Research On Hydraulic Servo System Of Lateral Deviating And Banking Action Of Low-Speed Motor Testing Machine

The low speed motor tire testing machine studied in this thesis is equipment which can obtain performance parameter of motor tire in low speed condition. This equipment consist of actuator, hydraulic circuit and electro-controller, that make up a closed-loop system to achieve vertical, lateral deviation and banking loading action. Considering control precision, response speed and overcome disturbance and non-linearity, the control strategy was studied significantly in this thesis.The lateral deviating and banking electro-hydraulic servo system was studied in this thesis, obtain the characteristics under typical input signal, which is useful to design, manufacture and debug of testing machine. The transfer function of symmetry valve control asymmetry cylinder was deduced, the linear model of system was build up under classical control theory, and the non-linear model of system was build up under modern control theory. According to practical situation of tow system, the linear model and the non-linear model was studied separately using SIMULINK software, and did the comparing analysis with the simulating result, simulating result represented that: the linear model transition time was short, had no overshoot, the response curve was better than non-linear one; If the pressure of the cylinder can not make spool and plunger synchronism, that will create impaction, that will increase with frequency of input signal rise; The valve control asymmetry cylinder will arise low pressure and zero-pressure phenomenon with triangular signal.According to following analysis, the author designed the numerical controller of the testing machine with Visual Basic program language, the practical testing result justified the system's model was correct, and acquired the satisfied control effect.