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Pure electric vehicle frame lightweight method based on nonlinear programming

A non-linear programming, pure electric vehicle technology, applied in electrical digital data processing, design optimization/simulation, special data processing applications, etc. Achieve the effect of improving optimization accuracy, simple principle, and improving optimization efficiency

Inactive Publication Date: 2019-08-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current frame lightweight methods mostly use the optimization method combining approximate surrogate model and genetic algorithm, ant colony algorithm, and neural network. This method requires repeated iterative solutions, which is time-consuming and has a large solution error.
Moreover, the existing lightweight methods based on finite element simulation all lighten the frame under one or two simple typical working conditions. These simple typical working conditions are quite different from the actual working conditions. The result of light weight of the frame has a large error
In summary, the current research on frame lightweighting lacks an accurate and efficient optimization method that considers multiple working conditions

Method used

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  • Pure electric vehicle frame lightweight method based on nonlinear programming
  • Pure electric vehicle frame lightweight method based on nonlinear programming
  • Pure electric vehicle frame lightweight method based on nonlinear programming

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Embodiment Construction

[0038] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0039] Such as figure 1 As shown, a kind of non-linear programming based pure electric vehicle frame lightweight method provided by the present invention comprises the following steps:

[0040] S1. Establish the finite element model of the frame, establish finite element modeling for the four working conditions of the frame, frontal collision, free mode, bending stiffness and torsional stiffness, and simulate the finite element model of the four working conditions of the frame Analysis; includes the following substeps:

[0041] S11, figure 2 For the three-dimensional model diagram of the pure electric vehicle frame in this embodiment, the frame is simplified in UG, and imported into Hypermesh to further simplify the geometric model;

[0042]S12. Extract the surface of the part, select the mesh type, divide the mesh, assign mesh material pr...

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Abstract

The invention discloses a pure electric vehicle frame lightweight method based on nonlinear programming. The method comprises the following steps of S1, establishing a finite element model of a frame;S2, determining an optimized objective function and an optimized design variable, and solving a mathematical expression of the objective function by means of the Hypermesh software; S3, determining an optimized constraint condition, and collecting the sample data of each constraint response; S4, processing the sample data, performing function fitting on each constraint response by using a second-order response surface model, and solving an approximate agent model of each constraint; and S5, constructing a nonlinear programming model by using the agent model of each constraint and the mathematical expression of the objective function, and solving the optimization model. According to the method, by adopting the nonlinear programming model, and using the Lingo software for solving and optimizing, the optimal solution can be obtained within the extremely short time, and the optimization efficiency is greatly improved. The optimization method has the characteristics of simple principle, high solution rate, high optimization precision and the like.

Description

technical field [0001] The invention belongs to the field of lightweight design of a pure electric vehicle frame, in particular to a method for lightweighting a pure electric vehicle frame based on nonlinear programming. Background technique [0002] The lightweight of electric vehicles is to reduce the total mass of electric vehicles on the premise of ensuring that the passive safety, handling stability, ride comfort, NVH performance and structural strength of the whole vehicle are not affected. Since the frame bears most of the weight of the vehicle and is an important part of the vehicle, the vehicle has high requirements on the structural strength of the frame. The frame also accounts for a relatively large proportion of the weight of the vehicle. The weight reduction of the frame is the focus of reducing the weight of the vehicle and plays a very important role in the weight reduction of the vehicle. The lightweight design of pure electric vehicles in the early stage c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/15G06F30/23
Inventor 鲁聪闫闯杨潇康财杰陈保安
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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