Research On The Duty Vehicle Powertrain Mounting System Structure Optimization

In recent years,the international market has developed a new layout of the four-point assembly powertrain suspension system in the rear end of the gearbox.Based on the requirements of vehicle ride comfort,performance and component reliability,an application study on this type of commercial vehicle power assembly suspension system was conducted by a commercial vehicle manufacturer,in conjunction with the powertrain suppliers.In combination with the major decorate form of domestic suspension,as well as the development process of a commercial vehicle suspension system,this paper analyses the application on this new type of suspension system in the domestic market for the layout,structure features and performance of vibration isolation.At the same time,this paper tries to perfect and explore a systematic application method of suspension system.Such researches are necessary for the development of domestic commercial vehicle suspension system,and it is also expected to provide some valuable references for the study of the domestic commercial vehicle suspension system.This paper adopts typical and mature vibration isolation research and dynamic modeling method.In this paper,the excitation mechanism and frequency of the engine are analyzed,and the modal indexes of the suspension system are formulated.The multi-body dynamics model of 6 degrees of freedom is established.Decoupling analysis and index formulation are conducted by means of energy decoupling method.By means of ADAMS simulation analysis and other software,the modal decoupling ratio of the suspension system is calculated.Finally,the performance of the suspension system before and after optimization is evaluated and compared,and the design potential failure risk identification of the suspension system and its related parts is carried out in combination with the demand of vehicle application.The results of performance calculation and risk identification show that the vibration isolation performance of the suspension system can also meet the design requirements.However,the whole performance is better for the optimization one,which has higher reliability and can effectively guarantee the reliability of the vehicle related spare parts.This indicates that the optimized suspension system is more suitable for the vehicle performance requirements.The reasonable modes and vibration decoupling effect can be obtained for the optimized suspension system,through the proper adjustment of the suspension position and stiffness.but it is required to pay more attention to the reliability of engine.