題目：Modeling, Design and Control of Smart Structures Using FGMs & Piezoelectric Sensors/Actuators

報告人：何小橋教授（香港城市大學(xué)） 

時間：2018年12月30日（星期日） 下午15：00

地點(diǎn)：明故宮校區(qū)A18-209會議室  

主辦單位：機(jī)械結(jié)構(gòu)力學(xué)及控制國家重點(diǎn)實(shí)驗(yàn)室、航空宇航學(xué)院、航空航天交叉研究院

ABSTRACT

In this talk, we shall present a finite element (FE) model based on the classical laminated plate theory for shape and vibration control of Functionally Graded Material (FGM) plates with integrated piezoelectric sensors and actuators. The properties of the FGM plates are functionally graded in the thickness direction according to a volume fraction power law distribution. A constant velocity feedback control algorithm is used for active control of the dynamic response of the FGM plate through closed loop control. The static and dynamic responses are presented in both tabular and graphical forms for a FGM plate of Aluminum Oxide/Ti-6A1-4V material composition. Numerical results will be presented for shape control of the FGM plates under a temperature gradient by optimising (i) the voltage distribution for the open loop control, and (ii) displacement control gain values for the closed loop feedback control. The effect of the constituent volume fractions of zirconia, through varying the volume fraction exponent n, on the optimal voltages and gain values will also be discussed. Moreover, we shall discuss our recent wok on developing a nonlinear FE model for the simulation of generating a piezoelectric bistable plate. The energy harvesting of bistable plates through piezoelectric characteristic will be introduced in the talk.

ABOUT THE SPEAKER

Dr. He is a Professor at the Department of Architecture and Civil Engineering, City University of Hong Kong. He obtained his Doctor of Philosophy in Dynamics in 1998 from National University of Singapore, his Master of Engineering in computational Mechanics in 1988 from Huazhong University of Science & Technology, and his Bachelor of Engineering in Solid Mechanics in 1982 from Wuhan University of Technology. His main research interests are in smart materials and structures, multiscale modelling of carbon nanotubes and graphene sheets, and peridynamic modelling of crack growth in quasi-brittle materials. He has authored more than 150 refereed journal papers with an h-index 35 (Source: ISI Web of Science, 19/12/2018).