Vibration Reduction Performance Analysis And Optimization Design Of Engine Mount System Based On ADAMS

Engines is caused by the vibration influence the vehicle ride comfort, along with the increasing progress of auto technology, vehicle harshness (NVH) performance pay close attention to by the people. The size of the powertrain mount system for vibration isolation ability will directly affect the performance of harshness (NVH) of vehicles. Therefore, the design can effectively reduce and isolation of powertrain vibration to the frame relay, has good vibration isolation ability of powertrain mount system, is a key process to improve the performance of harshness (NVH) of vehicles.This article is based on group take on a certain type of engine mounting system in the design of the shock absorber as the background, in view of the design of the shock absorber damping performance analysis and optimization. Selected on the basis of consulting a large number of related literature, three metal rubber damper layout of powertrain mount system as the research object, combined with suspension system modeling technology, energy decoupling theory, metal, rubber shock absorber and optimization design of the simulation and experiment, has practical application value.First, the vibration characteristics of engine and vibration isolation mechanism of the powertrain mount system are studied, expounds the function of suspension system, summarizes the general suspension system design method, analyzed the12cylinder engine vibration force and vibration frequency. Secondly, on the basis of known basic parameters of powertrain, based on the multi-body system dynamics software ADAMS, six degrees of freedom model of powertrain mount system is established, the dynamic response simulation is carried out on the suspension system, namely the suspension system for frequency domain analysis, corresponding get six order modal frequencies and the main formation corresponding decoupling rate; Time domain response of suspension system analysis and calculation in idle speed, medium speed and high speed under the condition of dynamic reaction force and the center of mass acceleration response characteristics. Then, according to ADAMS, optimization theory, the suspension of decoupling rate of optimization, anisotropy on three metal rubber damper stiffness value as optimization variables, to mount the inherent frequency range and motion space limitation as constraint conditions, system decoupling rate as objective function, a multiple objective function optimization is realized by regulating suspension stiffness. Finally, the bench test of the suspension system, obtained under the optimized powertrain response characteristics of the suspension system under various conditions, and analyzes the main composition of exciting force of the engine under various conditions, the optimized model meet the design requirements is verified.Research shows that the natural frequencies of the powertrain within the scope of the constraints, the decoupling rate increase, dynamic reaction force amplitude reduced in idle speed, medium speed and high speed, has reached the design target, improved the harshness (NVH) characteristics of the vehicle.