基于分时复用压电自感知执行器的悬臂梁振动主动控制研究  

Active vibration control of a cantilever beam using piezoelectric self-sensing actuator in time-sharing fashion

作　　者：董维杰[1] 贾艳丽[2] 杨明刚[2] 

机构地区：[1]大连理工大学电子与信息工程学院,大连116024 [2]淮安信息职业技术学院电子工程系,淮安223003

出　　处：《振动与冲击》2009年第10期150-153,共4页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(50305001)

摘　　要：提出了使压电陶瓷传感器在采样间隔内作执行器、并应用于振动主动控制的方法。一个传感执行周期包含传感时隙、执行时隙和放电时隙,依次进行振动测量、振动控制和释放残留电荷。由时序电路控制三个时隙的切换,论述了时序设计和开关选取等技术细节。实验证明了传感功能和执行功能在时间上的切换不影响压电元件的传感效果,执行能力取决于执行时隙与传感执行周期之比。在对悬臂梁进行模态分析的基础上,采用独立模态控制和线性二次型最优控制算法,将分时复用的压电传感器和执行器用于悬臂梁一阶模态的振动主动控制,结果表明控制后悬臂梁的振动衰减时间缩短为控制前的20%。A method that a piezoelectric ceramic sensor was also used as an actuator during the sampling intervals in the application of active vibration control was proposed.A sensing-actuating period consists of sensing timeslot,actuation timeslot and discharge timeslot.In the three timeslots,vibration measurement,vibration control and releasing the residual charge were implemented,respectively.A sequential circuit controlled the switching of the three timeslots.Technical details,such as,sequential logic design and switching circuit were discussed.Experiments proved that the switching between sensing and actuation did not affect the function of a piezoelectric sensor.In addition,the actuation capability depended on the actuation timeslot percentage of the sensing-actuating period.Based on cantilever's modal analysis,the first modal control of a cantilever beam with independent modal control and linear quadratic optimal control algorithms was implemented by using piezoelectric sensor and actuator in time-sharing fashion.The experimental results proved that the decay time of the controlled cantilever beam reduced to 20% of the uncontrolled one.

关 键 词：分时复用 自感知执行器 独立模态 悬臂梁 

分 类 号：TP212.12[自动化与计算机技术—检测技术与自动化装置] TB53[自动化与计算机技术—控制科学与工程]