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Observation of the Impact of Defect on Wedge Waves by Laser Ultrasound Technique 激光超声技术观察缺陷对楔形波的影响
2018 IEEE Far East NDT New Technology & Application Forum (FENDT) Pub Date : 2018-07-01 DOI: 10.1109/FENDT.2018.8681955
J. Jia, Xueping Jiang, Q. Han
{"title":"Observation of the Impact of Defect on Wedge Waves by Laser Ultrasound Technique","authors":"J. Jia, Xueping Jiang, Q. Han","doi":"10.1109/FENDT.2018.8681955","DOIUrl":"https://doi.org/10.1109/FENDT.2018.8681955","url":null,"abstract":"The research focuses on measuring the influence of defect on wedge waves by using laser ultrasound technique. The wedge waveguide models with defect and different angles were built and calculated by using finite element method. Both reflected and transmitted waves are observed. Meanwhile, angle has the greatest influence on the low-order wedge wave mode, and there is low order reflected wave and transmitted wave modes separate from high order mode. By integrating the power spectra of the wedge waves, the energy distribution of these wedge waves of 20°, 30°, 45° and 60° wedge are analyzed, and the location of defect is determined. The results of this study can provide theoretical guidance for the positioning and size estimation of wedge defects.","PeriodicalId":113185,"journal":{"name":"2018 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132336098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Research on Optimized Algorithm of Phased Array Ultrasonic Detection for Wheel Rim Defects 相控阵超声检测轮辋缺陷的优化算法研究
2018 IEEE Far East NDT New Technology & Application Forum (FENDT) Pub Date : 2018-07-01 DOI: 10.1109/FENDT.2018.8681958
Wei Huang, Xiaorong Gao, Jian-qiang Guo
{"title":"Research on Optimized Algorithm of Phased Array Ultrasonic Detection for Wheel Rim Defects","authors":"Wei Huang, Xiaorong Gao, Jian-qiang Guo","doi":"10.1109/FENDT.2018.8681958","DOIUrl":"https://doi.org/10.1109/FENDT.2018.8681958","url":null,"abstract":"The wheel rim is an important part of the locomotive operation which carries the weight of entire train. The conventional phased array inspection method for wheel rim is poor efficiency and has poor resolution for some special angle defects. Therefore, in this paper, a frequency domain synthetic aperture algorithm based on virtual source technology is proposed to solve problems mentioned above. First, the focus of phased array is focused as arc inside the wheel rim forming many virtual sources. Then, high-resolution lines are synthesized used the delay rule with the A-scan data. Finally, the B scan is drawn based on the phase shift migration method in cylindrical coordinates. Through simulation and experiment, the results could show that the optimization algorithm proposed in this paper makes full use of the beam deflection and focusing of the phased array which improves the quality of the image, improves the detection ability of the far field, and increases the detection resolution of special angles. The algorithm could efficiently reduce the time of the imaging taking the speed advantage of the frequency domain imaging.","PeriodicalId":113185,"journal":{"name":"2018 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127685751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Transfer Matrix Method for Natural Frequency Analysis of a Sandwich Transducer 夹层换能器固有频率分析的传递矩阵法
2018 IEEE Far East NDT New Technology & Application Forum (FENDT) Pub Date : 2018-07-01 DOI: 10.1109/FENDT.2018.8681986
Shu-peng Zhai, D. Xiao, Ming Cheng, Chunguang Xu
{"title":"Transfer Matrix Method for Natural Frequency Analysis of a Sandwich Transducer","authors":"Shu-peng Zhai, D. Xiao, Ming Cheng, Chunguang Xu","doi":"10.1109/FENDT.2018.8681986","DOIUrl":"https://doi.org/10.1109/FENDT.2018.8681986","url":null,"abstract":"In this paper, the transfer matrix method is studied to achieve a fast and accurate analysis of the natural frequency of a sandwich transducer. Although a sandwich transducer gets its structural parameters based on the half-wavelength theory, there is no easy way to verify its natural frequency, which may cause the transducer to work less efficiently. Firstly, the continuous elastic body became a multi-degree-of-freedom system consisting of a plurality of