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Correction method of matrix dynamics model based on structure modal test

A dynamic model and structural modal technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as the difficulty of adding quality, affecting the correction accuracy, and the accuracy of the correction amount of the solution equation is very poor

Inactive Publication Date: 2010-08-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, it is often difficult to add mass in practice, because the mass often has a certain volume and inertia, but they are ignored in the model correction; and the connection between the additional mass and the structure inevitably introduces stiffness, which affects the correction precision
In addition, when the number of test modes is small, since the number of unknowns in the identification equation is greater than the number of equations, the accuracy of the correction value obtained by solving the equation will also be poor

Method used

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  • Correction method of matrix dynamics model based on structure modal test
  • Correction method of matrix dynamics model based on structure modal test
  • Correction method of matrix dynamics model based on structure modal test

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Embodiment Construction

[0068] The technical scheme of the invention will be described in detail below in conjunction with the drawings:

[0069] The number of degrees of freedom of the finite element model established in actual engineering is much greater than the degrees of freedom of the modal test, but the modal polycondensation method proposed by Kammer and Serep can be used to make the degrees of freedom of the finite element model consistent with the degrees of freedom of the modal test. Therefore, the present invention assumes that the degree of freedom of the finite element model is consistent with the position and quantity of the degree of freedom of the modal test.

[0070] First, perform modal test on the original structure to obtain the vibration shape Φ and frequency Λ of the original structure; then change the mass distribution of the structure several times (such as fixing masses of known light and heavy weight at different positions) and structural rigidity (such as increasing Fix constra...

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Abstract

The invention discloses a correction method of a matrix dynamics model based on a structure modal test, which comprises the following steps of: calculating correction quantities of a mass matrix and a rigid matrix of a finite element model by using a modal experiment result of a new structure generated through simultaneously changing mass distribution and rigidity of the structure for many times and using matrix calculation and algebraic equation solution. The method improves the correction precision of the finite element model with simpleness and feasibility.

Description

Technical field [0001] The invention relates to a matrix type dynamic model correction method based on modal tests, in particular to the correction of the dynamic model determined by the structural error position or unit. Background technique [0002] At present, there are two major types of methods for finite element model modification using structural dynamics modal test results. One is the parametric correction method, which is to correct the physical parameters of the structural model by solving the sensitivity. The other type is the matrix correction method proposed by scholars such as Berman, J.C. Chen, Friswell, etc., to correct the entire mass matrix and stiffness matrix of the model. However, the experimental data obtained from the modal test of a structural system is limited, and it is often not enough to identify the dynamic model well. In recent years, CHA et al. have proposed to modify the model by measuring the original structural dynamic system mode and the struc...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 王轲姚雅静
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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