Characteristic Simulation Optimization And Displacement Control Design Of A Car Powertrain Mounting Systrm

With the continous improvement of automotive technology and people’s livingstandards, the role of car in people’s production and life has become increasinglyprominent.Car ride comfort as a key performance indicator is paid close attention bymore and more consumers. The key to improve the car’s ride comfort is to improve theNVH performance of vehicles. The ability of isolation and displacement restriction ofautomotive powertrain mounting system for the NVH performance of the car has animportant impact.In this paper, takes a domestic car of powertrain mounting system as the object ofstudy, on the basis of relevant theory of mounting components and design of mountingsystem, the simulation of the relevant parameters of the Inertia channel-decoupling dischydraulic mount impact on its dynamic characteristics is done by theMATLAB/Simulink software, the results show the influence law of the relevantparameters of the hydraulic mount impact on its dynamic stiffness and lag angle.Fuether the simulation and analysis of the inherent characteristics and dynamiccharacteristics under three typical conditions of powertrain mounting system is done bythe MATLAB software. The simulation and anslysis show the problems after thecharacteristic analysis of powertrain mounting system and the necessity of optimization.In view of the problems of mounting system after characteristic simulation andanslysis, takes six modal decoupling rate and dynamic reaction force amplititude as thegoal, takes the mounting static stiffness as design variable, with the consideration of theuncertainty of mounting static stiffness and a vatiety of constrains, based on6Sigmarobust multi objective method, the mounting system is optimized by the ASGA-Ⅱalgorithm, the decoupling rate of the system is greatly improved, the frequencydistribution is more reasonable, dynamic reaction force magnitude is smaller, theisolation rate is greatly improved. And the optimiazation program and deterministicoptimization program are compared illustrates the adavantages of previous optimizationprogram on the robustness of results. With further reference to the specifications of General Motors Corporation GMW14116, both robust and optimized solution is appliedto the displacement control design by the Matlab/Simulink software, the centroiddisplacement of powertrain and three directions displacement of each mount areobtained, the limit requirements are meeted.It has an important significance for improving vechicle NVH performance andreasonably be designed to match the car through simulation optimization anddisplacement control design of powertrain mounting system.