基于同位加速度负反馈的振动主动控制研究

基于同位加速度传感/压电驱动的反馈方法，对用扬声器进行声激励的四面固支铝板开展多模态振动主动控制研究。根据实验模态分析的结果，确定了传感和驱动的位置。经过压电片传感/压电片驱动和加速度传感/压电片驱动两种方案的对比，选择了能观性和能控性较好的加速度传感方式。在正位置反馈控制律（positive position feedback,简称PPF）的基础上，以加速度信号进行反馈控制律的设计，提出基于加速度负反馈控制方案 (negative acceleration feedback,简称NAF)，并对其进行稳定性和控制机理分析。控制时以加速度信号作为评价指标，对64和158 Hz两个模态分别进行单模态和多模态控制。结果表明，基于加速度的反馈控制可以大幅度降低铝板的振动，最大控制效果可达11 dB，远大于PPF的控制效果，对单模态和多模态均能实现有效的振动控制。

Active Control of Vibration Using Collocated Negative Acceleration Feedback Strategy

A collocated accelerometer sensing and piezoelectric actuating strategy is proposed for active vibration control. The target to be controlled is a clamped-clamped aluminum plate with acoustic excitation. An experimental system is designed to exert acoustic excitation on this plate. Based on the experimental modal test results, sensor and actuator locations are determined. Collocated accelerometer/piezoelectric patch and collocated piezoelectric patches are compared, and the acceleration sensing is selected due to good observability and controllability. According to positive position feedback (PPF) control law, a negative acceleration feedback (NAF) control law is proposed and the stability and control mechanism are analyzed. The acceleration level is selected as the judging criteria, and active control is targeted for two modal frequencies 64 Hz and 158 Hz simultaneously. The effectiveness of PPF control and the NAF control are compared. Experiment results show that the NAF control law can effectively suppress the vibration level of the aluminum plate by 11 dB, which is much more effective than the results from PPF control result.