massless spring sections and mass-concentrated blocks after equivalence and discretization. Secondly, the system's natural frequency was obtained after deriving the system matrix. Finally, it was compared with the results obtained by the finite element method and the pulse excitation method. It is proved that the transfer matrix method can be used to analyze the natural frequency of the sandwich transducer.","PeriodicalId":113185,"journal":{"name":"2018 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121194879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Simulation of the Propagation Behavior of Short Cracks in Q235 Steel Based on Stress-Magnetic Coupling 基于应力-磁耦合的Q235钢短裂纹扩展行为模拟
2018 IEEE Far East NDT New Technology & Application Forum (FENDT) Pub Date : 2018-07-01 DOI: 10.1109/FENDT.2018.8681952
Yi Liu, Bo Hu
{"title":"Simulation of the Propagation Behavior of Short Cracks in Q235 Steel Based on Stress-Magnetic Coupling","authors":"Yi Liu, Bo Hu","doi":"10.1109/FENDT.2018.8681952","DOIUrl":"https://doi.org/10.1109/FENDT.2018.8681952","url":null,"abstract":"A stress-magnetic coupling model was established from the perspective of energy conservation to study the variation rule of the magnetic signals in the process of short crack propagation in Q235 steel. The stress distribution and magnetic induction intensity caused by the propagation of surface short cracks in different directions can be solved using the finite element method. The effect of early short crack propagation under the tensile load on the magnetic signals of the surface space was analyzed. Results showed that magnetic induction intensity linearly increased with the increase in tensile stress. The propagation of short cracks in all directions would affect the surface magnetic induction intensity, wherein the magnetic signal was most sensitive to depth change and least sensitive to length change. The peak value of magnetic anomaly first increased and then decreased with the increase in the length and depth of short cracks and gradually increased with depth. Early damage in Q235 steel can be determined by measuring the magnetic induction intensity of the surface. This approach provided a new idea for the application of the magnetic detection method in the quantitative problem of short cracks.","PeriodicalId":113185,"journal":{"name":"2018 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115400357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Investigation of Remote Field Eddy Current Defect Detection for Pipeline Welds 远程场涡流检测管道焊缝缺陷的研究
2018 IEEE Far East NDT New Technology & Application Forum (FENDT) Pub Date : 2018-07-01 DOI: 10.1109/FENDT.2018.8681970
Lian Xie, B. Gao, G. Tian, Xiang Xiao, Shichun Wu, Ying Yin, Dan Mao
{"title":"Investigation of Remote Field Eddy Current Defect Detection for Pipeline Welds","authors":"Lian Xie, B. Gao, G. Tian, Xiang Xiao, Shichun Wu, Ying Yin, Dan Mao","doi":"10.1109/FENDT.2018.8681970","DOIUrl":"https://doi.org/10.1109/FENDT.2018.8681970","url":null,"abstract":"Due to the roughness and the geometry of the weld region on the pipeline, the defects detection remains as a challenge task by using Nondestructive Testing (NDT) techniques. Remote field eddy current testing (RFECT) has been applied for the detection of the deeper hidden cracks due to its significant penetrate ability. This paper investigates the feasibility study for deeper weld defects detection by using RFECT. In particular, optimizing parameters such as phase rotation and noise reduction have been conducted to enhance the detectability. The impact factor of lift-off is studied to balance the uniformity and intensity of the eddy current distribution. The results have been validated for girth weld defects detection with an extreme deep depth at 9.0 mm of the X70 Pipeline with large lift-off distance at 4.7mm.","PeriodicalId":113185,"journal":{"name":"2018 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114304582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Focal Law Optimization and Acoustic Field Simulation of PAUT on CFRP Radii CFRP半径上聚能炮的焦点规律优化及声场模拟
2018 IEEE Far East NDT New Technology & Application Forum (FENDT) Pub Date : 2018-07-01 DOI: 10.1109/FENDT.2018.8681962
Zhongbing Luo, Feilong Li, Huan-qing Cao, S. Jin, Li Lin
