The Research And Optimization Of Heavy-duty Tractor’s Frame

The frame is the main bearing member of automobile, its function is to bear the various loads from inside and outside, to connect the major assembly and all kinds of vehicle equipment, structure mainly depends on the automobile layout requirements. Thoroughly understanding the load bearing characteristic of frames is the base of improving and optimizing the structural design, and also the key to guarantee the vehicle performance.This thesis chose the frame of SX4257NT324heavy-duty tractor as the research object, the3D geometry model of this frame was constructed by the software of Pro/E; Based on the analysis of the structural characteristic of the frame, the finite element model of the frame was established by the software of HyperMesh; According to the load bearing characteristics and running conditions of heavy-duty tractors, the static stress distribution of this frame in fully loaded bend condition and torsion condition was analyzed, and through modal analysis, its frequency and vibration mode of first ten modes were also found.Based on the analysis above, the structural optimization of the frame is discussed in this thesis, and the finite element analysis of the optimized scheme has been done, by comparison to the dynamic performance of original structure, the feasibility of structural optimization was confirmed.Via the analysis of frame dynamic performance, the structural optimized design, and the application in engineering project, it’s proved that using finite element method, not only makes design and analysis of frames more accurate and feasible, but also shortens the period and reduces the cost, the foreground of its application would be extensive.