基于Pareto最优解的零件制作方向优化研究

摘要

分析了快速成型工艺中零件制作方向对制件表面质量、所需支撑面积和零件制造时间的影响,分别建立了它们的优化数学模型.采用了基于Pareto最优解的多目标优化遗传算法NSGA-Ⅱ进行优化计算,通过与单目标优化方法求得最优结果的对比,表明用多目标优化方法进行零件制作方向的优化计算,不仅可以求出比单目标方法更优的解,而且通过一次优化计算就可得到多个较优的零件制作方向.%The effect of part building orientation on the part's surface quality, the needed supporting area and building time is analyzed in the processing of rapid prototyping, and their optimizing models are established. The multi-objective optimizing generic algorithm of NSGA-Ⅱbased on Pareto optimal solutions are used to seek the optimum solutions. Compared with the results gained by the single-objective optimizing way, it is shown that not only the better solution is gained but also many Pareto optimal solutions can be gained in one optimizing computing by NSGA-Ⅱ.