Optimization And Matching Of Air Mounting For Commercial Vehicle Cab

This paper was proceeded connecting with the item"Integration and Exploitation of Heavy Vehicle"which is a branch of"863"project presided by NVH group . On the basis of researching the configuration of cab mounting and the elastic characteristics of the air spring, cab mounting are matched and optimazed for a certain domestic car.The cab air mounting multi-body dynamics virtual prototype model is created based on the ADAMS platform in this paper. Physical parameters, mechanical parameters is the same as the actual cab data, Geometric parameters in the model is built in Catia.And transfered from UG to ADAMS..In this Environment,the Nonlinear Characteristics of air sprine and damp is simulated by spline.From the simulation and Analysis to the model, Natural vibration frequencies, modal, modal energy distribution, as well as response curve can be learned.We knowed from the simulation results, There is a certain degree of coupling in various bands of modal shape in the Cab. This will lead to cab mounting system resonance frequency band more wider. In the external stimulus, it is more increased in the probability of resonance. In this paper, using the energy method for decoupling cab mounting system optimization. Optimization results of the third-order system that is the main mode pitch, roll and the coupling of vertical direction a certain degree of reduced. The vertical direction which almost completely decoupled. In accordance with ISO2631: 1997E traffic ride on the evaluation approaches, Based on the driver's center of mass-weighted vertical vibration acceleration rms value as an evaluation of the basis for the cab ride. Using DOE method, Choose four factorswhich is cab around Mount stiffness and damping. Polynomial fitting way through nonlinear structure and taking into account the level of interaction, Test selected L₉ ( 3⁴) orthogonal arrangement, effective simplify the testing process. Matlab software is used in the preparation of the driver's center of mass vibration weighted rms value of the acceleration process. ADAMS software will curve to the simulation results in the form of discrete points import and export Matlab software. completed weighted Cab centroid vibration acceleration rms value calculation. Through analysis and comparison identified cab mount parameter optimization results. At the same time in the vehicle load, and no-load speed under different simulation analysis and comparison, overhang evaluation results of the accuracy of parameter optimization.