Numerical Simulation And Analysis On Kinetics For Vehicle Suspension System

Ride comfort is the main purpose of researching Vehicle dynamics.In the process of moving,the vehicle receives an external incentives,which can produce a vibration and impact.vibration of the long time will make the driver and passengers feel uncomf ortable and even lead to physical disease.At the same time,the vibration of high stren gth for the transportation of some fragile items and precision instrument can cause gre at economic loss.In addition,these vibrations will cause parts of vehicle collide with e ach other,produce loss,accelerated aging and thus shorten the life of components,fur ther more,it can affect the reliability of the vehicle structure and driving safety.Theref ore,taking the appropriate control method to reduce these cases,to ensure the safety of the goods,to improve the ride comfort,to prolong the service life of components and to ensure the reliability of structural components,which becomes especially important.Based on the vehicle suspension system as the research object,studying the problem under different degrees of freedom vehicle ride comfort,at the same time,an analysis of the numerical accuracy under different degrees of freedom and the actual degree of coupling.The full text research content is divided into the following:Firstly,research significance and background of this paper is given,analyzed the current for vehicle ride comfort of the current research status at home and abroad,established dynamic physical model research present situation,dynamic mathematical model of numerical research status and the parameter optimization of suspension system research present situation.Vehicle dynamic performance evaluation is related to the three basic movements,i.e.,the longitudinal motion associated with driving and braking;the lateral movement related to guide;the vertical movement associated with suspension and the vibration reduction.In this paper is focused on vertical movement,the basic indicators are riding comfort and driving safety.Wheels and the suspension as an important vibration of car parts can absorb disaffected incentives from the pavement and guarantee a good comfort.Second,the physical mathematical model is set up according to the research purpose,and influence the comfort of road roughness incentive external source,several common pavement input model is given.And combine the driving dynamics of the established physical model,selected the suitable road roughness numerical implementation,and the results are analyzed and compared,found that the road roughness values adopted by the generating method of the numerical results,in line with the national standard “GB/T7031-2005 mechanical vibration of road pavementspectrum measurement data report” in to the extent of road grade requirements.Finally,based on the above given road roughness excitation input,the two degree of freedom model of a quarter car and half car four degrees of freedom model,seven degrees of freedom vehicle model,adopting different precision of the commonly used single footwork and footwork to solve,and the result analysis is presented by not considering the nonlinear factors in physical and mathematical modeling,.Finally,it is concluded that the more footwork can achieve the required accuracy,and the program application more convenient.