一种非平稳随机振动试验控制系统设计

目的 实现非平稳随机振动试验控制,在传统随机振动试验控制理论基础上,提出一种针对非平稳连续振动方式下的随机试验控制方法.方法 将均方根时变的非平稳随机振动过程近似等效为一个均方根和PSD谱的乘积模型,通过实时计算归一化的驱动谱,利用均方根实时跟随控制策略,更新驱动信号,实现连续非平稳随机振动控制.利用软件编程实现控制算...

A Control System Design of Non-Stationary Random Vibration Experiment

To control the non-stationary random vibration system, based on the traditional control theory of random vibration experiments, a new control for the random experiments was proposed in the condition of non-stationary continuous vibration. The non-stationary random vibration process of time varying Root Mean Square (RMS) was approximately equivalent to a product model of RMS and PSD spectrum. The normalized driving spectrum was calculated in real time, and the driving signal was updated by root mean square real-time following control strategy to realize continuous non-stationary random vibration control. The control arithmetic actualized through software program, and designed a control system of non-stationary random vibration experiments by Industrial Personal Computer, embedded real-time controller, data acquisition module. The control system was connected with the shaking table test system to carry out the verification test. Results showed that the normalized PSD spectrum control precision was less than ±3 dB, and the control effect and accuracy can meet the design requirements. In conclusion the designed control system can synchronously follow and keep the reference RMS with a design-satisfied control effect.