自传感主动式减振控制

本文介绍一种用单块压电材料同时实现传惑和执行功能的方法。其本质在于利用数字信号处理器(Digital Signal Processor简称DSP)测量出执行器的应变作用。本文从压电材料的机电状态方程和电路理论方面对此方法进行了阐述。 本文同时介绍一种在周期性振波动情况下,寻找反振波的最佳相位和放大系数的方法。 在自由传感执行器,钢条,DSP等组成的试验系统中,可将钢条的振动幅值减小10分贝。

Active Damping Control with Self-Sensing Actuator

All approach which realizes a single piezoelectric material to sense and actuate concurrently is int roduced. A simple series circuit with DSP (Digital Singal Pro-cessor)is used to measure strain in the self-sensing actuator. The method is expounded in terms of the electromechanical constiturive eguation for a piezoelectric material and electric circuit theory.The optimal parameter search method can search optimal phase and amplification coefficients for periodic vibration damping.In the steel beam system with self-sensing actuator and DSP,the amplitudes of vibration in beam can be faded by 10 dB,using the optimal parameter search or PD algorithm.