Pub Date : 2023-10-29DOI: 10.1080/10589759.2023.2274006
Harshit Jain, V. H. Patankar
{"title":"Simulations and experimentation of ultrasonic wave propagation and flaw characterisation for underwater concrete structures","authors":"Harshit Jain, V. H. Patankar","doi":"10.1080/10589759.2023.2274006","DOIUrl":"https://doi.org/10.1080/10589759.2023.2274006","url":null,"abstract":"","PeriodicalId":49746,"journal":{"name":"Nondestructive Testing and Evaluation","volume":"1 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136136536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-29DOI: 10.1080/10589759.2023.2274016
Mohammad Mostafa Khalili, Mohammadreza Farahani, Pouya Faraji Kalajahi, Milad Mohammadian
{"title":"Nondestructive evaluation of cooling passages and their blockage using vapor excited active thermography","authors":"Mohammad Mostafa Khalili, Mohammadreza Farahani, Pouya Faraji Kalajahi, Milad Mohammadian","doi":"10.1080/10589759.2023.2274016","DOIUrl":"https://doi.org/10.1080/10589759.2023.2274016","url":null,"abstract":"","PeriodicalId":49746,"journal":{"name":"Nondestructive Testing and Evaluation","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136157965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-29DOI: 10.1080/10589759.2023.2274018
Pu Huang, Xiaofei Huang, Zhiying Li, Yuedong Xie
ABSTRACTDistributed point source method (DPSM) has been gradually applied to the field of nondestructive testing (NDT). As a semi-analytical modelling technique, DPSM is extremely powerful and straightforward for solving various engineering problems, such as ultrasonic fields and electromagnetic field. In this paper, the technique is extended to model the eddy current field including sweep frequency measurement and scanning defect. The configuration of eddy current sensors consists of excitation coil and solid-state magnetic field measurement sensors such as Hall device and giant magnetoresistive sensor. Besides that, the wave propagation has been described and magnetic field created by eddy current has been calculated. The results obtained by DPSM is compared with that calculated by finite element method (FEM) in terms of accuracy and computation time, which indicates DPSM can improve calculation speed while ensuring calculation accuracy.KEYWORDS: DPSMnondestructive testingeddy currentsweep frequency modescanning defect Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by the Fundamental Research Funds for the Central Universities [KG12-1124-01]; National Natural Science Foundation of China [61901022]; Academic Excellence Foundation of BUAA for PhD Students..
{"title":"Distributed point source method for eddy current modelling","authors":"Pu Huang, Xiaofei Huang, Zhiying Li, Yuedong Xie","doi":"10.1080/10589759.2023.2274018","DOIUrl":"https://doi.org/10.1080/10589759.2023.2274018","url":null,"abstract":"ABSTRACTDistributed point source method (DPSM) has been gradually applied to the field of nondestructive testing (NDT). As a semi-analytical modelling technique, DPSM is extremely powerful and straightforward for solving various engineering problems, such as ultrasonic fields and electromagnetic field. In this paper, the technique is extended to model the eddy current field including sweep frequency measurement and scanning defect. The configuration of eddy current sensors consists of excitation coil and solid-state magnetic field measurement sensors such as Hall device and giant magnetoresistive sensor. Besides that, the wave propagation has been described and magnetic field created by eddy current has been calculated. The results obtained by DPSM is compared with that calculated by finite element method (FEM) in terms of accuracy and computation time, which indicates DPSM can improve calculation speed while ensuring calculation accuracy.KEYWORDS: DPSMnondestructive testingeddy currentsweep frequency modescanning