Optimal Design And Dynamic Analysis On The Front And The Rear Frame Of XG958Wheel Loader

The loader is a machine to use the broader construction machinery, widely used inconstruction, mining, utilities, bridges, railways, highways, ports and national defenseprojects. The loaders frame can be divided into integral and articulated. The integralframe is a rigid overall, general by steel plate welded together. The articulated frame iscomposed mainly of the front frame, rear frame, and the sub-frame. The front frame andrear frame hinge by the upper and lower hinge pin, and can be relatively rotated in thehorizontal plane. Frame support most of the weight of the entire loader, but also towithstand the forces and moments of the various components of the system fromassignments and walk process, so the frame must have sufficient strength. Strengthanalysis of the frame is a very important aspect of the loader design and developmentprocess. When loaders operating or driving on a bumpy field and road, the frame is alsosubject to severe impact loading, therefore, the loader frame structure requires a kineticstudy.In this paper, firstly, three-dimensional solid mode of the XG958wheel loaderframel is established in proe by factory, and imported it into the finite element analysissoftware ANSYS to create a finite element model. In a typical operating conditions, thewhole force analysis of the finite element model is done by ANSYS to get the stressdistribution of loader front and rear frame.According to the characteristics of the stress distribution, equal strengthoptimization of the frame is done using the stress constraints weight-guided criterionmethod, so that determine the boundary conditions and performance constraints, selecte20plate thickness of the structure as a design variable, determine the total weight of thefront and rear frame as the objective function, and give the optimization results. Theoptimized frame for the finite element analysis is also done in a typical operatingconditions. In addition, this paper makes dynamic modal analysis of optimized front and rearframe, and gets frame’s natural frequency, mode peculiarity and Stiffness of the front andrear frame. The weak stiffness of frame structure is appropriate improved to make itsstiffness improved. Finally, improved front and rear frame excitation frequency isverified.This paper makes structure analysis and modal analysis of XG958wheel loaderfront and rear frame, and achieves ideal optimization results. Not only ensure themaximum stress of the structure to meet the220Mpa stress constraints, but the weight ofthe frame structure from the original structure of2471kg down to2439kg, reduce weight32kg. Besides, by modal analysis, to ensure the frame has sufficient rigidity and avoidframe resonance occurs in the work.