报告题目：Theory, Numerical Analysis and Experiments of Acoustic and Seismic Metamaterials and Metastructures
报告人：C.W. Lim（香港城市大学）
报告时间：2024年6月4号（周二）10:00
报告地点：明故宫校区A18-705会议室
主办单位：航空航天结构力学及控制全国重点实验室，智能装备动力学中心，航空学院，国合处
报告内容简介：
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 (a,b) to natural seismic metamaterials in Fig. (c,d) 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.
报告人简介：
Currently a fellow of ASME, ASCE, EMI and HKIE, Ir Professor Lim received a B.Eng. from UTM (Malaysia), M.Eng. and PhD from NUS and NTU, respectively. He was a post-doctoral research fellow at UQ (Australia) and HKU.He is currently the subject editor for JSV and AMM, joint-editor for JoMMS, Managing Editor (Asia-Pacific) for JVET, Assoc Editor for IJBC, etc. He has published one very well-selling title entitled “Symplectic Elasticity”, more than 390 international journal papers and have more than 16,000 citations. His paper has recorded over 1,350 citations since first published in JMPS in 2015. With H-Index 66, recently 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”. He delivered a plenary lecture and chair another plenary lecture at WCCM-APACM 2022. In another scientific forum of four speakers organized by Chinese Science Bulletin and broadcasted on five online platforms, Professor Lim presented the opening lecture and the forum attracted accumulatively over 30,000 audience.
