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Method for solving material elastic modulus parameter based on least square method

A technology of material elastic modulus and least square method, which is applied in the field of solving material elastic modulus parameters, can solve the problem of high cost

Pending Publication Date: 2021-05-28
CHINA AUTOMOTIVE ENG RES INST
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Problems solved by technology

[0003] At present, it is usually necessary to use special material performance testing equipment to measure the elastic modulus of the material, and the material performance testing equipment needs to be purchased separately, and the cost is relatively high

Method used

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  • Method for solving material elastic modulus parameter based on least square method
  • Method for solving material elastic modulus parameter based on least square method
  • Method for solving material elastic modulus parameter based on least square method

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Embodiment Construction

[0040] Further detailed explanation through specific implementation mode below:

[0041] as attached figure 1 As shown, the method for solving the elastic modulus parameter of a material based on the least squares method provided by the embodiment of the present invention specifically includes steps S1-S3, and there is no restriction on the execution order of S1 and S2.

[0042] S1. Carry out free modal tests on material samples, and obtain the first k order non-rigid body free modal test frequency values ​​F = [F1, F2,..., Fk], F1, F2,..., Fk represent the first order to The test frequency value of the k-th order non-rigid free mode.

[0043] This step specifically includes:

[0044] S11. The material sample is excited by a vibrator in a free static state, and the mechanical admittance function between any two points is obtained by measuring the exciting force and response and performing a dual-channel fast Fourier transform analysis;

[0045]S12. Use modal analysis theory...

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Abstract

The invention relates to the field of NVH (Noise Vibration and Harshness) materials, and particularly discloses a method for solving a material elastic modulus parameter based on a least square method, which comprises the following steps of: performing a free modal test on a material sample to obtain a first k-order non-rigid modal test frequency value; constructing a modal solution boundary condition of the material sample, setting an elastic modulus parameter of the material sample as a variable, and solving a first k-order non-rigid modal theoretical frequency value; and based on a least square method and the non-rigid modal test frequency value, constructing an optimization model of the non-rigid modal theoretical frequency value, and solving an elastic modulus parameter of the material sample according to a set optimization model target. According to the method, the elastic modulus parameter of the material sample is solved by combining the modal test and the finite element analysis, so that special material performance testing equipment can be avoided, and the cost is saved; moreover, the scheme constructs the optimization model based on the least square method, and has the advantages of high fitting degree and easy implementation, so that the accuracy of the solved elastic modulus parameter is relatively high, and the solving process is simple.

Description

technical field [0001] The invention relates to the field of NVH materials, in particular to a method for solving material elastic modulus parameters based on the least square method. Background technique [0002] With the increasingly fierce competition in the automobile market and the improvement of consumers' requirements for automobile products, future automobiles will continue to advance in the direction of safety, environmental protection, low cost, informatization, and comfort. Consumers' satisfaction with car comfort is mainly reflected in their satisfaction with the overall NVH (Noise, Vibration, Harshness) performance of the car, that is, consumers need low noise, low vibration, driving Smooth experience. According to incomplete statistics, about 1 / 3 of customer dissatisfaction surveys are related to NVH performance; about 1 / 5 of after-sales service is related to NVH performance. Therefore, for automobile manufacturers, it is particularly urgent to improve the NV...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F17/14G06F17/18
CPCG06F30/23G06F17/142G06F17/18Y02T90/00
Inventor 蒋大勇邱斌李沛然
Owner CHINA AUTOMOTIVE ENG RES INST
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