2021 IEEE Far East NDT New Technology & Application Forum (FENDT)最新文献

3D defect reconstruction method based on projection Levenberg-Marquart algorithm 基于投影Levenberg-Marquart算法的三维缺陷重建方法

2021 IEEE Far East NDT New Technology & Application Forum (FENDT) Pub Date : 2021-12-14 DOI: 10.1109/FENDT54151.2021.9749671

Kun Wang, Wenhua Han, Hai-hang Wang

{"title":"3D defect reconstruction method based on projection Levenberg-Marquart algorithm","authors":"Kun Wang, Wenhua Han, Hai-hang Wang","doi":"10.1109/FENDT54151.2021.9749671","DOIUrl":"https://doi.org/10.1109/FENDT54151.2021.9749671","url":null,"abstract":"Magnetic flux leakage detection is widely used in the on-line detection of ferromagnetic materials and equipment. It is an effective defect detection method. How to reconstruct the outline of three-dimensional irregular defect by using magnetic flux leakage signal is the key problem in magnetic flux leakage detection. However, the finite element model of magnetic flux leakage detection for three-dimensional irregular defects requires a large amount of computation, and the ill-posed defect reconstruction problem makes it difficult to obtain the accurate outline of irregular defects. In this paper, an element magnetic dipole band superposition model is proposed for calculating magnetic flux leakage signals of three-dimensional irregular defects, and the validity of the forward model for calculating magnetic flux leakage signals is demonstrated. For the high-dimensional optimization problem of three-dimensional defect contour reconstruction, a projection Levenberg-Marquart algorithm with boundary constraints is proposed. Reconstruction of three - dimensional irregular defect contour is realized. The simulation results show that the defect reconstruction method does not need a lot of magnetic flux leakage detection data, and the contour reconstruction results have high accuracy.","PeriodicalId":425658,"journal":{"name":"2021 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115089145","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

Surface Defect Detection of Cable Based on Threshold Image Difference 基于阈值图像差分的电缆表面缺陷检测

2021 IEEE Far East NDT New Technology & Application Forum (FENDT) Pub Date : 2021-12-14 DOI: 10.1109/FENDT54151.2021.9749676

Jianuo Chen, Hua Wang, Chun-lei Tu, Xingsong Wang, Xiang-dong Li

{"title":"Surface Defect Detection of Cable Based on Threshold Image Difference","authors":"Jianuo Chen, Hua Wang, Chun-lei Tu, Xingsong Wang, Xiang-dong Li","doi":"10.1109/FENDT54151.2021.9749676","DOIUrl":"https://doi.org/10.1109/FENDT54151.2021.9749676","url":null,"abstract":"When using computer vision technology to detect defects on cable surface of cable-stayed bridge, the image is easy to be affected by natural light and produce uneven illumination, which will lead to missing detection of defects in relevant areas during detection. Meanwhile, the non-linear edge shape of cable also brings inconvenience to the extraction of effective areas. Therefore, a method of surface defect detection for cable of cable-stayed bridge based on threshold image's difference is proposed. Firstly, the gray scale and gradient characteristics of cable images were analyzed, and based on the manual ROI extraction method, the automatic ROI extraction method of cable was designed based on Gaussian mixture model. Then, an appropriate image processing algorithm is selected to enhance the cable image. Finally, the threshold results of the image to be detected and the original image are differentiated, and the existence of defects is determined by calculating the maximum connected area. The experimental results on the bridge show that the effective area extracted by this algorithm is accurate, and it can effectively reduce the bright spots or shadows caused by uneven natural light. Meanwhile, it has a good detection result for the defects of cable surface, such as broken wire, deformation and wear, which has a high application value.","PeriodicalId":425658,"journal":{"name":"2021 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115261113","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

Research of Magnetic Acoustic Emission Inspection Based on on-board storage CNG Cylinder 基于储运CNG气瓶的磁声发射检测研究

2021 IEEE Far East NDT New Technology & Application Forum (FENDT) Pub Date : 2021-12-14 DOI: 10.1109/FENDT54151.2021.9749685

Yilin Yuau, Wenjun Zhang, Yongna Shen, G. Shen, Kuan Su

引用次数: 0

Evaluation of Wheelset Re-profiling Strategies Based on Combination Weighting TOPSIS 基于组合加权TOPSIS的轮对重型策略评价

2021 IEEE Far East NDT New Technology & Application Forum (FENDT) Pub Date : 2021-12-14 DOI: 10.1109/FENDT54151.2021.9749686

