Research On Seismic Simulation Control Technology And Algorithm Of Six-degree-of-freedom Shaking Table System

As the basic equipment to detect the seismic performance of structure,seismic simulation shaking table can accurately simulate the seismic waveform and reproduce the artificial waveform,and directly reflect the failure mechanism of the building structure under the earthquake action,so as to provide theoretical basis for effective structural seismic design.Modern buildings have higher requirements for structural seismic resistance,and the traditional small vibration table can not meet the seismic testing conditions of complex structures.The three-direction six-degree-of-freedom large-scale seismic shaking table can realize the movement output in three coordinate directions,which could provide more driving force to meet the testing requirements of large-scale components.It provides more realistic response of building structures in seismic waveform.Electro-hydraulic servo system is the core of the vibration table,and its control accuracy determines that the control performance is good or bad.How to improve the control precision of servo system with nonlinear and time-varying characteristics has been a hot topic.In order to meet the requirement of large-scale seismic performance test,this topic set up the whole frame structure of the vibration table and analyzed the stability of the servo system.By designing the three-state controller,it expands the system bandwidth and the system damping ratio,which part is benefit to enhance the vibration table robustness.The relationship between the DOF variables of spatial motion and the displacement variables of the each exciters is transformed by using the DOF synthesis matrix or decomposition matrix.For the internal force of the vibration table with redundant driving structure,the pressure stabilizer is used to weaken the internal force caused by the exciters during the operation of the platform.According to method of the vibration platform motion control,the advantages and disadvantages of the electro-hydraulic servo system with intelligent control algorithm in the control precision and stability are analyzed through simulation test under different system input conditions.In the last part,designing the the man-machine interface of shaking table test to facilitate operation flow,which improves the data analysis ability.