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

Abstract

The invention provides a multi-objective optimization design method for an inner diameter structure of a hollow stepped shaft. The multi-objective optimization design method comprises the following operation steps: 1, establishing a finite element model of the hollow stepped shaft; 2, establishing a multi-objective optimization model which takes mass, limit stress, a torsion angle and a first-order critical rotating speed as sub-objectives, takes the inner diameter of the hollow stepped shaft as a design variable, and takes allowable stress, anti-torsion rigidity and maximum working rotating speed of a material as constraints; 3, estimating the size range of the inner diameter, and determining a sample data sampling scheme based on a response surface method; 4, on the basis of the sampling scheme, carrying out finite element simulation of the four sub-targets in sequence; 5, performing nondimensionalization on the response surface equations of the four sub-targets, and converting the optimization direction of the sub-target function; and 6, constructing a global optimization objective function, and optimizing a global objective by adopting a standard particle swarm algorithm. According to the method, the lightweight design of the hollow stepped shaft is converted into a single target from a multi-target mode, and multi-target collaborative optimization is achieved.

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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