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飞机制造中由于工序能力指数和公差等设计变量存在变差,可能导致无法满足飞机装配质量要求以及制造成本波动较大的问题。运用稳健设计方法建立了飞机装配公差的可行稳健性和敏感稳健性两类设计模型。可行稳健设计考虑了公差等设计变量对装配可行性的影响,使其变差不影响装配功能的实现;敏感稳健性设计则考虑了公差等设计变量对制造成本和装配质量的影响,在目标成本较小的前提下使得目标成本和装配质量受设计变量变差的影响最小。提出了针对飞机装配公差可行敏感稳健设计的多目标优化问题的宽容分层序列求解算法。将公差设计中制造成本、装配质量波动、制造成本波动多个设计目标按照重要性依次排序。首先求解成本最小情况下的公差一般优化解,然后在成本最小值的宽容约束下,求得具有装配质量波动最小值的公差,最后在上述两个优化目标的宽容约束下,求得成本波动最小的最优公差。应用实例和分析结果表明了方法的有效性。
Due to the variation of design variables such as process capability index and tolerance in aircraft manufacturing, the quality of aircraft assembly may not be met and the manufacturing cost may fluctuate greatly. The robust design method is used to establish two kinds of design models of feasible robustness and sensitive robustness of aircraft assembly tolerances. The feasible robust design considers the influence of design variables such as tolerance on the feasibility of assembly, so that the variation does not affect the realization of assembly function. Sensitive robust design considers the influence of design variables such as tolerance on the manufacturing cost and assembly quality. When the target cost Smaller premise makes the target cost and assembly quality by the design variables to minimize the impact. A tolerant hierarchical sequence solving algorithm for multi-objective optimization problem that is sensitive and robust to aircraft assembly tolerances is proposed. Tolerance manufacturing cost of design, assembly quality fluctuations, manufacturing cost fluctuations in accordance with the importance of multiple design goals in order. First, the solution of the general solution of the tolerance under the minimum cost is solved, and then the tolerance with the minimum value of the assembly quality fluctuation is obtained under the tolerance of the minimum cost. Finally, under the tolerance of the above two optimization objectives, the minimum cost fluctuation is obtained The optimal tolerance. The application examples and analysis results show the effectiveness of the method.