defect Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by the Fundamental Research Funds for the Central Universities [KG12-1124-01]; National Natural Science Foundation of China [61901022]; Academic Excellence Foundation of BUAA for PhD Students..","PeriodicalId":49746,"journal":{"name":"Nondestructive Testing and Evaluation","volume":"71 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136134425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ABSTRACTParticle-reinforced polymer matrix composites (PMCs) are often used as radar-absorbing materials (RAM) in aircraft stealth applications. The thickness evaluation of such multilayered coatings with micrometre-level thickness is highly challenging from single-side access. In this study, we used Terahertz Time-domain Spectroscopy (THz-TDS) in the transmission mode to extract the refractive index of the dielectric coatings for measuring the thickness using the time-of-flight method. A numerical study based on the Finite Element method (FEM) has also been developed to validate the transmission experiments. A frequency-dependent complex dielectric parameters must be considered for coatings with high absorption in the THz regime. This was addressed by performing the finite element simulations in a frequency domain. The thickness of each layer of a multi-layered coating is estimated by carrying out the experiments in reflection mode. Since the interface echoes were overlapping, a deconvolution algorithm and frequency thresholding were employed to reconstruct the signals reflected from the different interfaces. Using this technique, the thickness of each layer of coating is estimated accurately in a single measurement, which was challenging to measure using other conventional non-destructive testing (NDT) methods.KEYWORDS: Terahertz-time domain spectroscopyfinite element methodmulti-layer coatingthickness measurementterahertz pulsed imagingnon-destructive evaluation AcknowledgmentsThis study was supported by the Defense Laboratory Jodhpur, DRDO. We thank Dr Abhinandan Jain and Dr M. K. Pathra from Defense Laboratory Jodhpur, DRDO, for their continuous support throughout this project. We also want to thank Dr Sreedhar Unnikrishnakurup from the Institute of Material Research and Engineering (IMRE), A*STAR, Singapore, for providing us with the CT images and his technical inputs in the THz domain.Disclosure statementNo potential conflict of interest was reported by the author(s).Data availability statementThe data that supports the findings of this study are available from the corresponding authors upon reasonable request.Additional informationFundingThis work has been funded by the “Samsung-IITM Pravartak Fellowship” by Samsung India Electronics Pvt. Ltd as part of their CSR initiative.
摘要颗粒增强聚合物基复合材料(PMCs)是飞机隐身中常用的吸波材料。这种微米级多层涂层的厚度评估从单面进入是极具挑战性的。在本研究中，我们在传输模式下使用太赫兹时域光谱(THz-TDS)提取介质涂层的折射率，并使用飞行时间法测量厚度。基于有限元法的数值研究验证了传动实验的正确性。对于在太赫兹波段具有高吸收的涂层，必须考虑频率相关的复介电参数。通过在频域进行有限元模拟，解决了这一问题。通过在反射模式下进行实验，估计了多层涂层的各层厚度。由于界面回波存在重叠，采用反褶积算法和频率阈值法对不同界面反射信号进行重构。使用该技术，可以在一次测量中准确估计每层涂层的厚度，这是使用其他传统无损检测(NDT)方法测量的挑战。关键词:太赫兹时域光谱;有限元方法;多层涂层;太赫兹脉冲成像;我们感谢印度国防研究与发展组织焦特布尔国防实验室的Abhinandan Jain博士和M. K. Pathra博士在整个项目中不断给予的支持。我们还要感谢新加坡A*STAR材料研究与工程研究所(IMRE)的Sreedhar Unnikrishnakurup博士为我们提供了CT图像以及他在太赫兹域的技术投入。披露声明作者未报告潜在的利益冲突。数据可用性声明支持本研究结果的数据可根据合理要求从通讯作者处获得。本研究由三星印度电子有限公司的“Samsung- iitm Pravartak奖学金”资助，作为其企业社会责任倡议的一部分。