{"title":"Focal Law Optimization and Acoustic Field Simulation of PAUT on CFRP Radii","authors":"Zhongbing Luo, Feilong Li, Huan-qing Cao, S. Jin, Li Lin","doi":"10.1109/FENDT.2018.8681962","DOIUrl":"https://doi.org/10.1109/FENDT.2018.8681962","url":null,"abstract":"The focal law and ultrasonic field of phased array ultrasonic testing (PAUT) on carbon fiber reinforced plastic (CFRP) laminates radii were studied based on numerical modeling. The geometrical and elastic anisotropy factors were taken into account respectively and the corresponding focal laws were calculated. Comparing with the results of the elastically isotropic flat plate, the results show that the original delay times of the linear array elements presented parabolic distribution and the focusing effect in the elastically isotropic radii was obvious. The actual focal point, however, was 1.6mm ahead of the preset focus depth of 3 mm. Under the same focus law, the focusing in the radii of CFRP laminates deteriorated significantly, and the structural noise was evident. After the optimization of focus law considering geometric shape, the energy of focusing beam was increased, but it was quite local in the subsurface. With further consideration of the elastic anisotropy, the incident acoustic energy was increased from the both sides, and the focusing was significantly improved.","PeriodicalId":113185,"journal":{"name":"2018 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126739331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Detection and Reconstruction of Rolling Contact Fatigue Cracks Using Eddy Current Pulsed Thermography 利用涡流脉冲热成像技术检测和重建滚动接触疲劳裂纹
2018 IEEE Far East NDT New Technology & Application Forum (FENDT) Pub Date : 2018-07-01 DOI: 10.1109/FENDT.2018.8681977
Junzhen Zhu, Jianbo Wu, G. Tian, Yunlai Gao
{"title":"Detection and Reconstruction of Rolling Contact Fatigue Cracks Using Eddy Current Pulsed Thermography","authors":"Junzhen Zhu, Jianbo Wu, G. Tian, Yunlai Gao","doi":"10.1109/FENDT.2018.8681977","DOIUrl":"https://doi.org/10.1109/FENDT.2018.8681977","url":null,"abstract":"Eddy current pulsed thermography (ECPT) as one of the emerging nondestructive techniques has been recently used for defect evaluation in the rail track. This paper focuses on detecting and reconstructing the rolling contact fatigue (RCF) cracks in a cut-off rail track specimen. Specifically, two features extracted from the maximum thermal rise and gradient of first differential thermal results are used to quantify the pocket length and the angle of RCF cracks. Based on these quantitative results, the reconstructed parameters of the RCF cracks are further compared with the X-ray CT result. Results show that ECPT has the advantage of indirectly presenting the 3D parameters of the crack without the specimen size influence. However, the accuracy and reliability of the reconstructed results depend on the position of the crack (edge effect), the thermal pattern of different defects, and the performance of the IR camera.","PeriodicalId":113185,"journal":{"name":"2018 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124142759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Research on Damage Imaging Accuracy of the Guided Wave 导波损伤成像精度研究
2018 IEEE Far East NDT New Technology & Application Forum (FENDT) Pub Date : 2018-07-01 DOI: 10.1109/FENDT.2018.8681965
Nuoke Wei, Jichao Xu, Y. Xiang
{"title":"Research on Damage Imaging Accuracy of the Guided Wave","authors":"Nuoke Wei, Jichao Xu, Y. Xiang","doi":"10.1109/FENDT.2018.8681965","DOIUrl":"https://doi.org/10.1109/FENDT.2018.8681965","url":null,"abstract":"Ultrasonic guided wave has attracted considerable attention for structural health monitoring (SHM) due to slight propagation loss and sensitivity to damage. However, the location imaging accuracy reduces hugely as the guided wave is often affected by the reflection of the structure boundary and system noise. In this paper, an improving method was established, in which the distance coefficient and the time coefficient were proposed to select and intercept high signal noise ratio data from all experimental data. The effectiveness of the proposed method was evaluated experimentally with sensors array of different square areas. The experiment result revealed that the location imaging accuracy and efficiency were improved more than 50% and 30% respectively by using the improving method, which shown to offer significant performance advantages for SHM.","PeriodicalId":113185,"journal":{"name":"2018 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121903173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Investigation of Residual Stress in U-shaped Block by Using Ultrasonic and Finite Element Method 用超声和有限元法研究u形块体的残余应力
