一种非平稳随机振动试验控制系统设计  

A Control System Design of Non-Stationary Random Vibration Experiment

作　　者：邓婷[1] 严侠[1] 王宇飞[1] DENG Ting;YAN Xia;WANG Yu-fei(Institute of Systemic Engineering,China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]中国工程物理研究院总体工程研究所,四川绵阳621900

出　　处：《装备环境工程》2022年第3期94-100,共7页Equipment Environmental Engineering

基　　金：国防科工局技术基础科研项目(JSHS2018212C001)。

摘　　要：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法和策略,并基于工控机、实时控制器、数据采集模块等硬件,设计一套非平稳随机振动试验控制系统。将该控制系统与振动台试验系统连接,开展时变随机功能验证试验。结果 归一化后的PSD谱控制误差在±3 dB范围内,控制效果和精度能够满足设计要求。结论使用所设计的控制系统开展非平稳随机振动试验是可行的,能够实现对参考时变均方根曲线的实时跟随控制。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.

关 键 词：非平稳 随机振动 均方根时变 归一化 控制系统 

分 类 号：TP20[自动化与计算机技术—检测技术与自动化装置]