• CN:11-2187/TH
  • ISSN:0577-6686

›› 2002, Vol. 38 ›› Issue (7): 80-83.

• 论文 • 上一篇    下一篇

基于状态观测器的压电自感知执行器研究

董维杰;孙宝元;崔玉国;杨志欣   

  1. 大连理工大学机械工程学院
  • 发布日期:2002-07-15

STUDY ON OBSERVER BASED PIEZOELECTRIC SELF-SENSING ACTUATOR

Dong Weijie; Sun Baoyuan; Cui Yuguo; Yang Zhixin   

  1. Dalian University of Technology
  • Published:2002-07-15

摘要: 压电执行器存在迟滞非线性,常需要附加位移传感器以组成闭环校正。拟用执行器自感知位移和力,省去外部传感器。对压电双晶片执行器设计了电压驱动电路,同时用积分电路获取其上电荷的复合电路。基于此电路,无外载荷下,执行器可以自感知位移;有外载荷下,采用状态观测器方法,执行器可估计自身结构位移和应力,观测器中用广义Maxwell滑动模型描述迟滞以补偿迟滞非线性。基于观测器的自感知方法避免了电桥法自感知电路阻抗不易匹配的问题。试验证明了上述方法用于压电自感知位移执行器的有效性。

关键词: 电荷驱动, 压电陶瓷, 执行器, 状态观测器/自感知执行器

Abstract: Piezoeleclric actuators often work in a close-loop feedback position control system due to hysteresis. The objec-tive is to make an actuator self-sense its output force and dis-placement \vithout using extra sensors. The technique is termed self-sensing actuator/actuation (SSA). A compound circuit is proposed to voltage-drive the piezoelectric actuator and get the resuiting charge concurrently. Based on the circuit, the un-stressed actuator can self-sense its free strain. If the actuator is externally stressed, an Observer is construcied to estitnate the actuator's stress and strain state. The observer-based self-sensing approach depends on tlie fact that the electric field is controllable and the electric displacement is measurable. In order to cornpensate hysteresis, voltage versus charge relation is modeled using generalized Maxwell slip (QMS) model, and the observer is improved to a nonlinear one. The observer-based SSA approach successfiilly bypasses the impedance mismatch-ing problem bothering the bridge-based SSA approach. The self-sensed average strain of piezoelectric bimorph is coincident with the tip displacement measured by proximitor.

Key words: Piezoceramics Actuator State observer/Self-sensing actuator

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