基于修正矩阵的刚柔混合模型公差分析方法

A Unified Tolerance Analysis Method Based on Modified Matrix for Rigid-Compliant Hybrid Model

为了在设计阶段进行公差分析、结构优化,文中讨论了刚柔混合模型的装配偏差,提出了一种基于修正矩阵的公差分析方法。将刚柔混合模型的理想位姿、公差域表示为矩阵形式,借助齐次变换进行公差累积。使用有限元模拟装配变形,将仿真结果表示为修正矩阵,对原有的偏差累积路径进行修正,从而实现了对刚柔混合模型关键尺寸的精确预测,为设计优化奠定了基础。以汽车车灯装配为例,验证了该方法的可行性。

For tolerance analysis and structure optimization in the design stage, this paper discusses assembly variation for rigid-compliant hybrid model. A unified tolerance analysis method based on modified matrix is proposed. Information of position, orientation of parts and tolerance zone are expressed in the form of ma- trix. The key product characteristic （KPC） is represented with the help of homogeneous transformation. The assembly deformation is simulated through finite element analysis （FEA） and the simulation result is used to modify the original variation buildup. The accurate prediction of the key product characteristic of rigid-com- pliant hybrid model is achieved, which lays the foundation for design optimization. A case study employing this methodology is presented and demonstrated by 3DCS software.