Analysis Of Bus Body Vibration Characteristics Caused By Engine Idle Excitation

A reasonable bus body vibration characteristics can not only improve the NVHperformance, but also raise the product quality, shape the brand image, as well as reducethe traffic noise pollution. Utilizing domestically manufactured passenger bus as object,based on integration of powertrain and the vehicle body, Multi-body dynamics, finiteelement method, dynamic sensitivity analysis and structure optimization werecomprehensively used to study dynamic simulation on vehicle body vibration that causedby engine idle excitation.A12-DOF Multi-dynamics model and a finite element model for thebody-in-white(BIW) were established. In order to solve dynamic responses on featurepoints of BIW quantitatively, dynamics simulation and finite element simulation werelinked through the dynamic loads, which were generated by engine idle excitation onpowertrain mounting system. This vibration simulation method was utilized in structureoptimization to solve the problem of VIP seat vibration anomalies on idling condition.Under the guidance of the dynamic sensitivity analysis, riding comfort was greatlyenhanced the carframe-gestellboden structure through partial adjustment and sizeoptimization with the approximate model technology and genetic algorithm.The comparison between results of simulation and test shows that this method canbe closed to actual conditions authentically. This simulation method can reduce the datatransmission error and improve the solution accuracy of the dynamic responses with thewhole process in the Hyperworks Desktop. It is not only applied into dynamic optimaldesign to effectively improve the riding comfort, but also used on solving the problem ofvehicle body vibration under the driving condition.