Environmental excitation data multiple-test-based Bayesian model correction method

A Bayesian model and environment-inspired technology, applied in complex mathematical operations, character and pattern recognition, instruments, etc.

Active Publication Date: 2017-06-27
TONGJI UNIV
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[0008] The technical scheme of the present invention can be used to solve

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  • Environmental excitation data multiple-test-based Bayesian model correction method
  • Environmental excitation data multiple-test-based Bayesian model correction method
  • Environmental excitation data multiple-test-based Bayesian model correction method

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Embodiment Construction

[0134] The present invention is based on the basic principle of structural dynamics, and constructs a posteriori probability density function (objective function) through derivation of measured data and structural mode parameters obtained by finite elements. This function includes the modal analysis results of multiple tests and the uncertainty of the identified modal parameters, etc., and can theoretically deduce the relationship between the two modal parameters of the natural frequency and mode shape in the objective function.

[0135] The overall framework of the method is shown in figure 1 As shown, it is divided into two stages. The inventive method is divided into two stages,

[0136] The first stage is to analyze the acceleration data of the structure under environmental excitation collected under multiple tests, obtain the natural frequency and mode shape of the structure measured by each test, and calculate the uncertainty of these modal parameters, using the covaria...

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Abstract

The present invention provides an environmental excitation data multiple-test-based Bayesian model correction method. The invention aims to eliminate the defects of a traditional method. With the method adopted, data obtained by multiple tests can be directly processed and analyzed; modal parameters obtained by the tests can be inputted by one step, and a model correction result is directly outputted. The method provided by the technical schemes of the invention can be used for solving the correction problem of actual test data-based finite element model. The method of the invention is divided into two stages. In the first stage, the acceleration data of a structure under environmental excitation which are acquired by the multiple tests are analyzed, so that the natural frequency and vibration mode of the structure which are measured by each test can be obtained; and the nondeterminacy of the modal parameters is calculated, and the modal parameters are represented by a covariance matrix. In the second stage, the optimal values of the model parameters of the finite element model requiring to be corrected are obtained through optimizing an objective function and based on the modal data parameters of the structure which are obtained based on the multiple tests and the covariance matrix thereof as well as the objective function built according to the Bayesian theory.

Description

technical field [0001] The invention relates to a structure finite element model correction technology. Background technique [0002] When doing structural design in the civil engineering field, a finite element model is usually established. After the structure is built based on the design drawings, some natural mode parameters of the structure include natural frequencies, damping ratios, mode shapes, etc. and are calculated based on finite element modeling. There is a clear difference in the results. Model correction technology is to correct the finite element model based on the structural modal parameters identified by the measured data, so as to obtain a more accurate finite element model, which will serve the subsequent structural health monitoring and damage identification. [0003] The existing technology has the following two problems: [0004] The first problem is that in the actual vibration test process, the number of sensors is often less than the number of meas...

Claims

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Application Information

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IPC IPC(8): G06K9/03G06F17/18
CPCG06F17/18G06V10/98
Inventor 张凤亮倪艳春
Owner TONGJI UNIV
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