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Multistep effective method for finite element model updating

A model correction, finite element technology, applied in the field of finite element model correction, can solve the problems of model correction technology application limitations, modeling uncertainty, interference and other problems

Inactive Publication Date: 2013-04-24
LUDONG UNIVERSITY
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Problems solved by technology

From an engineering point of view, civil engineering structures are usually more complex, finite element modeling has many uncertainties, limited by test conditions, the amount of measured information is very limited, and is disturbed by noise, so that model correction technology is widely used in civil engineering. Applications in the

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  • Multistep effective method for finite element model updating
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  • Multistep effective method for finite element model updating

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specific Embodiment

[0046] Specific examples are as follows, and the scope of protection of the present invention is not limited to the following examples.

[0047] 1. Establish a finite element model

[0048] The embodiment of the present invention is a simplified model of a jacket platform, and the structure is composed of columns, horizontal braces, diagonal braces and decks, etc. There are 72 rod units and 5 surface units, such as figure 1 shown. Use Matlab to write the finite element program and establish the finite element model. The measured model of the structure is simulated by changing the elastic modulus or density of some elements of the finite element model, that is, the stiffness correction coefficient α and mass correction coefficient β of the preset elements.

[0049] In this calculation example, different parameters of 7 units are set as objects, such as figure 2 As shown, the default correction coefficient values ​​are -0.2. It is assumed that the measured model only recogn...

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Abstract

The invention provides a multistep effective method for finite element model updating. Based on the conventional model updating method, updated parameters are arranged, classified, optimized and selected by building sensitivity information array. Then the finite low-order modal information is obtained by employing the structural vibration measurement to update the finite element model step by step. The method has the advantage of solving the problem of ill conditioning of a one-time solution to the model updating equation sets in conventional method, therefore reducing the impact on updating solution from measuring error, giving physical significance to the updating.

Description

technical field [0001] This invention relates to a new efficient and reliable finite element model correction method applied to civil engineering structures, which can use the limited low-order modal information obtained from structural vibration tests to correct some preferred finite element models step by step parameters, so that the revised model can more accurately reflect the dynamic characteristics of the actual structure. Background technique [0002] As we all know, the finite element method (FEM) has become the most common method for establishing numerical models in the process of civil engineering structure design, safety assessment, etc. However, due to the uncertainty of some parameters of the actual structure, as well as the simplification of the finite element model and the irrationality of unit division, there are errors between the finite element model and the actual structure. The finite element model correction is to use the data obtained from the actual s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 李英超王树青倪宏革张敏孟珣杨彬
Owner LUDONG UNIVERSITY
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