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FE-SEA hybrid model analysis precision correction method for automobile lower body

A FE-SEA and hybrid model technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem that the FE-SEA model cannot accurately predict the experimental results

Pending Publication Date: 2021-05-14
CHINA AUTOMOTIVE ENG RES INST
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Problems solved by technology

[0005] The invention provides a FE-SEA hybrid model analysis accuracy correction method for the lower body of the automobile, which solves the technical problem that the FE-SEA model cannot accurately predict the experimental results due to the special structure of the lower body

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  • FE-SEA hybrid model analysis precision correction method for automobile lower body

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Embodiment 1

[0038] The embodiment of the FE-SEA hybrid model analysis accuracy correction method used for the lower body of the automobile is basically as attached figure 1 shown, including steps:

[0039] S1. Obtain the modal, transfer function and sound pressure response through experiments;

[0040] S2. Obtain the main excitation of the lower body through the test;

[0041] S3, load excitation to the car body model under FE-SEA to solve;

[0042] S4. Judging whether the sound pressure response analysis results of the test and simulation are greater than the preset threshold, and adjusting the damping loss factor and envelope coverage of the model;

[0043] S5, judging whether there is an error in the modal test and simulation of the lower car body, and adjusting the grid size of the beam finite element model;

[0044] S6. Repeat S4-S5 until the error meets the preset requirement.

[0045] To improve the NVH characteristics of a car, first of all, it is the control of its vibration ...

Embodiment 2

[0061] The only difference from Embodiment 1 is that, since porous materials are widely used in the automobile industry, the experiments and simulation analyzes are performed on porous materials. For porous materials, there are interpenetrating or closed pores, and a small amount of gas may exist in these pores. Because the thermal conductivity coefficient of gas is different from that of porous materials, in environments with large temperature differences, such as the temperature difference between indoors and outdoors in winter in Northeast my country, the temperature difference between indoors and outdoors can reach 20-30 °C, and the temperature distribution of porous materials is not uniform, making experiments and simulations difficult. The results can not truly reflect the actual situation, so it is necessary to take measures for temperature compensation.

[0062] In this embodiment, before the porous material is simulated and analyzed, the following operations are perfor...

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Abstract

The invention relates to the technical field of digital simulation models, in particular to an FE-SEA hybrid model analysis precision correction method for a lower automobile body of an automobile, which comprises the following steps: S1, obtaining a modal, a transfer function and a sound pressure response through a test; s2, obtaining main excitation of the lower vehicle body through a test; s3, loading excitation to the FE-SEA lower vehicle body model for solving; s4, judging whether a sound pressure response analysis result of the test and simulation is greater than a preset threshold value or not, and adjusting a damping loss factor and a package coverage rate of the model; s5, judging whether the modal test and simulation of the lower vehicle body monomer have errors or not, and adjusting the mesh size of the cross beam finite element model; and S6, repeating the steps S4 to S5 until the error meets the preset requirement. The method has the advantages that the simulation precision is improved by correcting the FE-SEA parameters and the mesh size of the finite element model, so that the FE-SEA model can accurately predict the lower vehicle body in the middle and high frequency bands.

Description

technical field [0001] The invention relates to the technical field of digital simulation models, in particular to an FE-SEA mixed model analysis accuracy correction method for the lower body of an automobile. Background technique [0002] The hybrid finite element statistical energy analysis method (FE-SEA) combines finite element analysis (finite element analysis, FEA) and statistical energy analysis (statistical energy analysis, SEA), and uses dynamic balance equation and power balance equation as a supplement to the SEA method. On the basis of the SEA model, the subsystems that have a greater impact on the response are refined to effectively improve the response prediction accuracy. However, when using FEA-SEA to study the medium and high frequency noise in the car, it is necessary to equate the aluminum profile of the body structure to a flat or curved surface subsystem, which will cause a change in the sound insulation of the panel, and the interior parts are equivalen...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F119/10G06F119/14
CPCG06F30/23G06F2119/10G06F2119/14
Inventor 蔡瑞姣李沛然邱斌蒋大勇
Owner CHINA AUTOMOTIVE ENG RES INST
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