| The vehicle active suspensioncan improve handling stability significantlyand make people more comfortably.In recent years,depth research on theory analysis of active suspension system control algorithm had been carried by domestic and foreign researchers.However,the combinational research work on active suspension control system and actuator was neglected,whichreduce the accuracy of the output control force.To solve above problems,according to comprehensively research on the development situation of vehicle hydraulic active suspension at home and abroad,a kind of hydraulic suspension system based on the hybrid control algorithm was designed in this paper.Meanwhile,the theoretical analysis and experimental research on the hydraulic active suspension system were carried out.The main works were as followed:(1)While load changes or meets road bumps,the designed hydraulic active suspension system can realize the real-time adjustmentby the vibration of body and wheel.And combined with the hydraulic principle diagram,the damping principle and concrete implementation process of hydraulic active suspension system were analyzed under the situation of body load increase,body load decrease,road bump and road potholes.(2)According to relevant literatures,the specific structure parameters of vehicle active suspension system have been calculated in detailbased on a certain SUV 1/4 vehicle model.At the same time,the calculation results were used to design and choose hydraulic components.(3)The damping effect of hydraulic system was analyzed by AMESim,including the construction of model,the values of parametersand the operation of simulation.Through the figures,the pressure relationship between damping hydraulic cylinder and the accumulator,the pressure relationship between damping hydraulic cylinder rodless chamber and rod chamber,the relationship between piston rod displacement and road displacement,damping system response speed and hydraulic damping system stability analysis were analyzed.AMESim simulation results show that: no matter that meets bumps or body load changes,the hydraulic damping system can response rapidlyand finish damping vibration in 0.5s,satisfythe design requirements.(4)According to the design requirements,hydraulic valve blockwas designed and the simulation model of valve block was built in CATIA and the stress and deformation analysis of hydraulic valve blockwereanalyzedby “analysis and simulation” module of CATIA.The maximum stress and deformation of the valve block are concentrated in the vicinity of the inlet hole P,the maximum stress is 97.3 MPa,the maximum deformation is 0.03 mm.The manifold has sufficient margin of strength,the O-ring seal would not be affected,that means the oil leakage phenomenon would not happened caused byhydraulic valve block deformation.In conclusion,the design of hydraulic manifold block is reasonable,satisfy the design requirements.(5)The layout of hydraulic components on the valve blockand the experimental equipment have been designed in CATIA.Engineering layout drawings of the active suspension hydraulic system experimental device were completed in three-dimensional modeling of CATIA.(6)The experimental equipment of hydraulic system was installed and the experiments were carried out.The experiment results show that the damping capacity of the hydraulic active suspension system can require the desired results while vehicle load increase,vehicle load decrease,road bump,road potholesand the speed of action is rapidly.The validity and feasibility of the hydraulic system were verified preliminarily.The research results show that: The hydraulic active suspension system which designed in this paper can response rapidly and reduce vibration in 0.5s when body load changes or road surface bumps,which satisfy the design requirements with stability. |
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