The Influence Of McPherson Suspension Structure On Its Dynamic Performance And Experimental Research

Dynamic characteristics of macpherson suspension as well as the effects onautomobile ride comfort with the system structure parameters and installation layout hasa close relationship. At present the institute to establish dynamic model of comfortabilityonly considers the changes spring shock absorber damping and stiffness, But ignoredunder the stiffness damping parameters selected according to different structure layoutwill produce a great impact on the overall stiffness and damping of suspension to altersuspension performance and vehicle ride comfort, nor for the selected structureparameters and installation layout for Mechanical analysis and verification. So toconsider the problems and solutions, This article selects the most commonly usedmacpherson suspension system as the research object, On the basis of the test platform tomain research shock absorber Angle, suspension installation leverage ratio and tirepressure on the performance and influence comfortability of macpherson suspension.Paper based on the theory of vehicle dynamics, establish a macpherson suspensionstatic model and dynamic model. Through the static structure model under roadexcitation displacement effect on the suspension structure, get the point of view ofsuspension parameters, such as displacement change with the road excitation curve.According to Newton’s second degree of freedom vibration equation and combined withvirtual displacement method and equivalent law to establish a dynamic model. Bychoosing suspension leverage ratio, shock absorber installation Angle and tire pressureon the car had a greater influence on the overall stiffness and damping parameters foranalysis and research of the automotive ride comfort. At the same time combined withactual situation to design and build "a quarter car macpherson suspension test-bed basedon LMS", Through the test-bed for the corresponding experimental research andtheoretical results of static and dynamic model analysis contrast test and verify. Based onMatlab/Simulink developed in suspension under different structural parameters andinstallation layout for vehicle ride comfort and the influence of suspension dynamicsimulation system.Through the theoretical analysis of simulation results compared with the results ofverification show that suspension installation leverage ratio on auto system as a wholestiffness, damping and the influence of the vertical acceleration is the largest, In thepremise of body structure, should as far as possible away from the center of suspension,namely install greater leverage ratio; Shock absorber Angle biggest influence on side force of the damping rod, should try to reduce the shock absorber Angle to meet the ridecomfort and suspension structure security; As carrying capacity and comfort of tirepressure is a contradiction, should be on the premise of meet the bearing capacity tominimize tire pressure in order to improve the comfort. Also verified the established testbench and simulation system’s reliability, right for future suspension dynamics and thefurther study of comfortability and structure optimization to provide new methods andvaluable reference.