检索结果-南通市图书馆

Detection of damage locations and damage steps in pile foundations using acoustic emissions with deep learning technology

在线全文

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2021年第2期15卷 318-332页

作者： Alipujiang JIERULA Tae-Min OH Shuhong WANG Joon-Hyun LEE Hyunwoo KIM Jong-Won LEE School of Resource&Civil Engineering Northeastern UniversityShenyang110819China School of Mechanical Engineering Pusan National UniversityBusan46241Korea Department of Civil and Environmental Engineering Pusan National UniversityBusan46241Korea Korea Institute of Geoscience and Mineral Resource(KIGAM) Daejeon34132Korea

The aim of this study is to propose a new detection method for determining the damage locations in pile foundations based on deep learning using acoustic emission ***,the damage location is simulated using a back propagation neural network deep learning model with an acoustic emission data set acquired from pile hit *** particular,the damage location is identified using two parameters:the pile location(PL)and the distance from the pile cap(DS).This study investigates the influences of various acoustic emission parameters,numbers of sensors,sensor installation locations,and the time difference on the prediction accuracy of PL and *** addition,correlations between the damage location and acoustic emission parameters are ***,the damage step condition is determined using a classification model with an acoustic emission data set acquired from uniaxial compressive strength ***,a new damage detection and evaluation method for pile foundations is *** new method is capable of continuously detecting and evaluating the damage of pile foundations in service.

关键词： pile foundations damage location acoustic emission deep learning damage step

location of micro-cracks in plates using time reversed nonlinear Lamb waves

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第5期29卷 311-317页

作者： Yaoxin Liu Aijun He Jiehui Liu Yiwei Mao Xiaozhou Liu Key Laboratory of Modern Acoustics Institute of Acoustics and School of PhysicsNanjing UniversityNanjing 210093China Key Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing 100190China School of Electronic Science and Engineering Nanjing UniversityNanjing 210023China

A promising tool to detect micro-cracks in plate-like structures is used for generating higher harmonic Lamb *** this paper,a method combining nonlinear S0 mode Lamb waves with time reversal to locate micro-cracks is presented and verified by numerical *** different models,the contact acoustic nonlinearity(CAN)model and the Preisach-Mayergoyz(PM)model,are used to simulate a localized damage in a thin *** inversion method is employed to extract the second and fourth harmonics from the received *** reversal is performed to compensate the dispersion of S0 mode Lamb ***,the higher harmonics generated from the damaged area can be refocused on their *** investigating the spatial distribution of harmonic wave packets,the location of micro-cracks will be *** numerical simulations indicate that this method gives accurate locations of the damaged area in a ***,the PM model is proved to be a suitable model to simulate the micro-cracks in plates for generation of higher harmonics.

关键词： Lamb waves higher harmonics time reversal damage location

Visualization location in Q235B Steel Structure by Using the Acoustic Emission Tomography

在线全文

学校读者我要写书评

暂无评论

Journal of Mechanics Engineering and Automation 2017年第1期7卷 12-16页

作者： Yu Jiang Zhong Yang Feiyun Xu Bingsheng Xu Antolino Gallego College of Intelligent Science and control Engineering Jinling Institutes of Technology Nanjing 211169 China School of Mechanical Engineering Southeast University Nanjing 211189 China School of Science Nanjing Tech University Nanjing 211800 China School of Building Engineering Campus Fuentenueva University of Granada Granada 18071 Spain

AET （acoustic emission tomography） is a new visualization location method for inspecting and locating the intemal damages in the structures. In this paper, the AET is applied to detect and visualize damage source locations in the Q235B steel structure to validate its effectiveness. Firstly, the ABAQUS/Explicit simulation *** the steel structure with one damaged circle in its center is built. And then, the simulated AE signals are obtained to establish the AE tomography. The results show that the damaged circle in the created model can be visualized clearly with the AET in its original location. Finally, the damage source location based on AET is compared with the traditional TOA （time of arrival） location method, and the better location accuracy is obtained. And this fact that further illustrates the AET has a great potential in the application of structure damage detection.

关键词： AET damage location visualization.

Experimental damage Identification Using Modified Mode Shape Difference

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Marine Science and Application 2011年第2期10卷 150-155页

作者： Ahmed A. Elshafey H. Marzouk M. R. Haddara Civil Engineering Department Faculty of Engineering Memorial University Department Civil Engineering Faculty of Engineering Architecture and Science Ryerson University Department Naval Architecture Faculty of Engineering and Applied Science Memorial University

An experimental program was undertaken to test the feasibility to detect the occurrence of structural damage using a modified mode shape difference technique. The vibration response of a steel beam fixed at one end and hinged at the other was obtained for the intact and damage conditions. Modal analysis was performed to extract the frequencies and mode shapes. The method shows a good potential in detection of occurrence and location of damage.

关键词： mode shape damage detection damage location modal analysis