Research on Signal Separation of Self-sensing Piezoelectric Actuators
Piezoelectric elements,serving as both sensors and actuators,have been proved to be one of the most practical materials for active vibration control(AVC).To reduce the number of piezoelectric elements in an AVC system,self-sensing piezoelectric actuators(SSA)are explored,which are capable to pickup vibration signal while actuating the structure.However,successful use of SSA relies on well distinguishing the signal to be measured from the controlling outputs,which are always mixed together.A specially designed electric circuit,typically,a bridge circuit,is required to realize the concept.However,precise equilibrium of the bridge circuit is extremely difficult to obtain because of the continuous changes of the environmental conditions.This will degrade the system performance or even destabilize the closed loop control system.In this paper,a self-adaptive compensation method is present.The adaptive algorithm is written in program C based on TMS320F2812.For validation,an AVC system employing SSAs is setup,relevant experiments are then carried out,which shows that changes of the piezoelectric capacitances have little influences on the structural vibration control performance when SSAs are used in this AVC system.
Self-sensing actuator active vibration control PZT adaptive compensation
Qiang Liu Renwen Chen Baocheng Gu
The Aeronautical Key Lab.for Smart Materials & Structures,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,P.R.China
国际会议
The World Forum on Smart Materials and Smart Structures Technology(SMSST07)(2007年世界智能材料与智能结构技术论坛)
重庆·南京
英文
2007-05-01（万方平台首次上网日期，不代表论文的发表时间）