Multi-target multi-constraint performance balance-considered robust optimization design method for mechanical structures

Abstract

The invention discloses a multi-target multi-constraint performance balance-considered robust optimization design method for mechanical structures. The method comprises the following steps of: considering uncertain factors of an interval form; establishing a multi-target multi-constraint performance-considered robust optimization design model for mechanical structures; at the inner layer of a double-layer nested genetic algorithm, calculating left and right boundaries for mechanical structure performance indexes on the basis of an approximate prediction model; at the outer layer of the double-layer nested genetic algorithm, judging the feasibility of design vectors; carrying out robustness balance classification on feasible solutions on the basis of a robust balance coefficient of intervalconstraint performance and a robust balance coefficient of interval target performance; and sorting the design vectors on the basis of an overall distance of target performance robustness, so as to solve the multi-target multi-constraint performance-considered robust optimization design model for mechanical structures. According to the method, high robust level of constraint performance can be ensured, the optimization results are more objective, and the structure performance is robust and balanced on the whole.

Description

technical field [0001] The invention belongs to the field of mechanical structure optimization design, and relates to a mechanical structure robust optimization design method considering multi-objective multi-constraint performance balance. Background technique [0002] As the performance requirements of complex equipment continue to increase, designers need to consider more and more performance indicators when optimizing the structure of key components. Due to the influence of uncertain factors and the requirements of robust design, the mean value and fluctuation of structural performance indicators need to be considered during the optimization process, which increases the number of objectives and constraints to be optimized, and these objectives and constraints often conflict and restrict each other. . However, domestic and foreign scholars usually only consider the robustness of single-objective multi-constraint performance in the research on the multi-performance robust...

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Problems solved by technology

However, domestic and foreign scholars usually only consider the robustness of single-objective multi-constraint performance in the research on the multi-performance robust optimization design of mechanical structures using interval numbers to represent uncertain factors, and do not consider the robust optimization problem of multi-objective performance balance. Guarantee the overall robustness of mechanical structure performance

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