Optimal Design Of Semi-active Hydraulic Mount For Improving Ride Comfort Of Light Trucks

With the development of Chinese logistics and economy,light trucks have been widely used in logistics transportation and other fields.Therefore,the research on the NVH performance of light trucks,especially the research on its engine suspension,is quite important.At present,there are few researches on the vibration isolation performance and riding comfort of light truck engine mounts in China,and traditional rubber mounts are mostly used on light trucks.In view of the poor vibration isolation performance of a light truck,the research object of this paper is the light truck.This paper carries out the decoupling calculation of light truck powertrain,light truck vibration isolation test,light truck vehicle model establishment and simulation,the research on multi-objective optimization of assembly suspension,light truck ride comfort analysis,and semi-active hydraulic mount simulation and design.This paper has played a guiding role in the research on light truck vibration isolation performance and ride comfort.Through experiments on the initial powertrain of the light truck,the initial powertrain decoupling and vibration isolation effect are tested and analyzed,and the suspension stiffness is roughly optimized based on the modal frequency and decoupling rate.At the same time,on the basis of the six-degree-of-freedom model of the powertrain,the body,unsprung mass,seat,and human body models are added to establish the fifteen-degree-of-freedom model of the vehicle,and the reliability of the vehicle model is verified according to the test results.After verifying the reliability of the model,the front suspensions are replaced with the semi-active hydraulic suspensions,and the Isight and Matlab software are used for co-simulation,while the modal frequency,decoupling situation and vibration isolation effect are optimized as the optimization goals,and the suspension are the objective.This paper optimizes the design and match the stiffness and angle parameters of the semi-active hydraulic mount.After optimization,the vibration isolation performance has been improved by 5 dB or more,and the suspension acceleration has been reduced by nearly 45%.Finally,according to the optimized semi-active hydraulic mounting stiffness and other parameters,a semi-active hydraulic mounting model is built on the AMESim platform.The static stiffness,installation space and internal structural parameters of the semi-active hydraulic mount are designed.And the electronic control strategy of the semi-active hydraulic mount is determined by using the random road Simulink model and the vehicle model,which balances the suspension deformation and ride comfort.And under idling and driving conditions,the ride comfort before and after optimization is calculated and analyzed,and it is concluded that the optimized suspension system greatly improves the ride comfort under idling conditions,but in driving conditions,the optimized engine mount has less impact on riding comfort.