Multi-objective Topology Optimization Design On SUV Frame

As the advanced report and hotpot in structural optimize field, multi-objective topology under multiple loading conditions is the emphases and difficulty in this field. In this paper, basing on the off-road vehicle’s frame, the importance of light weighting vehicle structure is highlighted, the history of the development of topology optimization is recalled, and the design idea of using multiple-objective topology optimization to analyze and optimize the frame is put forward.Then, the theory of topology optimization is introduced. A multi-objective topology optimization for the frame is conducted with the minimum compliance as objective and the volume and frequency as constraints, based on SIMP interpolation scheme and weighted compromise programming approach. And through the standardization of methods for different target function is defined to eliminate the order of magnitude difference, using the optimality criteria method to update the design variable calculation, obtained the topology optimization results which is similar to the X-shaped frame.Based on the standards of bending stiffness, the solid structural frame is transformed into hollow structural frame. The stress results of the frame were calculated based on finite element analysis. From the results the conclusion can be made that the material are not made the best use of. And the optimal thicknesses of vertical and horizontal beams can be obtained by size optimization. By the simulation analysis on the new frame, the static and dynamic parameters of the new frame are obtained and compared with original design. The calculation results show that the performance parameters of the optimized frame are improved to varying degrees, such as the mass reducing by12.8%, bending stiffness increasing by71.9%, torsion stiffness increasing44.1%. At the same time, the modes of the frame have been conformed to the request.