Design And Analysis Of The Structure Of A Double-wishbone Type Suspension Of UTV Vehicle

The UTV vehicle, a type of all-terrain vehicle, plays a very important role in manyareas such as agriculture, forestry, animal husbandry, petroleum, electric power, mining,military, Firefighting for its strong climbing ability and the ability to adapt to all kindsof terrain. However, along with the strong ability, the requirement of the suspension ofthe UTV vehicle is very high. This paper takes the double-wishbone independentsuspension of some UTV vehicle as object to evaluate the performance of thesuspension through analyzing the structural rigidity, the kinematics, the structuralstrength and other parameters of the suspension. The main contents and conclusions ofthis paper are:Firstly, the value of the original stiffness of the suspension arm is computed byforce analysis and applying static loads and the boundary conditions on the model. Thena multi-body kinematics model and an elastic kinematic model of the suspension (loadexcluded) are created to mutually verify their accuracy through their comparison aboutthe suspension kinematic parameters in the main wheel run-out simulation theory.Secondly, for comprehensive study of the suspension under external loads, themodel of the whole vehicle containing suspension is established to analyze thetransience of the resonance kinematic parameters and the structural strength of thesuspension in fully loaded condition. The models under the20%and the50%overloaded conditions separately are also simulated and analyzed and their calculatedresults are evaluated in terms of the design requirements and the strength criteria.Finally, the stiffness of the suspension are optimized and improved with regard tothe existing questions in the transient analysis of the suspension kinematics andstructural strength. The following are the optimization results: an increase of10.8%,23.5%and23.7%separately of the mass, the bending stiffness and the torsional rigidityof the upper-arm suspension; the arm stress safety factor after optimization increasesfrom1.436to1.716in the fully loaded condition with an increase of19.5%; thefluctuation of the suspension kinematics variable, especially in the transient impactcondition, reduces as a result of the increase of the suspension stiffness. Therelationship between the suspension kinematics, structural strength and stiffness, load ofthe suspension are concluded by comparing the suspension kinematics and the stressbefore and after the structural optimization in the above conditions: the greater the load; the larger of the fluctuation of the suspension kinematic parameters and the structuralstress; the structural stress and the fluctuations suspension kinematics reduces with theincrease of the stiffness under the same load condition. But this improvement has itslimit. When the suspension stiffness increases to a certain extent, the improvement is nolonger obvious.In this paper, the design and analysis of the UTV vehicle suspension containsvarious performance parameters of the suspension and its influence factors that makethe paper have some engineering significance in structural design, analysis andoptimization of UTV vehicle suspension.