Development And Performance Analysis Of Hybrid Energy Recovery Shock Absorber Test-Rig

Traditional dampers convert vehicle vibration into heat dissipation,which not only affects the performance of dampers,but also causes waste of resources.If these dissipated energy is recycled,it can not only reduce the energy consumption of vehicles,but also help to improve the driving distance.There is a big difference in working principle between energy-feedback damper and traditional damper.The damp force of energy-recovery damper comes from the resistance of hydraulic components carried by itself and the back electromotive force of generators.It can save energy and reduce emissions.However,there is no practical energy recovery scheme for shock absorber,which is still in the stage of theoretical analysis and experimental research.Therefore,it is necessary to build a suitable excitation device to test the damping characteristics and passive energy consumption characteristics of the energy recovery shock absorber,in order to find a way to reduce the no-load damping force of the energy recovery suspension,improve the energy recovery efficiency.And collect the measured data to provide support for the further application of the vehicle.The subject refers to the experimental conditions of the energy-feedback damper used in the bench test process.The relevant excitation devices are built,and the performance of the energy-feedback shock absorber is studied and analyzed through simulation and prototype test.This paper mainly carries out the following research work:Firstly,according to the national standard of shock absorber test,the main working performance of the excitation device is determined,and the experimental device of the excitation platform is built according to the determined performance parameters.The appropriate performance components are selected for the excitation platform,and the excitation platform is deployed and installed.During the test operation,some problems such as frequent pressure shocks at the time of commutation are found.Then,in order to improve the operation state of the system,the influence of the parameters of accumulator on the pressure shock in the excitation device system is analyzed,which can provide a theoretical basis for the selection of accumulator.The mathematic model of accumulator and pipeline at its interface is established,and the related parameters are studied and analyzed by means of simulation and test verification.The results show that the length and diameter of the pipeline at the accumulator interface hardly affect the response rate of the system,shortening the length and increasing the diameter of the pipeline can reduce the pressure impact;the volume of the accumulator has no obvious effect on the pressure impact of the system,but reducing the volume can help to improve the response rate of the system;the peak value of the pressure impact of the accumulator is greatly affected by the pre-inflated pressure of theaccumulator.The inflatable pressure should be set to 0.8-0.9 times the working pressure of the system,which can reduce the pressure impact of the system and make the response of the system more rapid and stable.Next,the pipeline layout of all kinds of hybrid energy-feeding suspension is analyzed,and a reasonable and easy-to-implement prototype is selected.According to the composition and structure of the half bridge energy-feedback shock absorber,the working principle of the hydraulic system is introduced in detail.By sorting out and analyzing the pressure drop formulas of the components in the pipeline system,the mathematical models of the compression and recovery stroke damping force of the energy-feedback shock absorber are derived.By using AMESim simulation software,the parameters of the main components of the energy recovery shock absorber are set.It is found that the simulation model can reasonably reflect the working state of the hybrid energy-feedback shock absorber.Through theoretical calculation,the energy recovery efficiency of the energy-feedback suspension is estimated.The simulation model verifies the reasonableness of choosing the half-bridge hybrid energy-feedback suspension as the research object.Finally,the prototype of hybrid energy-feedback shock absorber is built with reference to the simulation model.The validation test of the damp force of the prototype is carried out to verify the rationality of the half-bridge hybrid energy-feedback suspension scheme and the accuracy of the simulation model.By analyzing the measured data,the problem of excessive damp force of theprototype is found.Based on the analysis of the mathematical model of the damp force of the energy-feedback suspension,the simulation software is used to simulate the parameters.Based on the analysis,a series of effective methods to reduce the damping force are proposed.