Implementation method and device for solving response discontinuity and expensive optimization problem in lightweight structure design of automobile body
A technology for automobile body and structure design, applied in the direction of calculation, calculation model, computer parts, etc., can solve the problems of discontinuous and expensive optimization of response, difficult optimization of model accuracy, etc., to achieve the effect of improving search performance and convergence performance, and improving accuracy
Pending Publication Date: 2020-11-03
CENT SOUTH UNIV +1
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[0005] The purpose of the present invention is to overcome the influence of the discontinuous phenomenon on the model accuracy and the difficulty in optimization caused by the existence of the response discontinuity phenomenon in the lightweight structure design of the automobile body. A method for responding to discontinuous expensive optimization problems in the design of lightweight structures, comprising the following steps:
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[0034] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0035] In this embodiment, aiming at the optimization problem of discontinuous and expensive response in the lightweight structure design of the automobile body, a brand-new region division strategy is firstly designed. By locating the discontinuous response in the structural design, the initial design domain with Divide into several sub-regions with continuous responses. Then, for each sub-area, the differential evolution algorithm is used as a search engine to generate offspring populations, and the proxy model is used to evaluate the generated offspring populations to find more promising solutions. Finally, a better solution is obtained through a local surrogate model assisted search.
[0036] Figure 1 Shown is an example of a response discontinuity in the design of automotive lightweight structures. It can be seen that when a certain design varia...
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The invention discloses an implementation method and device for solving response discontinuity and expensive optimization problems in lightweight structure design of an automobile body. The method comprises the following steps: dividing an initial design domain with discontinuous response into a plurality of sub-regions with continuous response by positioning the discontinuous response in structural design through a region division strategy; for each sub-region, employing a differential evolution algorithm as a search engine to generate a filial generation population, and employing an agent model for carrying out model evaluation on the generated filial generation population to find a promising scheme; and finally, employing a local agent model for assisting in searching to obtain a betterscheme. According to the method, the problems that the model precision of the agent model is reduced and the optimization algorithm cannot be further optimized due to the discontinuous response phenomenon in the design of the lightweight structure of the automobile body are solved, and the method is of great significance to the design of the lightweight structure of the automobile body.
Description
technical field [0001] The invention belongs to the field of automobile lightweight and evolutionary calculation, and in particular relates to an implementation method and device for solving the discontinuous and expensive optimization problem in the lightweight structure design of automobile bodies. Background technique [0002] Automobile lightweight refers to the targeted reduction of the mass of the car body itself under the premise of ensuring its anti-collision performance remains unchanged or improved. In the field of automotive lightweight, different structural designs have a great impact on lightweight. Structural design optimization problems usually require a large amount of computing resources to evaluate the quality of the solution. For example, a car structure collision simulation takes several hours. This type of problem has always been one of the hottest issues in the field of automotive lightweighting. At the same time, in this type of problem, there are sti...
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IPC IPC(8): G06K9/62G06N3/00G06F30/15
CPCG06N3/006G06F30/15G06F18/23G06F18/214Y02T90/00
Inventor 王勇林剑清刘角孙光永庞通
Owner CENT SOUTH UNIV