Key Technology Of Control System Of Double Shaking Tables Platform For Vibration Simulation

This research is from the project "Vibration Control of the Large Scale Structural Dynamic Testing System Based on the Multiple Shaking Tables", which is funded by the Natural Science Foundation of China (NSFC). This paper aims at developing the control strategy of a two shaking table array system, especially the study of two degrees of freedom (2-DOF) redundant hydraulic shaking table system.Vibration environment simulation is a basic experimental method in modern engineering technology. In experiments, related devices combined with proper control strategy are employed, under a certain condition, to simulate the shaking environment in which the mechanism works, in order to test its capability. As the scale of mechanism along with complexity of shaking environment increase, a single small-scale shaking table cannot meet the practical demand. Nonetheless, thanks to the redundant shaking table and table-array systems, obstacles such as lack of impetus and mechanism’s irregular vibration can be got over, hence a far more complex vibration environment can be simulated.In this paper, a servo controller design for 2-DOF redundant driven shaking table is presented:by using a DOF control strategy, the control of the shaking table in both 2-DOF directions is realized; by implementing a redundant force control strategy, the control of the redundant force is realized, meanwhile the internal force coupling issue is solved; by employing a three-variable control strategy, the vibration frequency width, the damping ratio and the systematic robustness have been enhanced. The validity of the proposed design is first tested by using a hybrid simulation method (Simulink for control system and SimMechanics for kinetic system), then examined by experiments.The purpose of this paper is to realize synchronous control of the two shaking table array system. A hybrid methodology is proposed to verify the feasibility of the synchronous control design:Simulink for the control system, AMESim for hydraulic system, ADAMS for kinetic system. Finally, a two shaking table experiment system is introduced, then is used to examine the validity of the design. Results demonstrate the validity of the proposed design.