Study on MRLS direction pipe's multi-objective optimization and multi-attribute decision making

A multi-objective optimization model of multi-rocket launch system (MRLS) composite material direction pipe was established for the structure design requirements by using non-dominated sorting genetic algorithm II (NSGA-II), on the basis of finite element analysis method and optimization method. The composite material direction pipe's ply thickness, lamination angle and middle location value were defined as design variables. The direction pipe's natural frequency and mass were regarded as optimization objectives. The Pareto-optimal solution set of the direction pipe was obtained, and then the decision matrix was constructed by the set. The objective weight information entropy approach was adopted to calculate the weights of attributes, also the multi-attribute decision making (MADM) was applied to rank the Pareto-optimal solutions and determine the best solution based on the technique for order preference by similarity to ideal solution (TOPSIS) method. Comparisons of the direction pipe's properties by specific stiffness structural efficiency show that the optimization design is effective.