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
CN101794338AInactive Publication Date: 2010-08-04NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Publication Date
2010-08-04
Estimated Expiration
Not applicable ยท inactive patent

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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.
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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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