压电主动振动控制系统受噪声影响时域仿真研究

A Time Domain Method for Noise Impact Study of Piezoelectric Active Vibration Control System

目的基于逆压电效应的热弹性比拟原理,提出压电主动振动控制系统噪声时域的研究方法。方法首先建立压电结构系统的状态空间模型,选择一定的控制策略设计控制器,然后考虑压电控制系统噪声干扰问题进行控制系统闭环仿真,考察不同测试噪声水平对振动控制效果的影响。结果算例结果表明,采用神经网络(NNP)控制策略实施振动控制时,50 Hz工频噪声对控制效果影响不大。结论该方法可方便地考虑各种实际噪声情况,快速直观地给出噪声对控制效果的影响。

Objective To develop a time domain method for the study of measurement noise impact on the control efficiency of piezoelectric vibration control system based on thermal analogy method. Methods The state-space model of the piezoelectric structure was established firstly and certain control strategy was selected to design the controller,then the close-loop stimulation of the control system was made considering the issue of interruption of the control system by noise to investigate the influences of different noise levels on the piezoelectric vibration control system.Results Simulation results demonstrated that 50 Hz industrial frequency noise had little influence on the control effect when the neural network control strategy was used to implement vibration control. Conclusion The method can deal with various noises, and rapidly and visually show the noise influence on control effect.