Research On Relationship Of The Range Of Damping Body’s Parameters To The Rigid Body Vibration Suppression Of Powertrain Mounting System

At present, engine towards the direction of high power, engine become a majorsource of noise and vibration inside the vehicle. People increasingly high demand forride comfort, and how to isolate vibration of powertrain to the car has become animportant part of car design. Powertrain mounting system with he role of support, limitthe displacement and isolate the vibration of powertrain, rigid vibration of powertraincan be effectively inhibited with suitable parameters of mount. From the point of viewof isolation,the stiffness of mount should be low enough; to limit the displacement ofpowertrain,the stiffness of mount is the higher the better.On the basis of domestic and international-related information and documentation, adynamic model of powertrain mounting system is established and dynamic equations ofthe system is deduced. With an example of a domestic car, a simulation model is buildt,analyzed the original mounting system binding experiments and pointed out itsshortcomings. By orthogonal experiment method, analysed the relationships betweenthe parameters of mount and vibration isolation performance.Considered energydecoupling and vibration transmissibility, combined with the results of the sensitivityanalysis, optimized the original mounting system with stiffness as design variable, andanalyze the results. Designed nonlinear stiffness curve based on mounting system afteroptimization, to inhibit excessive vibration of powertrain in some special conditions.