利用FIR滤波器生成随机振动试验驱动信号的新方法

Generating the Driving Signals for Random Vibration Test by FIR Filter

阐述了一种利用有限冲击响应 (FIR)滤波器生成随机振动试验驱动信号的新方法。该方法通过设计一个FIR滤波器对白噪声序列进行滤波 ,使滤波器输出序列的功率谱密度满足试验驱动信号的要求。在随机振动试验控制中 ,将FIR滤波器和试验的受控对象组成增广系统 。

A new method is set forth for generating the driving signals for random vibration tests. The random driving signal sequence can be obtained by linearly filtering the white noise sequence using finite impulse response (FIR) filters. A forming method of the FIR filters is introduced and an example is presented to show the effects of the method. The results are satisfactory. The FIR filters system can also be combined with the tested structure to be controlled to form a broad system. It will simplify the analysis and design of the whole control system with the broad system.