Study For The Independent Suspension System Of An Off-road Vehicle Based On ADAMS

People pay more and more attention on the ride comfort of the off-road vehicles as they care about the ride comfort of cars. The suspension system which transfers all kinds of forces and torques from tires to vehicle body is the most important and direct factor that influents the vehicle s ride comfort. The suspension system research includes two areas. One is called suspension system dynamics and the other is called suspension system kinematics and compliance.The area of suspension system dynamics researchs the force characteristics of spring elements and damping components for improving ride comfort. This paper is specially to study the dynamics characteristics of an off-road vehicle independent suspension system and some special conditions simulations including including driving the vehicle through vertical step, pothole and grade.This paper is based on multi-body dynamic theory software ADAMS/CAR and uses this software to build a rigid whole multi-body model which includes front and rear double wishbone independent suspension systems,parallel link steering,antilroll bar,seat system,body, four-wheel drive powertrain and UA tires. Considering the front and rear double wishbones low arms and the antiroll bar as flexible parts and using the ANSYS software flexing them,then transforms the flexible parts into ADAMS and bulid a rigid- flexible whole multi-body model.This paper introduces the people s reactions to vibration and evaluation method of ride comfort. This paper uses the ADAMS/CAR s road profile generation tool which is based on sayers mathematical model to generate the road profiles,does ride comfort simulations for the rigid whole multi-body model and the rigid- flexible whole multi-body model,calculate results by the MATLAB program which is using for evaluating the ride comfort and compares the two modles s ride comfort lastly.Let the two whole multi-body model experence pulse inputting simulations and compares the two modles s ride comfort again. This paper proves the elastic action of the flexible whole multi-body model's flexible parts s to the ride comfort and the improvement of the modle's precision according to the simulation results.This paper also does some special conditions simulations including including driving the vehicle through vertical step, pothole and grade aiming at off-road vehicle s complex driving conditons.