Analysis For Vibration Performance Of Passenger Car And Research On Rubber Bushing Modeling Theory

In the process of designing new vehicle product, accurate simulation models arecreated by engineers to predict vehicle dynamics performance and to make correspondingoptimal scheme, which can be essential for company to deal with the increasingly fiercemarket competition. The vehicle vibration comfort is one of the key concernsperformances and research on it has important application value.Taking a object of high-end business coach,the thesis discusses vehicle comfortanalysis methods and improvement process, as well as precision bushings model theoryfor dynamic simulation.The main content of the article include the following:Firstly, splitting into subsystems to improve the modeling and validation efficiency,full vehicle dynamic simulation model is established, which includes front suspensionsystem, rear suspension system and shaft vibration analysis model. Combined withanalysis results of subsystem and automotive design theory, frequency planning table isdeveloped, providing the basic principle for design layout.Secondly, subjective trial and objective vibration test are carried out to determine fullvehicle vibration levels and inadequate design.With "Source-Channel-acceptor" analysismethod, transfer path analysis is developed to enhance vehicle vibration comfort under theconstrain of frequency planning table.Finally, study on rubber bushing modeling theory is made on the base of latexmaterial properties and classic bushing dynamics model.The correction Bouc-Wen modelis obtained after local sensitivity analysis and parameter identification through geneticalgorithms.Then its application value and superiority are verified comparing withKelvin-Voigt model during front suspension system simulation.