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目的:从公差仿真结果中获得依据,以此优化公差值及公差方案,并通过灵敏度分析来验证单个参数的改变对所得仿真结果的影响。创新点:1.根据公差技术,对凸包采取基于方差的全局敏感度分析;2.提出估计单个零件公差对装配间隙影响的方法。方法:1.采用特征要素公差带凸包表示方法(图1);2.进行基于方差的全局敏感度分析(图2);3.通过灵敏度分析算法分析相对间隙和公差值的关系(图3、4和5);4.以销孔装配为例,验证该方法的可行性(图7、8和9)。结论:1.销孔连接的实验证明了基于凸包技术的全局敏感度分析的必要性;2.基于凸包的灵敏度分析方法可用于分析单个零件公差对装配间隙的影响。
OBJECTIVE: To obtain the basis from the tolerance simulation results, so as to optimize the tolerance value and tolerance solution, and to verify the effect of single parameter change on the simulation results through the sensitivity analysis. Innovative points: 1. According to tolerance technology, convex hull to take a global variance-based sensitivity analysis; 2. Proposed to estimate the impact of individual parts tolerance assembly clearance. Methods: 1. Using convex hull representation of feature tolerances (Figure 1); 2. Performing a global variance-based sensitivity analysis (Figure 2); 3. Analyzing the relationship between relative clearance and tolerance values using a sensitivity analysis algorithm (Figure 3, 4, and 5); 4. Verify the feasibility of this method using pin-hole assembly as an example (Figures 7, 8 and 9). Conclusions: 1. The experiment of pin hole connection proves the necessity of global sensitivity analysis based on convex hull technology. 2. The convex hull based sensitivity analysis method can be used to analyze the influence of single part tolerance on assembly gap.