关键词: 桥式龙门铣床, 横梁, 正交试验设计, 模糊层次分析法, 灰色关联分析

Abstract: To solve the problem of structural scheme design and optimal selection of crossbeam,a design of crossbeam scheme and its multi-objective decision-making method based on orthogonal experimental design,Fuzzy Analytic Hierarchy Process (FAHP) and Grey Relational Analysis (GRA) was proposed.According to the multi-factor and multi-level characteristics of crossbeam structure design,the orthogonal experimental design method was used to determine alternative schemes of crossbeam and obtain the decision-making index value of each scheme.Taking the static mechanical performance,vibration resistance,lightweight performance and economic index as the main decision-making targets,the decision-making index system of crossbeam design scheme was established,and the multi-objective decision making of crossbeam design schemes was carried out by using FAHP and GRA.The method was applied to the design and decision making of the crossbeam scheme of bridge gantry milling machine,so that the optimal crossbeam design scheme with parameters combination “side hanging—well —20mm—linear guideway” was selected from eight established alternative schemes of crossbeam.The study result showed that the design of crossbeam scheme and its multi-objective decision-making method proposed was strongly theoretical and had good convergence of decision solving and high engineering practicability.

Key words: bridge gantry milling machine, crossbeam, orthogonal experimental design, fuzzy analytic hierarchy process, grey relational analysis