Yan-ping Mou, Yu Zhang, Xiaoqin Gao, Jianping Peng, Chun-rong Qiu, Deng-zhi Liu

{"title":"Evaluation of Wheelset Re-profiling Strategies Based on Combination Weighting TOPSIS","authors":"Yan-ping Mou, Yu Zhang, Xiaoqin Gao, Jianping Peng, Chun-rong Qiu, Deng-zhi Liu","doi":"10.1109/FENDT54151.2021.9749686","DOIUrl":"https://doi.org/10.1109/FENDT54151.2021.9749686","url":null,"abstract":"In view of the subjective and single problem of the current evaluation methods of train re-profiling strategies, taking the single-wheel re-profiling strategies of CRH380D trains as an example, a new evaluation is proposed and it combines entropy weight, the weight of analytic hierarchy process, and the Preference for Order Preference by Similarity to an Ideal Solution (TOPSIS). Firstly, establish a multi-objective decision-making model and evaluation indicators based on the principle of wheelset re-profiling strategy. Secondly, use Monte Carlo simulation to simulate the single-wheel repair strategies and the corresponding expected value. Then, the objective weight of entropy is established based on the re-profiling strategies, the subjective weight of the analytic hierarchy process is established based on the importance of the three indicators, and the subjective and objective weights are combined to form a new evaluation method with TOPSIS. Finally, the traditional evaluation method and the combined weight TOPSIS evaluation method are used to evaluate the wheelset re-profiling strategy. The results show that compared with the traditional evaluation method, the average value of the combined weighted TOPSIS evaluation value is increased by 31.6%, the standard deviation is reduced by 30.6%, and its stability and reliability are significantly improved.","PeriodicalId":425658,"journal":{"name":"2021 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129576256","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

Automated Measurement System for Hysteresis Lines and Magnetic Parameters of Magnetic Materials 磁性材料磁滞线及磁参量自动测量系统

2021 IEEE Far East NDT New Technology & Application Forum (FENDT) Pub Date : 2021-12-14 DOI: 10.1109/FENDT54151.2021.9749692

Zewen Wan, Ze Liu, Wei Yuan

引用次数: 0

Terahertz time-domain spectroscopy detection of metal foreign bodies in GIS equipment GIS设备中金属异物的太赫兹时域光谱检测

2021 IEEE Far East NDT New Technology & Application Forum (FENDT) Pub Date : 2021-12-14 DOI: 10.1109/FENDT54151.2021.9749674

Zong Li, Peng-jin Zong, Xue-ting Cheng, Fangcheng Qiu, Rongfang Liu, Xiao-liang Fan, Xuwen Kong, Sheng-qi Jiang

{"title":"Terahertz time-domain spectroscopy detection of metal foreign bodies in GIS equipment","authors":"Zong Li, Peng-jin Zong, Xue-ting Cheng, Fangcheng Qiu, Rongfang Liu, Xiao-liang Fan, Xuwen Kong, Sheng-qi Jiang","doi":"10.1109/FENDT54151.2021.9749674","DOIUrl":"https://doi.org/10.1109/FENDT54151.2021.9749674","url":null,"abstract":"Metallic foreign bodies often appear in Gas-insulated Switchgear (GIS). Metallic foreign bodies can cause great harm to the insulation performance of GIS equipment. Therefore, it is very necessary to detect metal foreign bodies in GIS equipment. In this paper, terahertz time-domain spectroscopy is used to measure the three insulating materials of epoxy resin, silicon rubber, ceramics and the mixture of the three materials experimentally. Then obtain the time-domain, frequency-domain, and absorption spectra of the four groups of materials. On this basis, aluminum powder and copper powder were added to the four sets of insulating material samples, and the time domain, frequency domain, and absorption spectra of the materials after adding aluminum powder and copper powder were obtained by using terahertz time-domain spectroscopy technology. The experimental results show that after adding the metal powder to the insulating material, the time domain, frequency domain and absorption spectrogram of the material will be significantly reduced. The terahertz technology can quickly and accurately detect whether there are metal foreign bodies in the GIS equipment, thereby ensuring the safe operation of the power grid.","PeriodicalId":425658,"journal":{"name":"2021 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128927143","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

Multi-Source Translation CT Based Projection Completion Method for ROI Reconstruction 基于多源平移CT的ROI重建投影补全方法

2021 IEEE Far East NDT New Technology & Application Forum (FENDT) Pub Date : 2021-12-14 DOI: 10.1109/FENDT54151.2021.9749683

