Study Of Dynamic Properties Of High Frequency Electro-Hydraulic Shaking Table

Shaking table is a fully shaking test machine, which is composed of shaking parts, testing parts and software analysis parts. Electro-hydraulic shaking table has been widely applied to practical industry for its eminent performance-price ratio, which is the focus of attentions in application research fields. The properties of high frequency hydraulic shaking table are high speed, easy to install and having huge force in low frequency. But some consideration should be given about its control properties, that is, its control properties are very complex.For the electro-hydraulic shaking system, servo-controller as its controlling center is especially significant. Nowadays, computer control cards have been widely used because of their cheap and convenient to compile program. But in the situation of high frequency, there are some different properties with the situation of low frequency. In view of this, this paper introduces the design of a hydraulic shaking table and compares different controllers with each other.The efforts to be shown in the paper include: building on the mathematics model of Electro-hydraulic shaking table, after the analysis of the dynamic characteristics, some conclusion have been drawn about computer control. Due to the research object we practically work over two control strategies and correspondingly scheme out two controllers, normal digital PID controller and PID controller which is based on Ziegler-Nichols parameters-adjust empiric formula; constitute entire hardware system platform and accomplish the correspond codes of the software which combine to complement its most functions; the simulation of the adjust stability of controlling system and servo trailing control has been made by MATLAB, which compares the simulation results of the behavior of PID controller and other controllers.The paper points to the matter of composition of electro-hydraulic shaking system, control methods, working theory and present some resolves, in accordance to the requirements of Electro-hydraulic shaking table servo-controller. That will be the theoretical base for the high performance shaking table design.