| With the development of the road transport industry in China,the market demand for semi-trailer is increasing.In order to ensure the integrity of the goods in transit,the requirements for the safety and ride of the semi-trailer are gradually improved.The traditional leaf spring semitrailer has not been able to meet the demand.Based on this problem,a hydro-pneumatic suspension applied to semi-trailer was introduced in this paper.The dynamic model of the two chamber and hydro-pneumatic unite spring was established,and the ride comfort of the hydro-pneumatic suspension semi-trailer under pulse input and random input was analyzed.Based on the working principle and structure of the two chamber and hydro-pneumatic unite spring,dynamic model were derived.The model of two chamber and hydro-pneumatic unite spring was built in AMESim,and the accuracy of AMESim model was verified by comparing simulation results with experiments.The influence of key structural parameters on nonlinear damping and nonlinear stiffness was analyzed.The two mass vibration model of hydro-pneumatic suspension and leaf spring was established.By comparing the acceleration RMS value of the sprung mass,suspension dynamic displacement and the dynamic load of tyres,the effectiveness of the suspension scheme was verified.The coupled hydro-pneumatic suspension model of the high pressure cavity through the accumulator and the independent model were established.The simulation results were compared,and the function of the high pressure cavity through the accumulator was analyzed.The multi body dynamic model of the tractor-trailer was established in ADAMS.With reference to GBT4970-2009,under the pulse input,maximum value of the absolute value of the vertical acceleration of the cargoes was analyzed under the prescribed speed.Under the stochastic road input,RMS value of the vertical acceleration of the cargoes,and the dynamic travel of the suspension and the dynamic load of the tyres were analyzed under the usual vehicle speed.The ride of the semi-trailer with hydro-pneumatic suspension was evaluated. |
PDF Full Text Request