{"title":"Nondestructive evaluation of aircraft stealth coating by Terahertz-time domain spectroscopy: experimental and numerical investigation","authors":"Sachinlal Aroliveetil, Nithin Puthiyaveetil, Krishnan Balasubramaniam","doi":"10.1080/10589759.2023.2274002","DOIUrl":"https://doi.org/10.1080/10589759.2023.2274002","url":null,"abstract":"ABSTRACTParticle-reinforced polymer matrix composites (PMCs) are often used as radar-absorbing materials (RAM) in aircraft stealth applications. The thickness evaluation of such multilayered coatings with micrometre-level thickness is highly challenging from single-side access. In this study, we used Terahertz Time-domain Spectroscopy (THz-TDS) in the transmission mode to extract the refractive index of the dielectric coatings for measuring the thickness using the time-of-flight method. A numerical study based on the Finite Element method (FEM) has also been developed to validate the transmission experiments. A frequency-dependent complex dielectric parameters must be considered for coatings with high absorption in the THz regime. This was addressed by performing the finite element simulations in a frequency domain. The thickness of each layer of a multi-layered coating is estimated by carrying out the experiments in reflection mode. Since the interface echoes were overlapping, a deconvolution algorithm and frequency thresholding were employed to reconstruct the signals reflected from the different interfaces. Using this technique, the thickness of each layer of coating is estimated accurately in a single measurement, which was challenging to measure using other conventional non-destructive testing (NDT) methods.KEYWORDS: Terahertz-time domain spectroscopyfinite element methodmulti-layer coatingthickness measurementterahertz pulsed imagingnon-destructive evaluation AcknowledgmentsThis study was supported by the Defense Laboratory Jodhpur, DRDO. We thank Dr Abhinandan Jain and Dr M. K. Pathra from Defense Laboratory Jodhpur, DRDO, for their continuous support throughout this project. We also want to thank Dr Sreedhar Unnikrishnakurup from the Institute of Material Research and Engineering (IMRE), A*STAR, Singapore, for providing us with the CT images and his technical inputs in the THz domain.Disclosure statementNo potential conflict of interest was reported by the author(s).Data availability statementThe data that supports the findings of this study are available from the corresponding authors upon reasonable request.Additional informationFundingThis work has been funded by the “Samsung-IITM Pravartak Fellowship” by Samsung India Electronics Pvt. Ltd as part of their CSR initiative.","PeriodicalId":49746,"journal":{"name":"Nondestructive Testing and Evaluation","volume":"12 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136161070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-28DOI: 10.1080/10589759.2023.2274003
Qi Jin, Haoyan Yu, Zhaozong Meng, Fei Fei, Zhen Li
ABSTRACTA novel non-destructive testing scheme was proposed for the detection of impact damage in glass fibre-reinforced polymer (GFRP) composites using a microwave planar resonator sensor. The sensor offers the advantages of small size, low cost and simple structure. It is an open-circuited λ/2 long microstrip line and the detection principle is material perturbation. Electromagnetic simulation verifies the sensor design. A GFRP specimen subjected to 5,10 and 20 J impact was examined. The 20 J impact damage was detected through line and two-dimensional scanning. The line scanning enabled accurate localisation of the damage, whereas the two-dimensional scanning facilitated more precise reconstruction of the surface damage features in addition to localisation. The sensor performance for detecting impact damage with lower energy levels was investigated by line scanning. It was found that the sensor could detect and locate 10 J impact damage. Principal component analysis was introduced to significantly reduce the false detection of the 5 J impact damage. It is well demonstrated that the proposed scheme could serve as an alternative method.KEYWORDS: Planar resonatorimpact damageGFRPmaterial perturbationresonant frequency Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was financially supported by the National Natural Science Foundation of China (Grant No. 52105552) and the Postgraduate Research & Practice Innovation Program of Jiangsu Province (Grant No. SJCX23_0099).