2018 IEEE Far East NDT New Technology & Application Forum (FENDT) Pub Date : 2018-07-01 DOI: 10.1109/FENDT.2018.8681972
Zhi-xiang Li, Chunguang Xu, Kai Wu, Yuren Lu
{"title":"Investigation of Residual Stress in U-shaped Block by Using Ultrasonic and Finite Element Method","authors":"Zhi-xiang Li, Chunguang Xu, Kai Wu, Yuren Lu","doi":"10.1109/FENDT.2018.8681972","DOIUrl":"https://doi.org/10.1109/FENDT.2018.8681972","url":null,"abstract":"Formation of residual stress, as results of machining process, is a familiar fact. One question that needs to be raised is how to know the actual value of residual stress and its distribution in work. In this paper, we explore a detecting-system based on ultrasonic and Wi-Fi to measure residual stress in materials expediently. By using different frequencies and normal transducers, residual stresses in different depths and surface of a U-shaped block, designed with the states of opening and closing, are measured by cross-correlation algorithm about difference of times LCR wave spreading. The Finite Element method analyzing the U-shaped block provides an object contrast to verify the correctness of results detected by the detecting system. We evaluate significantly the actual value of residual stress by comparing a position existing residual stress with another position without residual stress. The second contribution of the paper is to build a system about calibrating the results of residual stress measured by ultrasonic.","PeriodicalId":113185,"journal":{"name":"2018 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131530096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Velocity effect in defect detection for ferrite metals by electromagnetic NDT 电磁无损检测铁氧体金属缺陷检测中的速度效应
2018 IEEE Far East NDT New Technology & Application Forum (FENDT) Pub Date : 2018-07-01 DOI: 10.1109/FENDT.2018.8681966
Y. Fei, Yu Yating, Y. Na, Wei Xu, Zhao Ning, Tian Guiyun
{"title":"Velocity effect in defect detection for ferrite metals by electromagnetic NDT","authors":"Y. Fei, Yu Yating, Y. Na, Wei Xu, Zhao Ning, Tian Guiyun","doi":"10.1109/FENDT.2018.8681966","DOIUrl":"https://doi.org/10.1109/FENDT.2018.8681966","url":null,"abstract":"Nondestructive Testing (NDT) for moving ferrite metal component is a challenging topic because of the magnetic fields generated by the motion induced eddy current (MIEC) and ferrite magnetization in sample. The magnetic fields distribution inside the moving ferrite metal are more complicated. Therefore, an accurate and efficient NDT technique for monitoring the health condition of metal component with the high-speed is an urgent problem. In order to investigate the influence of velocity effect on defect detection of ferrite metal components, a numerical simulation model of the electromagnetic NDT system by using Finite element method was established, and the relationship between the detection signal and velocity considering the different defect depths and widths are deeply analyzed. The results show that with the increase of the speed, the MIEC is stronger and the dragging effect is more obvious, which are the new phenomenon for the moving sample compared with the static sample. Furthermore, the defect width and depth can be reflected by the magnetic flux density, and the strength of the magnetic flux density increases with the increase of the speed, which is advantageous to the localization and characterization of the defect. The findings in this paper are helpful and beneficial to propose a new NDT method for the defect detection in the moving ferrite metals, such as rail tracks and pipelines.","PeriodicalId":113185,"journal":{"name":"2018 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128294086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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