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Nonlinear Features of Ultrasonic Guided Waves for Non-destructive Evaluation of Structures
发布时间:2019-10-16 09:54:19 2537

演讲人Speaker:Dr Alex Ching-Tai Ng

题目Title:Nonlinear Features of Ultrasonic Guided Waves for Non-destructive Evaluation of Structures

时间Date:2018年10月17日    Time:11:00-12:00

地点Venue:哈工大校区A507

内容摘要(Abstract):

Non-destructive evaluation (NDE) and structural health monitoring (SHM) of structures overs their lifetime to reduce life cycle costs, provide early detection of defects, and improve reliability and sustainability of the structures, is of vital importance in many engineering fields, such as civil, aerospace and mechanical engineering. Ultrasonic guided waves have attracted significant attention in the area of NDE and SHM over the last two decades because of their high sensitivity to small and different types of defects, ability to inspect relatively large area, and flexibility of implementing on structures using a wide range of standard and build-in transducers.

Recent developments of nonlinear ultrasonic guided wave techniques have attracted significant research interests in detection and identification of damage. Different to linear ultrasonics, nonlinear ultrasonic guided waves contain the information of interests at frequencies different from the excitation frequency. It has been proved that nonlinear features of ultrasonic guided wave are sensitive to damage in materials so they can be used for early damage detection. This talk presents a background of the nonlinear ultrasonic guided waves, and provides an overview of studies and techniques devoted to developments of this technology for damage detection. It also outlines the work carried out by the speaker and his associates on the physical understanding, theoretical developments and applications of the nonlinear features of ultrasonic guided waves in damage detection.

个人简介(About the speaker):

Dr Alex Ching-Tai Ng is Director of Graduate Studies in Faculty of Engineering, Computer and Mathematical Sciences, and Associate Professor in School of Civil Environmental & Mining Engineering at The University of Adelaide. He received his B.Eng and M.Phil from City University of Hong Kong, and Ph.D from The University of Queensland. 

His research interest has been in the areas of structural health monitoring, non-destructive testing, smart materials and structures, and vibration testing. He leads a research group focusing on developments of guided wave and vibration techniques for structural health monitoring and damage identification at The University of Adelaide. He has published over 100 refereed journal and conference papers. He is Associate Editor and member of Executive Committee for Structural Health Monitoring An International Journal, and Associate Editor of Engineering Structures.

He is an elected member of Executive Committee of Australian Network of Structural Health Monitoring (ANSHM) and Council Member of International Society for Structural Health Monitoring of Intelligent Infrastructures (ISHMII). He is member of National Committee on Applied Mechanics (NCAM), Engineers Australia. He was the recipient of The Nishino Prize at 2016 East Asia-Pacific Conference on Structural Engineering and Construction, 2013 Australian Research Council Discovery Early Career Award.