{"title":"Detection of impact damage in glass fibre-reinforced polymer composites using a microwave planar resonator sensor","authors":"Qi Jin, Haoyan Yu, Zhaozong Meng, Fei Fei, Zhen Li","doi":"10.1080/10589759.2023.2274003","DOIUrl":"https://doi.org/10.1080/10589759.2023.2274003","url":null,"abstract":"ABSTRACTA novel non-destructive testing scheme was proposed for the detection of impact damage in glass fibre-reinforced polymer (GFRP) composites using a microwave planar resonator sensor. The sensor offers the advantages of small size, low cost and simple structure. It is an open-circuited λ/2 long microstrip line and the detection principle is material perturbation. Electromagnetic simulation verifies the sensor design. A GFRP specimen subjected to 5,10 and 20 J impact was examined. The 20 J impact damage was detected through line and two-dimensional scanning. The line scanning enabled accurate localisation of the damage, whereas the two-dimensional scanning facilitated more precise reconstruction of the surface damage features in addition to localisation. The sensor performance for detecting impact damage with lower energy levels was investigated by line scanning. It was found that the sensor could detect and locate 10 J impact damage. Principal component analysis was introduced to significantly reduce the false detection of the 5 J impact damage. It is well demonstrated that the proposed scheme could serve as an alternative method.KEYWORDS: Planar resonatorimpact damageGFRPmaterial perturbationresonant frequency Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was financially supported by the National Natural Science Foundation of China (Grant No. 52105552) and the Postgraduate Research & Practice Innovation Program of Jiangsu Province (Grant No. SJCX23_0099).","PeriodicalId":49746,"journal":{"name":"Nondestructive Testing and Evaluation","volume":"39 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136160879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-26DOI: 10.1080/10589759.2023.2274005
Cuong Phan Hoang, Dung Nguyen Van, Hoang Pham Quoc, Nhung Nguyen Thi Cam, Minh Phung Van, Thai Le Minh
ABSTRACTThis paper uses numerical and experimental methods to look at how well Xar450 and Perform 700 high-strength steels protect against a 7.62 × 39 mm API BZ projectile. The numerical study of the target thicknesses varies from 3 mm to 4 mm and 6 mm. And they are struck at 0°, 15°, 30°, 45°, and 60° oblique angles. Numerical simulation results show that at a normal impact angle, the bullet can break through the Perform700 targets in all thicknesses; however, the resistance performance of the target plate increases with the rise of oblique angles. The Xar450 target plates of 4 mm and 6 mm can resist the bullet at any oblique angle, but the bullet can easily penetrate 3 mm thickness from 0° to 30° oblique angles. The experiment is based on the VPAM-APR 2006 standard. The experiment results showed that the bullet perforated through the Perform700 target plate with a thickness of 3 mm at 0° and 30° oblique angles. In contrast, the bullet cannot penetrate the Xar450 target thickness of 4 mm at a normal angle. The findings of this research are used in the formulation of the design methodology for a light armoured vehicle. Besides, they have considerable importance in the realm of calculating and developing anti-fracture structures for practical applications.KEYWORDS: 7.62x39 mm API BZ projectilenumerical simulationXar450Perform700oblique angle AcknowledgementThis research is funded by Le Quy Don Technical University Research Fund under the grand number 23.1.10.Disclosure statementNo potential conflict of interest was reported by the author(s).Data availability statementThe data that support the findings of this study are available from the corresponding authors upon reasonable requestAdditional informationFundingThis work was supported by the This research is funded by Le Quy Don Technical University Research Fund [23.1.10].
