A Special Vehicle Cabin Structure, Finite Element Analysis And Optimization

This thesis focuses on the research of the working cabin of one special vehicle. Based on diversified working conditions, the whole cabin is modeled by finite element; meanwhile, in order to verify the feasibility of the design, the static analysis, modal analysis, as well as transient response analysis of the model is carried out with FEA method. Then, topology optimization of the overhead equipment, one of the crucial parts of the cabin, is performed to reduce weight. The main contents are as follows:1. Based on the real model and working status of the cabin, the three-dimensional solid model has been logically simplified with HyperMesh, including chassis framework, overhead equipment bracket, upright column, cabin composite board and maintenance rig, etc. Then the complex structure is modeled by finite element.2. Utilizing the finite element model above, the static strength and rigidity of the cabin are analyzed separately in six different sub cases by the software MSC.Nastran, and stress and displacement parameters of the key part are obtained, which are valuable to the design. Moreover, considering the result obtained, some useful suggestions are proposed.3. Chassis framework and overhead equipment bracket are modified. Natural frequency and vibrancy are gained by mode analyzed of the structural, which are chiefly concerned by engineers. Besides, transient response analysis of the model is implemented, and the conclusions demonstrate that the rigidity of the partial structure is weak. After improving the structural and calculating the model again, the result proofs the practicability of the design.4. According to the result obtained above, overhead equipment bracket are modeled third times. Topology optimization of the overhead equipment is analyzed in order to lighten the weight. Comparing with its mechanical properties fore and after optimization, the conclusion indicates that topology optimization can provide precious design considerations in lighting weight of mechanical structural.The conclusions in this paper can provide a significant contribution to design, improve the performance and extend the service life of cabin.