叉吊搬运车横梁结构系统6σ稳健优化设计

6σ robust optimization design for beam structure system of fork lift truck

论述某型叉吊搬运车横梁结构系统基于6σ理论的校核分析及优化,以提高其可靠性。传统优化方法在设计过程中大多不考虑设计变量中不确定性因素的波动对设计结果的影响,稳健性较低,容易导致产品性能违反约束条件。文中将Kriging代理模型与蒙特卡洛模拟法、6σ质量设计集成运用,对横梁结构系统进行了6σ稳健优化设计。优化结果表明,结构尺寸分布更加合理,在实现轻量化的同时可使可靠性水平提高至8σ,可靠度增加至接近100%,大大提高了优化结果的稳健性,为全面解决同类非线性隐式工程结构问题提供了一定的理论支持和应用借鉴。

This paper discusses the check analysis and optimization of the beam structure system of a fork lift truck based on the 6σtheory in order to improve its reliability.In design process,most of the traditional optimization methods omit the influence of uncertainty factors in design variables on the design results,which also leads to low robustness and product performance violation to constraint conditions.In this paper,Kriging Surrogate Model,Monte Carlo Simulation and 6σquality design are integrated together to carry out 6σrobust optimization design on the beam structure system.The optimization results show that the size distribution of the structure is more reasonable,the reliability level can be increased to 8σand the reliability can be increased to close to 100%while lightweight is realized,which greatly improves the robustness of the optimization results and provides certain theoretical support and application reference for comprehensively solving structure problems of similar nonlinear concealed engineering.