Data processing packet modeling method for decoupling mode of lightweight design of car body

Abstract

The invention discloses a data processing packet modeling method for a decoupling mode of a lightweight design of a car body. The data processing packet modeling method comprises the following steps of: decoupling a response function into uncoupling terms and first-order coupling terms; preliminarily judging the number of terms required for constructing a model; constructing every uncoupling term, and judging whether the uncoupling terms are nonlinear or not; repeating the step of constructing every uncoupling term until all the uncoupling terms are constructed to obtain a preliminary an approximation model formed by the pure uncoupling terms and comparing the approximation model with a true model; identifying whether the first-order coupling terms exist or not; if the first-order coupling terms exist, identifying associations of variables coupled with each other, and constructing corresponding coupling terms by using the approximation model technique; repeating the step of identifying whether the first-order coupling terms exist or not until all the first-order coupling terms are identified to obtain a global approximation model and optimizing the global approximation model; and entering an iteration step if a condition of convergence is not satisfied. The data processing packet modeling method disclosed by the invention has the advantages that the principle is simple; the constructing requirement of the high-dimensional approximation model required by engineering can be met; the solving precision is ensured; and the efficiency of an optimization algorithm of the approximation model is improved.

Description

technical field [0001] The present invention mainly relates to the field of vehicle body optimization design, in particular to a decoupling mode data processing group modeling method suitable for vehicle body lightweight design, which is mainly used to construct an approximate model structure for vehicle body lightweight design. Background technique [0002] "Safety, energy saving, and environmental protection" are the three major themes in the development of contemporary automobiles, and safety issues (that is, crashworthiness issues) rank first. At present, energy issues are attracting attention in the context of rising international oil prices. According to statistics, the fuel consumption of motor vehicles in my country has accounted for more than 30% of the country's total fuel consumption. Therefore, the most urgent problem is to reduce the consumption of oil resources to the greatest extent, alleviate the coming of the energy crisis as much as possible, and buy time f...

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Problems solved by technology

[0008] The GMDH method also has deficiencies, such as the large number of variables, the large amount of calculation and the large number of intermediate variables, etc., which bring difficulties to the reasonable selection of intermediate variables; using quadratic polynomials as part of the expression, the error generated in the case of multi-variables is relatively large; GMDH simulates The accuracy of data with strong nonlinearity is relatively poor. If more levels or more complex and high-order polynomials are used to pursue accuracy, it may enter a dead end of overfitting; for nonlinear models that require time-consuming calculations for positive problems, the number of iterations Too many, resulting in low efficiency in constructing the model; the final expression contains many variables, which cannot be optimized according to the mathematical model, etc.

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