Performance Analysis And Optimization Of Air Suspension Guiding Mechansim

Virtual simulation,performance analysis and optimization are used for the air suspension guiding mechanism of advanced air suspension passenger car.It is analyzed that the air suspension guiding mechanism has an effect on handling stability and ride comfort.In addition,the air suspension guiding mechanism is optimized based on front wheel alignment parameters and mechanical strength of guiding mechanism.3D model of front and rear air spring suspension are established in Pro/E.Based on the theory of multi-body system dynamics,multi-body system dynamics models of front and rear suspensions model are built in ADAMS.Furthermore,the full vehicle model including engine,steering system,front and rear tire and so on are built based on the front and rear suspension.The test and simulation about the passenger car are achieved.The results tally with each in contrast test with simulation.Thus,it can be gained that not only the simulation model is correct but also the model of front and rear suspension is accurate.Furthermore,the installation location of front and rear air suspension guide mechanism is analyzed(Design of Experiments).Besides,linear, quadric and cubic regression model are build.It shows that result of cubic regression model is best according to comparing with two other results.The effect on objects can be obtained according to result of cubic regression model mentioned above.Finally,a kind of optimized design scheme is obtained.Finally,a parameterized 3D model for an air suspension guiding mechanism is built in Pro/E.The finite element model,which is synchronized with Pro/E based on the two-way parametric transmission tool built in ANSYS Workbench,is established.The optimization model of the propelling rod assembly,in which the critical geometries of assembly are taken as design variables and the maximum stress of certain critical parts of the assembly of the total mass are taken as objective functions,is developed for the purpose of decreasing the maximum stress and the total mass.The effect of design variables on the stress of each part is analyzed.A feasible optimization scheme is obtained,based on the sensitivity and design space analysis of the optimization objectives.The strength performance is improved significantly while the total mass is reduced.The optimization results show that the proposed method is easy to implement and able to obtain optimal design.