Coachbuilt body combination property index modelling approach based on support vector machine

Abstract

The present invention provides an actuarial modeling method based on the car body combination property index of support vector machine, belonging to auto structure optimization design field, including step 1, selecting parts as design object, and determining thickness of parts, material parameter as design variable; step 2, adopting testing design method to generate design matrix according to the design variable determined by step 1; step 3, processing finite element simulation testing design according to the design matrix, extracting structural performance index value to complete the establishment of the training sample; step 4, training sample by supporting vector machine method, establishing combination property index mathematic model; step 5, verifying the established combination property index mathematic model by checking index; step 6, establishing adaptive process after verifying the high precision combination property index mathematic model. The invention is fit for nonlinear response index mathematical modeling having multiple variables, high structural performance, having high precision of the model prediction, high efficiency of modeling, high feasibility of optimum design.

Description

technical field [0001] The invention relates to a design method in the field of automobile technology, in particular to a method for modeling comprehensive performance indexes of a car body based on a support vector machine. Background technique [0002] With the rapid development of the automobile industry, the optimization design technology of the body structure has been gradually applied, so that the body structure has the best comprehensive performance and can reduce its own weight as much as possible. In the optimization design modeling process of car body structure, it is necessary to establish a mathematical relationship model between various comprehensive performance indicators and design variables, and car collision is a transient, large deformation, highly nonlinear physical process, including collision force, acceleration, The crashworthiness safety performance indicators including structural deformation and energy absorption have strong nonlinear characteristics....

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Problems solved by technology

[0004] After searching the existing technical literature, it was found that Wang Hailiang, Lin Zhongqin, and Jin Xianlong published an article "Optimized Design of Crashworthiness of Thin-walled Components Based on Response Surface Model" in "Journal of Applied Mechanics" 2003, (3): 61-66 In this paper, the second-order polynomial model is used to establish the mathematical model of the crashworthiness index (crash index, maximum impact force, and average impact force) of the body structure, and the variance analysis is only used as a verification method in the modeling process, and no additional parameters are included in the design space. Select a certain number of random and evenly distributed samples for response prediction test, so it cannot be considered that the established mathematical model has sufficient accuracy for subsequent optimization design

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