摘要本文采用数值和实验方法研究了Xar450和Perform 700高强度钢对7.62 × 39 mm API BZ弹丸的防护效果。目标厚度的数值研究范围从3mm到4mm和6mm。它们以0°，15°，30°，45°和60°的斜角击打。数值模拟结果表明，在正常冲击角度下，子弹可以击穿所有厚度的Perform700目标;但随着斜倾角的增大，靶板的阻力性能有所提高。4mm和6mm的Xar450靶板可以抵抗任何斜角的子弹，但从0°到30°的斜角上，子弹可以很容易地穿透3mm厚度。实验基于VPAM-APR 2006标准。实验结果表明，子弹以0°和30°斜角击穿厚度为3 mm的Perform700靶板。相比之下，子弹不能以正常角度穿透4毫米的Xar450目标厚度。这项研究的结果被用于轻型装甲车设计方法的制定。此外，它们在实际应用的抗断裂结构的计算和开发领域具有相当重要的意义。关键词:7.62x39 mm API BZ弹丸数值模拟xar450perform700斜角确认本研究由黎基东理工大学研究基金资助，项目编号23.1.10。披露声明作者未报告潜在的利益冲突。数据可得性声明支持本研究结果的数据可在合理要求下从通讯作者处获取。附加信息经费本研究由黎贵敦理工大学研究基金资助[23.1.10]。
{"title":"Experimental and numerical studies on the effectiveness of high-strength steels protecting against API BZ projectiles","authors":"Cuong Phan Hoang, Dung Nguyen Van, Hoang Pham Quoc, Nhung Nguyen Thi Cam, Minh Phung Van, Thai Le Minh","doi":"10.1080/10589759.2023.2274005","DOIUrl":"https://doi.org/10.1080/10589759.2023.2274005","url":null,"abstract":"ABSTRACTThis paper uses numerical and experimental methods to look at how well Xar450 and Perform 700 high-strength steels protect against a 7.62 × 39 mm API BZ projectile. The numerical study of the target thicknesses varies from 3 mm to 4 mm and 6 mm. And they are struck at 0°, 15°, 30°, 45°, and 60° oblique angles. Numerical simulation results show that at a normal impact angle, the bullet can break through the Perform700 targets in all thicknesses; however, the resistance performance of the target plate increases with the rise of oblique angles. The Xar450 target plates of 4 mm and 6 mm can resist the bullet at any oblique angle, but the bullet can easily penetrate 3 mm thickness from 0° to 30° oblique angles. The experiment is based on the VPAM-APR 2006 standard. The experiment results showed that the bullet perforated through the Perform700 target plate with a thickness of 3 mm at 0° and 30° oblique angles. In contrast, the bullet cannot penetrate the Xar450 target thickness of 4 mm at a normal angle. The findings of this research are used in the formulation of the design methodology for a light armoured vehicle. Besides, they have considerable importance in the realm of calculating and developing anti-fracture structures for practical applications.KEYWORDS: 7.62x39 mm API BZ projectilenumerical simulationXar450Perform700oblique angle AcknowledgementThis research is funded by Le Quy Don Technical University Research Fund under the grand number 23.1.10.Disclosure statementNo potential conflict of interest was reported by the author(s).Data availability statementThe data that support the findings of this study are available from the corresponding authors upon reasonable requestAdditional informationFundingThis work was supported by the This research is funded by Le Quy Don Technical University Research Fund [23.1.10].","PeriodicalId":49746,"journal":{"name":"Nondestructive Testing and Evaluation","volume":"46 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136381601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-26DOI: 10.1080/10589759.2023.2273521
Weifan Zheng, Yang Cheng, Xiao Ma, Hao Sui, Jiye Zhang
ABSTRACTBy introducing the Lennard-Jones potential into the interaction of vehicles, a new cellular automata model of traffic flow is proposed, in which the fixed probability of randomisation of cellular automata is replaced by the state transition probability of cell sites. The proposed model considers that the driver is affected by the interactional potential of vehicles before him/her, and the decision-making process is related to the value of the interactional potential. The model is more suitable for the driver’s random decision-making process which is based on the stochastic behaviour of traffic flow. The fundamental diagram (flow density relationship) of the proposed model is obtained, and the complex traffic phenomenon is reproduced through numerical simulation.KEYWORDS: Traffic flow modelLennard-Jones potentialcellular automata Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported in part by the National Natural Science Foundation of China under Grant 11572264, 12172308.