Tan Chuandong, Li Lei, Fang Cheng, Jin Heng, Liu Fenglin, Duan Liming

引用次数: 0

A Method of Searching for a Rotating Angle of LFDC Signals in NNTCM Algorithm NNTCM算法中LFDC信号旋转角度的搜索方法

2021 IEEE Far East NDT New Technology & Application Forum (FENDT) Pub Date : 2021-12-14 DOI: 10.1109/FENDT54151.2021.9749688

Yong Nie, Shu-sheng Liao, Mei-ming Feng, Pan Qi, Wenxi Wei

{"title":"A Method of Searching for a Rotating Angle of LFDC Signals in NNTCM Algorithm","authors":"Yong Nie, Shu-sheng Liao, Mei-ming Feng, Pan Qi, Wenxi Wei","doi":"10.1109/FENDT54151.2021.9749688","DOIUrl":"https://doi.org/10.1109/FENDT54151.2021.9749688","url":null,"abstract":"In eddy current testing (denoted as ECT), for restraining the support structure and reserving the flaw, one has invented a mixing-frequency method by adding signals in different channels. Later, our team has presented a NNT-cancellation mixing-frequency (denoted as NNTCM) method, in which one uses the information about the data about some heat transfer tube, but not about the calibration tube to realize cancellation, and the final result from a group of given data is stable and ideal intuitively. However, in that algorithm we didn't give the specific method of obtaining the rotating angle of the low-frequency differential channel (LFDC) signal to make the cancelled-structure energy minimize. To do this, in this paper we present a method of searching for the rotating angle of the LFDC signals, in which, we first determine the positions of these structures, and then give a rotating angle of the high-frequency differential channel (denoted as HFDC) signal when the phase angle of the through-hole is pointed to 40 degrees, and next, let the rotating angle of the LFDC signals change from 1 degree to 180 degrees, in the following we take these actions on high and low signals: rotating, removing the trend curve, cancelling, computing out all the sums of the norms of the signals at all structures after cancellation, giving the minimal index of the sum vector, which is the rotating angle of the LFDC signal we seek. More examples show this method is effective.","PeriodicalId":425658,"journal":{"name":"2021 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"169 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126482731","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

A Uniform Transversely Polarized Shear Horizontal Electromagnetic Acoustic Transducer for Stress Measurement 用于应力测量的均匀横极化剪切水平电磁声换能器

2021 IEEE Far East NDT New Technology & Application Forum (FENDT) Pub Date : 2021-12-14 DOI: 10.1109/FENDT54151.2021.9749660

Zi-yang Qian, Xuan-chen Li, Zhengyang Qu, Shu-juan Wang

引用次数: 1

Design of Broadband Magnetostrictive Sheared Horizontal Guided Wave Transducer for Structural Health Monitoring 用于结构健康监测的宽带磁致伸缩剪切水平导波传感器设计

2021 IEEE Far East NDT New Technology & Application Forum (FENDT) Pub Date : 2021-12-14 DOI: 10.1109/FENDT54151.2021.9749684

Wei-hang Zhou, Xiaohong Ma, Ce Li, Yi-ren Qin, G. Zhai

{"title":"Design of Broadband Magnetostrictive Sheared Horizontal Guided Wave Transducer for Structural Health Monitoring","authors":"Wei-hang Zhou, Xiaohong Ma, Ce Li, Yi-ren Qin, G. Zhai","doi":"10.1109/FENDT54151.2021.9749684","DOIUrl":"https://doi.org/10.1109/FENDT54151.2021.9749684","url":null,"abstract":"In view of the defect that the magnetostrictive guided wave transducer with meander coil structure can only excite and receive the strong guided wave signal at a fixed frequency, a broadband magnetostrictive Sheared Horizontal (SH) guided wave transducer is designed for structural health monitoring of metal pipes and plates. This paper demonstrates the energy transfer mechanism of magnetostrictive SH guided wave transducer and proposes a type of transducer structure of small-width coil and magnetostrictive patch. Comparative experiments are conducted to study how magnetostrictive patch width and coil width influence the relationship between amplitude and frequency of guided wave signal of the transducer, and the transducer designed in this paper is used for the defect detection experiment. According to the experimental results, when the coil and the magnetostrictive patch are of the same width, the change of their width can notably influence the center frequency of the transducer, and the transducer can excite and receive SH guided waves with higher amplitude in a larger frequency range. The transducer designed in this paper can detect the defects with a smaller section loss rate by increasing the excitation frequency without changing the coil, which is more suitable for the structural health monitoring of industrial equipment.","PeriodicalId":425658,"journal":{"name":"2021 IEEE Far East NDT New Technology & Application Forum (FENDT)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132240064","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