特征几何变动, 自由度(DOFs), 公差综合, 建模与仿真, 装配功能要求

Aimed at the AFR specified in the stage of design, a mathematic model that can be used to tolerance synthesis simulation in CAT was established based on the geometric features' variations of DOF. Two steps were involved in the course of tolerance synthesis modeling: the relationships among each feature's DOFs with AFRs were explicitly formulated with homogeneous matrix transforms and the synthesis equations were obtained with the matrix inversion technique. An engineering example, gear pump, was introduced to test the proposed method. The synthesis equations between the backlash spacing and the corresponding features' DOFs were obtained, and the distribution of each feature's DOFs was calculated by the method of Monte Carlo. The results show the validity and practicability of the method proposed.