{"title":"On cellular automata model of traffic flow with Lennard-Jones potential","authors":"Weifan Zheng, Yang Cheng, Xiao Ma, Hao Sui, Jiye Zhang","doi":"10.1080/10589759.2023.2273521","DOIUrl":"https://doi.org/10.1080/10589759.2023.2273521","url":null,"abstract":"ABSTRACTBy introducing the Lennard-Jones potential into the interaction of vehicles, a new cellular automata model of traffic flow is proposed, in which the fixed probability of randomisation of cellular automata is replaced by the state transition probability of cell sites. The proposed model considers that the driver is affected by the interactional potential of vehicles before him/her, and the decision-making process is related to the value of the interactional potential. The model is more suitable for the driver’s random decision-making process which is based on the stochastic behaviour of traffic flow. The fundamental diagram (flow density relationship) of the proposed model is obtained, and the complex traffic phenomenon is reproduced through numerical simulation.KEYWORDS: Traffic flow modelLennard-Jones potentialcellular automata Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported in part by the National Natural Science Foundation of China under Grant 11572264, 12172308.","PeriodicalId":49746,"journal":{"name":"Nondestructive Testing and Evaluation","volume":"53 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136382111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-25DOI: 10.1080/10589759.2023.2274001
Jianjun Zhao, Kaiyue Yang, Xiaozhong Du, Shuxin Yao, Yizhen Zhao
{"title":"Automated quantification of small defects in ultrasonic phased array imaging using AWGA-gcForest algorithm","authors":"Jianjun Zhao, Kaiyue Yang, Xiaozhong Du, Shuxin Yao, Yizhen Zhao","doi":"10.1080/10589759.2023.2274001","DOIUrl":"https://doi.org/10.1080/10589759.2023.2274001","url":null,"abstract":"","PeriodicalId":49746,"journal":{"name":"Nondestructive Testing and Evaluation","volume":"31 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135217659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-24DOI: 10.1080/10589759.2023.2273522
Ferhat Çeçen, Bekir Aktaş, Ahmet Özbayrak
ABSTRACTVibrational experimental modal analysis (EMA) is among the most widely used modal parameter estimation techniques. However, it has several drawbacks, such as requiring accelerometer(s) mounting and using local measurements. Therefore, this study investigated whether vibroacoustic modal testing (VMT), a rarely studied method, would be a suitable alternative for EMA. In this context, a comparative case study was conducted on railway sleepers. First, modal parameter determination techniques in the literature were compared (time/frequency-domain, with/without normalisation, structural/acoustic excitation, and acoustic/vibrational response). Then, VMT and EMA test setups were reorganised considering the deficiencies identified in the literature. As a result, the difference between the VMT and EMA resonance frequency and damping ratios in the proposed mode shapes is determined as 0.06% and 3.46%, respectively. Consequently, this novel VMT setup using a single microphone that can take non-destructive, non-contact, and non-local (triaxial) measurements has been proven to provide reliable results and is recommended for future studies.KEYWORDS: Experimental modal analysisnon-destructive testingfield testingresonance frequency decrease diagnosticsdamping performance inspection AcknowledgmentsThis study was supported by the Scientific Research Projects Coordination Department of Erciyes University (Project Number: FCD-2021-11483). The authors of this study express their gratitude to ERÜ/BAP for sponsoring the project.Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThe work was supported by the Bilimsel Araştırma Projeleri, Erciyes Üniversitesi [FCD-2021-11483].
摘要振动实验模态分析(EMA)是应用最广泛的模态参数估计技术之一。然而，它有几个缺点，例如需要安装加速度计和使用本地测量。因此，本研究探讨了振动声模态测试(VMT)这一很少被研究的方法是否适合作为EMA的替代方法。在此背景下，对铁路枕木进行了比较案例研究。首先，比较了文献中的模态参数确定技术(时域/频域、有/没有归一化、结构/声学激励和声学/振动响应)。然后，考虑到文献中发现的缺陷，重新组织VMT和EMA测试设置。因此，在所提出的模态振型中，VMT和EMA共振频率和阻尼比的差异分别确定为0.06%和3.46%。因此，这种新颖的VMT设置使用单个麦克风，可以进行非破坏性，非接触式和非局部(三轴)测量，已被证明可以提供可靠的结果，并推荐用于未来的研究。关键词:实验模态分析;无损检测;现场检测;本研究的作者对ERÜ/BAP对该项目的赞助表示感谢。披露声明作者未报告潜在的利益冲突。本研究由Bilimsel Araştırma Projeleri, Erciyes Üniversitesi [FCD-2021-11483]资助。
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ABSTRACTWith further research into neural networks, their scope of application is becoming increasingly extensive. Among these, more neural network models are used in text classification tasks and have achieved excellent results. However, the crucial issue of derived adversarial examples has dramatically affected the stability and robustness of the neural network model. This issue confines the further expansion of the neural network application, especially in some security-sensitive tasks. Concerning the text classification task, our proposed DAT-LP (Defence with Adversarial Training Based on Local Perturbation) algorithm is designed to address the adversarial example issue, which uses local perturbation to enhance model performance based on adversarial training. Furthermore, SW-CStart (Cold-start Algorithm Based on Sliding Window) algorithm is designed to realise adversarial training in the model’s initialisation stage. The DAT-LP algorithm is evaluated by comparing with three baselines, including baseline models (BiLSTM, TextCNN), Dropout(regularisation method), and ADT (Adversarial Training method), respectively. As it turns out, DAT-LP’s performance is superior and demonstrates the best generalisation ability.KEYWORDS: DAT-LPdefence algorithmmachine learning securityrobustnessadversarial attack Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported in part by the National Natural Science Foundation of China under Grant No. 62072319; the Sichuan Science and Technology Program under Grant No. 2023YFQ0022, 2022YFG0041, 2022YFG0155 and 2022YFG0157; the Luzhou Science and Technology Innovation R&D Program under Grant No. 2022CDLZ-6.
