关键词: 数据管理, 变密度法, 拓扑优化, 形状优化, 尺寸优化, 参数化设计

Abstract: To solve the problem with high safety coefficient and serious waste of materials in traditional design,based on depth study of algorithm for optimum design,the design method of parameterized three-level optimization of mechanical structure was proposed according to the shortcomings of existing optimization method.Through establishing a unified data management mechanism,the optimization design and parameterized design as well as the topological optimization based on variable-density method and element birth and death technology were combined.The maximum static compliance was defined as the objectives,the volume and balance conditions as the constraint and the small density unit as the killed unit to implement the automatic generation of topology optimization model.The birth and death technology of parameterized CAD model was researched based on topology optimization result,and the automatic generation for topology optimization result CAD model was realized by building key points.The optimization method by combining shape optimization with size optimization and parametric design was researched on this basis.The technology of curve fitting based on moving least-squares methods was applied,which could avoid the disadvantages of structure optimization model update manually in the design process.The automobile steering gear bracket was taken as the example to verify the effectiveness of proposed method.

Key words: data management, variable-density method, topological optimization, shape optimization, size optimization, parametric design