Design And Servo Control Study Of Single-axis High-frequency Electro-hydraulic Shaking Table

Electro-hydraulic shaking-table is the core part of most existing seismic simulation devices,it through the electro-hydraulic servo valve converts the input signal to higher power hydraulic signal output,and then drive hydraulic cylinder to make target object vibration.At present,there is a large gap between the study level of domestic electro-hydraulic shaking table and international advanced level,the rapid development of domestic geotechnical engineering construction urgently needs to carry out a more extensive and deeper research on the shaking table.This topic attempts to take the research of small and portable shaking table as a breakthrough point,and accumulate experience and technology in the construction and control strategy research of shaking table,and make a contribute to the research and development of domestic shaking table.Single axis high frequency Electro-hydraulic Shaking table is the research object of this paper.Conducting the relevant control strategy research about the problem of insufficient response speed and higher resonant peak,and try to research on the control method of waveform reproduction.Designing the mechanical structure,hydraulic system,electronic control system,finally complete the construction of the shaking table system.The research contents of this paper is divided into six chapters,it can be briefly described as follows:In chapter 1,the background and the status of seismic simulation shaking table is introduced.The development prospect and existing problems of the Electro-hydraulic Shaking Table control technology are analyzed,and the research significance and purpose of the subject is put forward.In chapter 2,Designing the working ability of the system and checking the feasibility of the overall scheme,the mathematical equations of the electro-hydraulic servo system are deduced,and the linear and nonlinear dynamic model of the system is established.In chapter 3,The mechanical structure of the excitation system is designed according to the working condition,and the stress strain and dynamic performance of the structure are analyzed and optimized,and the hydraulic system of electrohydraulic excitation device is designed by calculating the checking and working principle analysis,and the integrated optimization design is carried out.In chapter 4,Aiming at the deficiency of dynamic response performance,using control strategy to improve the dynamic performance ability based on the zero pole assignment principle of the system,and analyze the influence of the adjustment variable in turn.The frequency response estimation technology is researched,and the control strategy of signal reappearance is initially explored based on the frequency response estimation.In chapter 5,the electronic control system is designed and built,design and develop software control system,complete the construction of shaking table system.In chapter 6,The main research contents and achievements of this subject are summarized,and the problems existing in the subject and future researches are put forward.