Research On Topography Optimization Based On Offset Of Shell Element Reference Surface

Taking the topography optimization technology as the core,the vehicle can be reduced in weight while changing the structure and improving the rigidity and strength of the structure.At present,the topography optimization design with commercial finite element software has been applied in the improved design of automotive thin-walled parts.However,the existing topography optimization algorithms are only aimed at linear analysis and still have many problems.In this paper,three optimization methods are proposed.Based on the shell element theory,based on the shell reference surface offset algorithm,the numerical optimization is coupled with the cellular automata,and the shell reference plane biased hybrid cellular automaton structure optimization system is established.Through the shell renewal and parameter evolution,the best topography optimization structure is obtained.An aluminum alloy structural optimization method suitable for transient impact problems is proposed,which can be used to develop new aluminum alloy car body structural parts,reduce weight while satisfying the security requirements of the design,and improve performance of aluminum alloy structural parts.The coupling method is a combination of numerical optimization and Element Offset algorithm,and the offset distance is controlled by the OFFSET keyword in LS-DYNA.The coupling method of cellular automata and Element Offse algorithm is proposed,which is mainly used for the optimization of topography.This method is based on cellular automata to establish a Element Offset mathematical model,through the preparation of MATLAB program,to achieve the automatic evolution of the structure;Cellular automaton based on the combination of Element Offset and material reduction,while achieving topology optimization and the optimization of the topography shows that the result of the optimization using this method is to achieve lighter weight and enhance the structural rigidity.The comparison between the three methods and the original model shows that the optimization design proposed in this paper can effectively improve the performance of the structure.The three optimization methods are feasible.