The Dynamic Analysis Of Vehicle Suspension And Study On The Detection Method Of Its Performance

Suspension system is an important part of vehicle, which technical condition directlyaffects the comfort, safety, operation stability of the vehicle. This paper studies thedynamic characteristics of vehicle suspension system and suspension system performancetest method, puts forward suspension system performance evaluation parameters,establishes suspension system performance testing system, and builds a suspension systemperformance testing platform.This paper simplifies the vehicle vibration model: from the car with seven degrees offreedom vehicle model to four degrees of freedom model, then establishes for asingle-wheel of1/4vehicle with two degree of freedom vibration model by using Newtonmethod and Lagrange method; analyzes the vibration model of dual quality1/4car of theresonance of the dynamic characteristics, calculates the body inherent circular frequencyand natural wheel inherent circular frequency; which puts forward the suspension systemparameters: the relative dynamic load of vehicle wheel, the vehicle body acceleration andsuspension dynamic deflection relative to the amplitude frequency characteristics of roadexcitation speed. The paper creates and verifies the road roughness in MATLAB softwarewith the two principle of the harmonic superposition and filters white noise method, andanalyzes vibration response of the McPherson suspension system in the SIMULINKenvironment to verify the damping effect and the analysis results of resonance dynamiccharacteristic of suspension system, then with MATLAB GUI as the developmentplatform to create the performance testing system for suspension system. Based on theMcPherson suspension spatial structure as well as its physical and mathematical models,the paper builds a suspension system performance testing platform, then test and analysisof data. In a conclusion: the car relative dynamic load amplitude frequency characteristiccurve and theoretical waveform is consistent, frequency and maximum amplitude of carbody acceleration FFT/FT spectrum is natural with theoretical value.