A multi-objective optimization design method for inner diameter structure of hollow stepped shaft

Abstract

The present invention proposes a multi-objective optimization design method for the inner diameter structure of a hollow stepped shaft, comprising the following steps: step 1, establishing a finite element model of a hollow stepped shaft; The critical speed is the sub-objective, the inner diameter of the hollow stepped shaft is the design variable, and the multi-objective optimization model is constrained by the allowable stress, torsional stiffness, and maximum operating speed of the material; step 3, estimate the size range of the inner diameter, based on the response surface method, determine the sample data sampling plan; step 4, based on the sampling plan, sequentially perform finite element simulation of four sub-objectives; step 5, carry out dimensionless response surface equations of the four sub-objectives, and transform the optimization direction of the sub-objective function; Step 6. Construct the global optimization objective function, and use the standard particle swarm optimization algorithm to optimize the global objective. The invention transforms the lightweight design of the hollow stepped shaft from multi-objective to single-objective, and realizes multi-objective collaborative optimization.

Description

technical field [0001] The invention relates to the technical field of motor shafts, in particular to a multi-objective optimization design method for the inner diameter structure of a hollow stepped shaft. Background technique [0002] my country has always advocated the road of green and sustainable development, so the automotive industry is paying more and more attention to energy-saving and emission-reduction technologies. In terms of the design of new energy vehicles, the lightweight of key components is particularly important. According to relevant data, every 1% reduction in the overall mass of the vehicle can reduce energy consumption by 5%. The lightweight research of new energy vehicles mainly follows three aspects. The first is the design and analysis of key components, with the focus on finding key factors and design solutions for vehicle lightweighting. The second is to select new materials to solve the lightweight problem. The last is to improve the manufactu...

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Problems solved by technology

[0004] In view of this, the present invention proposes a multi-objective optimization design method for the inner diameter structure of the hollow stepped shaft, which overcomes the defects of single optimization target and few design variables in the design process of the hollow shaft, and solves the problem of repeated checking in the design process. It provides a simple and feasible method for the lightweight design of the motor shaft from solid to hollow, thereby shortening the design cycle of the hollow stepped shaft, improving work efficiency and saving design costs

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