题目：Non-contactSensing forStructuralDynamicsApplications

报 告 人：Prof. Gyuhae Park                                                                                               

Professor in the School of Mechanical Engineering

at the Chonnam National University, South Korea

时间：11 月08日（周五）上午9:30

地点：明故宫校区A18 号楼529 报告厅

主办单位：国际合作交流处、机械结构力学及控制国家重点实验室、航空学院

报告简介：

Non-contactsensingforstructural health monitoringanddamagedetectionhas recentlyreceivedagreat attention. This talk presents the recent research activities in not-contact sensing at the Active Structures and Dynamics Laboratory of Chonnam National University, Korea. The first technique introduced is  an automated crack detection technique using two image processing procedures. One is evaluating the panel edge lines, whichare

extracted from a percolated panel image object. This technique does not require a reference image for defect detection. Another is based on the comparison between a reference and a test image using the local amplitude mapping. This process contains compensation for misalignment of the images, which is typical in press lines. Cracks in panel products are efficiently detected using these two image processing Algorithms. The second technique is a laser-scanning based damage detection and visualization on a plate-like structure, which utilizes the full wavefiled measured by a Laser Doppler vibrometer (LDV) with a mirror-tilting device. A mounted piezoelectric actuator provides an excitation of either standing or traveling waves, and a LDV is used to subsequent responses. Mapping processes based on local wavenumber filtering is then carried out for damaged area visualization. Several signal processing techniques, damage mapping, integration of standing and traveling waves are presented along with several experimental results and future researchissues.

报 告 人 简 介 ：

Dr. Gyuhae Park is currently a professor of the School of Mechanical Engineering at Chonnam National University, Korea. Prof. Park received his Ph.D. in Mechanical Engineering (ME) from Virginia Tech, USA, in 2000 and his B.S. in ME from Chonnam National University, Korea in 1992. His general research interest lies in active material systems and smart structures, vibration/noise analysis and control, structural health monitoring (SHM), mechatronics, self-repairing structural systems, and energy harvesting. Prof. Park has published

more than 400 technical publications, including 100+ referred journal articles, 10+ book chapters, and 300+ conference proceedings. He is currently serving as an associate editor for Journal of Intelligent Material Systems and Structures, Journal of Vibration and Control, International Journal of Structural Health Monitoring, and Structural Monitoring and Maintenance, and is a member of ASME technical committee on adaptive structures and materials systems. Prof. Park has also actively participated in international conference activities, including serving as a Conference Chair of the Conference on Active and Passive Smart Structures and Integrated Systems III (for 2015 – 2017), as part of SPIE’s annual Smart structures/NDE Symposium. He received several international awards, notably won the SHM Person-of-the-Year Award at the 2007 International Workshop on Structural Health Monitoring at Stanford University. Dr. Park is elected a Fellow of American Society of Mechanical Engineers (ASME) in2017.