Optimization Analysis Of Control Arms And Frame Of UTV Vehicle

UTV vehicle (one type of all-terrain vehicle) has a strong climbing ability and theability to adapt to a variety of terrain. It can freely drive in complex terrain. It is anall-powerful tool. it has wide market and the development of this vehicle has greateconomic value. In the development process, the development of control arms andframe is very important. Because their structure is related to power，fuel economy,steering stability and tire wear. Therefore, research control arms and frame structurerationality is very meaningful. In this paper, control arms and frame are the researchobjects and topology optimization analysis is for their structure, the main conclusionsand content:Firstly, the finite element model of UTV is established. By simulating the dynamicmotion of UTV on the road, front alignment parameters are calculated. The resultsindicate that Kingpin caster angle and Kingpin inclination angle is reasonable, but thenegative camber angle and Toe-in of Front Wheel angle is too large. The reason is thelack of arm stiffness.Secondly, the optimizaiton space is established and boundary condition is imposed.The optimization analysis is made after setting up constraint and objective functions.Adopting topology optimization to improve arm stiffness. After two optimizations,wefind the best material distribution and new arm structure is designed. The mass of thenew structure increases1.4kg. The natural frequency and bending stiffness hasimproved obviously. Calculating the changes of front alignment parameters again. Theresult indicates that camber angle and Toe-in of Front Wheel angle has improved,andthey are within a reasonable range.Thirdly, modal analysis, strength analysis, dynamic analysis and fatigue analysisare made about frame. The result indicates the natural frequency of frame meet therequirement，but slightly lower.And the stiffness of frame is low; the strength of somepositions of frame is low, so that the fatigue failure may occurs here. Aiming at theseproblems, topology optimization is used for frame. According to the optimization result,the new frame structure is designed. The mass of the new frame reduces50kg. Then theabove analysis is used for the new frame, the result indicates natural frequency andstiffness has improved obviously. And fatigue failure occurs infrequently.The article about topology optimization of control arms and frame on the development of control arms and frame structure has a certain reference value. At thistime, the lightweight research of control arms and frame is significant.