摘要随着神经网络研究的深入，其应用范围越来越广泛。其中，更多的神经网络模型被用于文本分类任务，并取得了优异的效果。然而，衍生的对抗示例的关键问题极大地影响了神经网络模型的稳定性和鲁棒性。这个问题限制了神经网络应用的进一步扩展，特别是在一些安全敏感的任务中。在文本分类任务方面，我们提出的DAT-LP(基于局部扰动的对抗训练防御)算法旨在解决对抗示例问题，该算法利用局部扰动来增强基于对抗训练的模型性能。设计了SW-CStart (Cold-start Algorithm Based on Sliding Window)算法，在模型初始化阶段实现对抗性训练。通过对比基线模型(BiLSTM、TextCNN)、Dropout(正则化方法)和ADT(对抗训练方法)三个基线来评估DAT-LP算法。结果表明，DAT-LP的性能更优，具有最好的泛化能力。关键词:dat - lpd防御算法机器学习安全性鲁棒性对抗性攻击披露声明作者未报告潜在的利益冲突。本研究得到国家自然科学基金项目资助(No. 62072319);四川省科技计划项目(2023YFQ0022、2022YFG0041、2022YFG0155、2022YFG0157);泸州市科技创新发展计划(2022CDLZ-6)
{"title":"Defence algorithm against adversarial example based on local perturbation DAT-LP","authors":"Jun Tang, Yuchen Huang, Zhi Mou, Shiyu Wang, Yuanyuan Zhang, Bing Guo","doi":"10.1080/10589759.2023.2249581","DOIUrl":"https://doi.org/10.1080/10589759.2023.2249581","url":null,"abstract":"ABSTRACTWith further research into neural networks, their scope of application is becoming increasingly extensive. Among these, more neural network models are used in text classification tasks and have achieved excellent results. However, the crucial issue of derived adversarial examples has dramatically affected the stability and robustness of the neural network model. This issue confines the further expansion of the neural network application, especially in some security-sensitive tasks. Concerning the text classification task, our proposed DAT-LP (Defence with Adversarial Training Based on Local Perturbation) algorithm is designed to address the adversarial example issue, which uses local perturbation to enhance model performance based on adversarial training. Furthermore, SW-CStart (Cold-start Algorithm Based on Sliding Window) algorithm is designed to realise adversarial training in the model’s initialisation stage. The DAT-LP algorithm is evaluated by comparing with three baselines, including baseline models (BiLSTM, TextCNN), Dropout(regularisation method), and ADT (Adversarial Training method), respectively. As it turns out, DAT-LP’s performance is superior and demonstrates the best generalisation ability.KEYWORDS: DAT-LPdefence algorithmmachine learning securityrobustnessadversarial attack Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported in part by the National Natural Science Foundation of China under Grant No. 62072319; the Sichuan Science and Technology Program under Grant No. 2023YFQ0022, 2022YFG0041, 2022YFG0155 and 2022YFG0157; the Luzhou Science and Technology Innovation R&D Program under Grant No. 2022CDLZ-6.","PeriodicalId":49746,"journal":{"name":"Nondestructive Testing and Evaluation","volume":"213 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134910803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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