基于系统辨识的宽频大尺寸振动台正弦扫频控制

作者：孙明,沈润杰,郭吉丰,朱春鹏 日期：2008-06-23/span> 浏览：4303 查看PDF文档

基于系统辨识的宽频大尺寸振动台正弦扫频控制

孙明,沈润杰,郭吉丰,朱春鹏
（浙江大学 电气工程学院，浙江 杭州 310027）

摘要：宽频大尺寸振动台在其频率范围内具有复杂的动态特性,一般的控制方法很难实现高精度的扫频控制。提出了基于系统辨识的正弦扫频控制方法，首先对振动台进行了系统辨识分析，求出了振动台在指定频率范围内的幅频响应函数，据此得出了系统在每个频率点的输入，然后进行了正弦扫频，按照一定的规律改变频率，保持振幅不变；扫频过程中结合分段PID算法，对控制中出现的误差进行了实时修正，从而保证了正弦扫频的精度。最后给出了运用该方法对宽频大尺寸振动台进行控制的实验结果。结果表明，这种控制方法可以实现宽频大尺寸振动台高精度的扫频控制。
关键词：宽频大尺寸振动台；系统辨识；正弦扫频控制；比例积分微分
中图分类号：TB534+.2文献标识码：A文章编号：1001-4551(2008)06-0095-02

Sine wave sweep control for wideband jumbosize vibration system based on system identification
SUN Ming, SHEN Runjie, GUO Jifeng, ZHU Chunpeng
(College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)
Abstract: The control system of the vibration system should realize precision control on complex dynamic situation, especially for wideband jumbosize vibration system. The sine wave sweep control based on system identification was introduced. It could simply be described as analyzing the system identification, resolving the response in the appointed waveband and gain the input in each test point first, then the sweep control kept the magnitude fixed and changed the frequency according to regular pattern. PID arithmetic was adopted to increase the level of accuracy and antidisturbance. At last the data gained in the experiment was presented. According to the result, the control method could properly be used for the wideband jumbosize vibration system.
Key words: wideband jumbosize vibration system; system identification; sweep control; proportionintegralderivative (PID)