用于空腔振荡控制的压电激励器设计与试验

Design and Experiment of Piezoelectric Actuator for Cavity Oscillation Control

空腔流激振荡在航空领域比较常见,它会产生巨大噪声,危害结构安全,影响有效载荷投放。基于压电激励器的主动控制方法是抑制空腔振荡的有效措施之一。通过对压电激励器的结构和加载方式进行分析,基于压电方程和材料力学理论,获得了压电激励器的准静态响应位移模型和固有频率模型,并对压电激励器进行了优化设计。通过搭建试验平台,对压电激励器的特性进行试验。采用PID控制器进行了压电激励器的主动振动抑制试验,结果表明,设计的压电激励器性能优良,可较好地抑制振动。

Flow-induced cavity oscillation is common in the aviation field, which can generate large noise, cause damage to the structure, and influence the store separation of aircrafts. Active control method based on piezoelectric actuator is a promising method in damping the oscillation within the cavity. Firstly, the structure and power loading method of the piezo- electric actuator are analyzed, and quasi-static response and natural frequency of the piezoelectric actuator are obtained based on the knowledge in piezoelectric equations and material mechanics. Moreover, the structure of the piezoelectric actuator is optimized. In addition, the experimental setup is conducted to test the characteristics of the piezoelectric actuator. Finally, active vibration suppression experiment with piezoelectric actuator based on PID controller is conducted. The experimental results demonstrate that the designed piezoelectric actuator show good performance, and vibration is damped effectively when using piezoelectric actuator.