Design And Research Of Hydraulic Excitation Servo System Of Monorail Rolling Vibration Test Bench

Straddle monorail train is widely used as urban rail transit in metropolitan area because of its small space,high safety factor,strong energy saving and environmental protection and low cost compared with subway.In recent years,with the increasing number of straddle type monorail trains in China,the state has put forward higher requirements in the design and acceptance process of monorail.It is proposed that the design process should not only meet the static test,but also meet the safety index under the dynamic test.Therefore,the research and construction of industry-leading straddle type monorail rolling vibration test-bed has become a hot spot Among them,the hydraulic vibration servo system is a relatively important part of straddle type monorail train test-bed,and its performance will directly affect the stability of the test-bed;compared with other mechanical structures,the hydraulic vibration servo system has a faster response,and its output displacement and force are relatively large,so it is widely used in all walks of life However,it also has some defects and limitations.In the process of work,its control presents a nonlinear state,and its control parameters are relatively uncertain,which will affect the overall control performance and accuracy of the system.Therefore,in order to improve the performance of the hydraulic excitation servo system of straddle type monorail vehicle rolling vibration test-bed,it is of great theoretical value and practical significance to design and optimize its dynamic characteristics(transient response,robustness,follow-up and overshoot,etc.).Firstly,based on the principle of hydraulic system and related theoretical basis,the structure and circuit of hydraulic vibration servo system are designed,and the components of hydraulic cylinder and servo valve are calculated and selected.The rationality of components of hydraulic vibration servo system is analyzed theoretically.Taking hydraulic vibration servo system as the research object,the system is simulated by Simulink,The classical PID is used to observe the dynamic characteristics of the hydraulic vibration servo system,which provides a contrast for the optimization of the system;the fuzzy PID,the variable structure of the synovium and the ADRC(active disturbance rejection)control strategies are proposed respectively,and the controllers with different algorithms are designed to verify the theoretical feasibility of the algorithm.Secondly,the physical simulation model of the hydraulic vibration servo system is established in Amesim software,and the relevant parameters of the components are set.In order to ensure the accuracy and feasibility of the simulation,the co simulation of Simulink and Amesim is adopted.By constructing the control strategy and framework in Simulink,the displacement output signal of the physical simulation model established by Amesim is fed back to SIMULINK for signal processing The sinusoidal signal is used as the original input of the system to study the influence of load and flow on the control effect of hydraulic vibration servo system.The results show that compared with other control algorithms,ADRC control algorithm can not only improve the transient response,robustness,tracking and overshoot of the system,but also improve the stability of the system It can effectively improve the anti-interference ability of the system.Thirdly,according to the structure of the hydraulic excitation system and its control algorithm described in this paper,the tool kit MIT(model interface)is used Toolkit)realize the joint simulation of Labview and Simulink,compile the control test platform by calling DLL files generated in Simulink in Labview,realize the real-time signal control and signal storage analysis of the excitation system by the computer system,and lay a foundation for the research and development of the hydraulic excitation system,and provide a scientific basis for the next application.Finally,using ANSYS The fluid structure coupling analysis of pipeline is carried out by workbench,and the structure and fluid grid model of pipeline are established.Based on the solid and fluid coupling analysis principle of hydraulic pipeline system,the characteristics of pipeline in free state,one-way fluid structure coupling state and two-way fluid structure coupling state are compared and analyzed,and the influence of pipeline pressure change,pipeline wall thickness,pipe diameter and pipeline material on fluid structure coupling of pipeline is analyzed It can provide theoretical basis for pipeline design.