; temperature
【PF066】Digital Image Correlation Based on Harris Corner Detection and Matching
Xiaoxiang Mao, Yuepeng Tian, Lijuan Hao
Department of Automation, Nanjing University of Aeronautics and Astronautics
Abstract: To solve the problem of small rotation with digital image correlation (DIC), a method based on Harris corner detection and matching is presented. This method detect the corner by Harris corner detection algorithm, matching it based on similarity, then six affine transform parameters are estimated by RANSAC algorithm , the initial guess of Newton-Raphson is obtained ,then use it to obtain the displacement and strain. The simulation results show that: this method has high accuracy and fast characteristics, is applied for the case of small rotation.
Keywords: Harris; RANSAC; affine transform; similarity
【PF068】A new kind of Acoustic Sensors with Wide-band
(Lab of Modern Acoustics, Institute of Acoustics, Nanjing University
Nanjing 210093, China)
Abstract: In Acoustic Emission (AE) testing, the sensors are key components for accessing information. There are two main shortcomings of AE sensors currently in uses: First, most AE sensors have narrow-bands, which are suitable for analysis of AE parameters, but restricted for AE waveform analysis. Second, these sensors mainly need to be installed on a contact interface with coupling medium, which may be subject to environmental restriction, and are easily subject to kinds of vibrating disturbances.
This paper presents a new kind of AE sensors with high sensitivity and wide-band. A PZT or PVDF film is used as piezoelectric element, and optimized coupling materials and structures in front of the piezoelectric element is employed to improve the sensitivity and bandwidth of the sensor. According to different measurement requirements, the sensor can be installed in a noncontact way near and pointing to an object through air, or in a contact way on the surface of the object, to receive the acoustic emission signals. The effects of the parameters of the front coupling structures on the sensitivity of the sensor are analyzed. The sensitivity and bandwidth of the sensor in both noncontact and contact ways are measured with a point-frequency method using air ultrasonic transducer and a sweep method using laser ultrasound. The results show that, the sensor has a simple structure, and better sensitivity, wide frequency band, and wide range of applications, compared to conventional AE sensors.
Keywords: nondestructive testing, acoustic emission, noncontact detection
【PF069】Experimental Research on Metal Magnetic Memory Method to Test Buried Defect
Li Yuntao1, Qiang Tianpeng2, Zheng Kai2, Ma Xiangdong2
(1China Special Equipment Inspection and Research Institute, Beijing, 100013; 2Jiangsu Provincial Special Equipment Safety Supervision Inspection Institute, Nanjing, 210003)
Abstract: In order to know the feasibility of Metal Magnetic Memory Method to test the buried defect, a long and narrow groove made from the HP345-based cylinder body inner wall was studied, the change of Self Magnetic Leakage Field normal component curves with loads analyzed, the method to distinguish the true defect signal from the false one given, the minimum load under which the distinguishable abrupt defect signal appeared at the defect found out, the curves of the abrupt defect signal’s peak-to-peak values and the maximum gradients with loads classified into 3 stages, and “Contrast Testing” thought was given for the newly-built cylinder.
Keywords: Metal Magnetic Memory Method, Cylinder, Buried Defect, Self Magnetic Leakage Field (SMLF), Contrast Testing Method.
【PF070】Signal extraction and error analysis of fiber-optic strain measurement system based on low-coherent interference
LI Erfei, ZHU Yongkai, CHEN Shengpiao, LIN Xiaoming
(College of Automation, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016)
Abstract: There’s a broad development prospect of applications of fiber-optic strain measurement technology used in structural health monitoring of materials. A low-coherent fiber-optic strain measurement system based on Michelson interferometer was designed in this paper. Strain of a steel plate with optical fiber attached was successfully measured through collecting luminous intensity information of light before and after the application of stress. Background noises were reduced greatly by the use of average filtering and wavelet transform and trough of interference fringes was located accurately by the use of envelope detection; all of these were employed to realize an effective extraction of original signals. The results showed that linearity and repeatability of the system was 0.55% and 0.95%, respectively. Finally, optical and circuit noises and error sources were analyzed, some improvement approaches were proposed.
Keywords: fiber-optic low-coherence; wavelet transform; envelope detection; error analysis
【PF071】The application of acoustic emission location combined with optical technology in composites’ damage detection
Lin Xiaoming, Zhu Yongkai, Pan Renqian, Li Erfei
(College of Automation, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, 210016)
Abstract: Acoustic emission can be well used in composites’ damage detection because it is sensitive to the defect’s generation and expansion, and damage location is the key aspect of this technology. This paper designs and constructs an acoustic emission detection system combined with optical technology, identifies the location of damage sources and measures the group velocity of Lamb wave in composites sheets. The distributed optical fiber sensors were arranged on the top of composites based on triangulation principle to detect damage signals. Then, Daubechies10 wavelet and Gabor wavelet were used to de-nosing and acquire signal peak to obtain the propagation time of Lamb wave. Finally, the damage location and group velocity of Lamb were obtained by solving a set of non-linear equations established by the time of arrivals based on triangulation. Compared to other methods, this method has the advantage of non-contact and does not need measure material parameters, thus it is a significant method in composites’ damage detection.
Keywords: Acoustic emission; Sensor array; Composites; Group velocity