Fuzzy Control Research Of The Earthquake Simulation Shaking Table

Electro-hydraulic servo control system is core part in earthquake simulation shaking table. 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. And servo-controller as its controlling center is especially significant. Electro-hydraulic servo-system is essentially non-linear control system, which effect of controlling relies on the precision of linearization and the operational point. The parameters or the whole structure of the controller must be redesigned when the operational point changes. So, the design of controller from the angle of intelligent control is presented in this paper to extend greatly the operational space of the controller.The background and significance of thesis are introduced. The state-of-the-art research for earthquake simulation shaking table, Electro-hydraulic servo control technology, the developing history and properties of the Fuzzy control are summarized. The linear mathematics model of Electro-hydraulic shaking table is set up. The non-linear characteristic is advanced by analysizing of the dynamic characteristics of Electro-hydraulic servo control system. The PID controller based on Ziegler-Nichols parameters-adjust experiential formula and fuzzy controller is designed according to the characteristic of Electro-hydraulic servo control system and research object. The wave recurrence and control effect for PID controller and Fuzzy controller is simulated and compared using Matlab/Simulink tools.The research of intelligent control of shaking table is a new project, which achievement is used for the development of the shaking table control technology. The new resolution method is advanced according to the control requirements of Electro-hydraulic shaking table. However, there is still much work for us to constitute a complete set of servo controller in our future research.