报告题目：Theory, Numerical Analysis and Experiments of Acoustic and Seismic Metamaterials and Metastructures
报告时间：2026年1月16日，15：00-16：30
报告地点：龙赛理科楼南楼519会议室
主讲人：C.W.Lim教授
摘要：
The recent surge in the number of studies on seismic metamaterials is testimony to the fact that the concept of photonic crystals, phononic crystals and acoustic metamaterials is no longer limited to basic theories and dynamic characteristics. Apart from the peculiar observation including negative stiffness, negative mass density negative refraction properties, etc., auxetic metamaterials that govern negative Poisson’s ratio, nonreciprocal wave phenomena, origami/kirigami effects also find potential applications in geophysics and earthquake engineering. Except man-made synthetic resonators/metastructures, recently forest trees at geophysical scale are reported as naturally available seismic metamaterials with capability to mitigate ground born ambient vibrations and incoming seismic waves at subwavelength frequency region. The work to be presented here elaborates a class of materials and structures ranging from engineered phononic crystals and acoustic metamaterials in Fig to natural seismic metamaterials in Fig. that show exotic yet with outstanding application potentials. Besides discussing the peculiar yet wonderful wave propagation characteristics of periodic structures for wave active control, topological protected interface modes, etc., the exciting wave dispersion response that found applications for manipulation Rayleigh wave and possible forestation as a means for geographical regional isolation against ground surface wave motion will also be presented.
主讲人简介：
Currently a fellow of ASME, ASCE, EMI, HKIE, and a member of the European Academy of Sciences and Arts (2025), Professor Lim was awarded the prestigious 2020 JN Reddy Medal as a recognition “for significant and original contributions to vibration of plates and shells, smart piezoelectric structures, nanomechanics, and symplectic elasticity”, and also Changjiang Chair Professorship. Professor Lim received a B.Eng. from University of Technology of Malaysia, M.Eng. and PhD from National University of Singapore and Nanyang Technological University, respectively. Prior to joining City University of Hong Kong, he was a post-doctoral research fellow at The University of Queensland and The University of Hong Kong. He is also a visiting professor at various universities worldwide. He has expertise in theory of plates and shells, dynamics of smart piezoelectric structures, nanomechanics, metamaterials and symplectic elasticity. He is currently the subject editor for Journal of Sound and Vibration, joint-editor for Journal of Mechanics of Material and Structures, subject editor for Applied Mathematical Modelling, Managing Editor (Asia-Pacific Region) for Journal of Vibration Engineering & Technologies, Associate Editor for International Journal of Bifurcation and Chaos, etc. and also on the editorial board of some other top-ranked international journals. He has published one very well-selling title entitled “Symplectic Elasticity”, co-authored with W.A. Yao and W.X. Zhong from Dalian University of Technology, as recorded by the publisher, World Scientific, in Engineering Mechanics and Mechanical Engineering. He has published more than 430 international journal papers and have more than 20,000 citations. His paper on the nonlocal strain gradient theory has attracted over 1,822 citations since first published in 2015. Recently he was elected by secret votes to deliver a Plenary Lecture at WCCM/APCOM 2022, the largest biennial meet for computational scientists worldwide. He was also invited to chair another plenary lecture. WCCM 2020 recorded over 400 mini-symposia and over 5,000 papers accepted. He was also previously awarded Top Referees in 2009, Proceedings A, The Royal Society. Professor Lim is a registered professional engineer in Hong Kong.
