由研究生院、党委研究生工作部主办，力学与安全工程学院承办的研究生“名师名家讲坛”，将邀请澳大利亚国立大学秦庆华（Qing-Hua Qin）教授为广大师生做专题学术报告。欢迎广大师生参加！
报告题目：Acoustic and seismic characteristics of metamaterials
报告人：秦庆华教授
报告时间：2019年12月02日16:00-18:00
报告地点：力学与安全工程学院二楼202会议室
Abstract:
A fundamental of acoustic and seismic metamaterials and its application to civil engineering is presented in this report. A category of elastic metamaterials which can be used to attenuate mechanical vibration and seismic wave is also discussed. Theoretical analysis for acoustic metamaterials shows that multiple resonant-type band gaps are obtained, in which the lower bound frequency of each band gap coincides with the resonance frequencies of the resonators. It is noted that damping has significant influence on the band gaps and the effective mass density. Specifically, damping can broaden the band gaps with the sacrifice of the deactivating the band gap effect, smooth and lower the frequency responses for the whole ranges. Comparatively, damping from the host plate can smooth and reduce the responses in low-frequency range (lower than the first band gap), while damping of the resonators can move the unbounded effective mass density region to a lower frequency and shrinks the negative-density ranges by means of damping out part of energy. Finite element simulation reveals that the metamaterial plate works on the mechanism of multiple conventional vibration absorbers generating inertia forces to counteract the bending forces induced by the flexural waves and stretching the plate within the band gaps. Practical implementation of the metamaterial plate with two different configurations is also discussed to show the potential applications for engineering.
报告人简介：
秦庆华（Qing-Hua Qin）,澳大利亚国立大学教授，长江学者特聘教授，澳大利亚国立大学工程研究中心材料加工制造组带头人。
秦庆华教授于1984年和1990年获华中科技大学固体力学专业硕士和博士学位，1994年获DAAD—王宽诚基金赴德国Stuttgart大学访问研究。1995年-1997年到清华大学开展博士后研究；1997和2002年获澳大利亚研究理事会Queen Elizabeth II研究员和Professorial Fellow，2004年至今在澳大利亚国立大学工学院担任教授、副院长(2011-2013)、研究中心材料加工制造组带头人等职位。2000年被聘为华中科技大学客座教授；2002年被天津大学聘为长江学者特聘教授。在澳期间作为主持人共获得8项澳大利亚面上基金。在应用力学领域，已发表300多篇期刊论文，出版8部专著，获得澳大利亚科学院颁发的J. G. Russell奖。
研究生院
党委研究生工作部
力学与安全工程学院
2019年11月29日
