Optimization method of vehicle drag coefficient based on adaptive surrogate model

An adaptive proxy and drag coefficient technology, which is applied in design optimization/simulation, special data processing applications, geometric CAD, etc., can solve problems such as low optimization efficiency, complicated operation, and long time consumption, and meet the requirements of reducing R&D costs and engineering experience Low, the effect of reducing the number of calls

Active Publication Date: 2022-05-13
CATARC AUTOMOTIVE TEST CENT TIANJIN CO LTD +1
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Problems solved by technology

Due to the complex structure of the vehicle flow field, which presents a high degree of nonlinearity, it is very difficult to study the optimization of the vehicle drag coefficient. The optimization efficiency is low, the operation is complicated, and it takes a long time.

Method used

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  • Optimization method of vehicle drag coefficient based on adaptive surrogate model

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Embodiment Construction

[0033] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0034] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0035] Such as figure 1 As shown, the vehicle drag coefficient optimization method based on the adaptive proxy model includes the following steps:

[0036] A. Carry out CFD simulation calculation on the initial model of the car to obtain the calculated value of the drag coefficient of the initial model;

[0037] B. Select the design variables and determine the variation range of the design variables;

[0038] C. Construct a parametric model based on the initial model;

[0039] D. Select a sample point and store it in the sample point database;

[0040] E. Calculate the drag coefficient calculation value corresponding to the sample point based on the parameterized model, and store it ...

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Abstract

The invention provides an automobile drag coefficient optimization method based on an adaptive agent model, comprising the following steps: performing CFD simulation calculation on the initial model of the automobile; selecting design variables and determining their variation range; constructing a parameterized model; selecting sample points and calculating The corresponding drag coefficient calculation value is stored in the sample point database; judging whether design variables need to be screened; constructing a proxy model; optimizing the proxy model to obtain the optimal solution and optimized value; The distance between the sample points and the absolute value of the difference between their corresponding drag coefficient calculation values ​​are used to obtain the increase point; the error between the minimum drag coefficient calculation value and the corresponding optimized value is calculated until the accuracy requirements are met. The beneficial effects of the invention are as follows: on the premise of ensuring the accuracy, the calling times of the complex real simulation model are reduced, the optimization efficiency of the drag coefficient of the automobile is improved, time and cost are saved, and the research and development cycle is shortened.

Description

technical field [0001] The invention belongs to the technical field of automobile aerodynamics, and in particular relates to an automobile drag coefficient optimization method based on an adaptive proxy model. Background technique [0002] With the continuous improvement of the fuel consumption evaluation index of fuel vehicles and the mileage requirements of new energy vehicles, it has become an urgent need for various OEMs to create a low wind resistance vehicle. The traditional method of reducing the drag coefficient of automobiles, which mainly relies on wind tunnel tests, is short of test resources and high in research and development costs, and cannot meet the requirements of modern automobile development efficiency. Reducing the drag coefficient through CFD simulation technology can effectively shorten the research and development cycle and reduce research and development costs, and has become an indispensable means in the process of automobile development and design....

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/15G06F30/28
CPCG06F30/15G06F30/28
Inventor 吴琳琳付宇卜晓兵李向荣马小乐兰吉
Owner CATARC AUTOMOTIVE TEST CENT TIANJIN CO LTD
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