Method for realizing optimization of vehicle body structure on basis of normal rigidity analysis of metal plates of vehicle body

Abstract

The invention relates to a method for realizing optimization of a vehicle body structure on the basis of normal rigidity analysis of metal plates of a vehicle body, which includes: acquiring rigidity matrix (K) of nodes of the vehicle body by performing finite element computing and processing, acquiring a shift matrix (U) of the nodes of the vehicle body according to a formula (U)=(K)-1(F), setting the (F) as a force matrix formed by force applied on each node of the vehicle body and a (K)-1 as an inverse matrix of the rigidity matrix (K); projecting the inverse matrix (K)-1 to the normal direction of the nodes of the vehicle body so as to acquire the inverse matrix (Kn)-1 of the normal rigidity matrix (Kn) of the nodes of the vehicle body, and acquiring a normal shift matrix (Un) of the nodes of the vehicle body according to a formula (Un)=(Kn)-1; converting the acquired normal shift matrix (Un) into the format which can be identified by finite element post-processing software, importing the finite element post-processing software to display a normal shift cloud map of the nodes of the vehicle body; and determining the weak area of rigidity of the metal plates of the vehicle bodyaccording to the display result of the normal shift cloud map of the nodes of the vehicles so as to optimize the vehicle body structure conveniently. By the method for realizing optimization of the vehicle body structure on the basis of normal rigidity analysis of the metal plates of the vehicle body, the technical scheme of optimization of the vehicle body can be effectively provided and implemented, and the defects of waste and consumption and the like in the prior art are overcome.

Description

【Technical field】 [0001] The invention relates to a method for realizing the optimization of the body structure, in particular to a method for realizing the optimization of the body structure based on the analysis of the normal stiffness of the body sheet metal. 【Background technique】 [0002] In the existing body structure design, the normal stiffness and sound radiation characteristics of the body sheet metal are rarely considered, and there is no ready-made application software for calculation in this regard. For example, in the patent document whose publication number is CN101718630A, titled "Car Door Trim Panel Impactor and Method for Determining the Stiffness Value of Car Door Trim Panel", it provides a The method of obtaining the stiffness value to optimize the structure of the interior panel by the dynamic parameters of the dynamic parameters, but in this document does not disclose any analysis of the normal stiffness characteristics of the interior panel structure. ...

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Problems solved by technology

As another example, in the patent document with the publication number CN1815229 and titled "A Method for Predicting Structural Acoustic Radiation of Automobile Skin Surface Damping Treatment", it is disclosed that a finite element model is first performed on the automobile skin surface damping treatment structure, Then the sound radiation analysis and calculation method is carried out to solve the sound radiation prediction problem after the structural surface damping treatment. In this method, the analysis and calculation process of the normal stiffness of the structure are also not involved.

[0003] In addition, in the prior art, the design of body damping is often done based on experience, and the existing software does not provide this function, which makes it impossible to provide and implement scientific damping effectively Optimizing the scheme, resulting in unnecessary waste of materials, manpower, and working hours, and it is also not conducive to the realization of realistic and positive goals such as vehicle weight reduction, fuel consumption economy and efficiency, low carbon, and low consumption.

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