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Physical mode extraction method for engineering structure flexibility identification

A technology of engineering structure and extraction method, applied in special data processing applications, geometric CAD, design optimization/simulation, etc., to achieve the effect of accurate flexibility information

Active Publication Date: 2020-06-12
DALIAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0004] The present invention aims to provide a new physical mode extraction method for engineering structure mode recognition to solve the problem of false mode elimination in the process of flexibility identification

Method used

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  • Physical mode extraction method for engineering structure flexibility identification
  • Physical mode extraction method for engineering structure flexibility identification
  • Physical mode extraction method for engineering structure flexibility identification

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Experimental program
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specific Embodiment approach

[0049] The specific implementation of the method is as follows:

[0050] (1) Collect the acceleration responses of nodes 1 to 5 and the input force data of node 5. And use the input and output data to build the Hankel matrix U 0|2v-1 and Y 0|2v-1 .

[0051] (2) Utilize the Hankel matrix to calculate the projection matrix O v And perform a singular value decomposition on the projection matrix:

[0052]

[0053] where S 1 is the singular value matrix; U 1 and V 1 is a unitary matrix.

[0054] (3) Set the initial calculation order k to 2. Make the singular value matrix S 1 The number of rows and columns is equal to the set calculation order. The frequencies are then calculated using the deterministic random subspace method Damping Mode shape and modal scaling factor

[0055] (4) Increment the calculation order with a step size of 2 until the maximum calculation order is 150(n max =150) and repeat step (3) to calculate the modal parameters under different ca...

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Abstract

The invention belongs to the technical field of engineering structure detection data analysis, and provides a physical mode extraction method for engineering structure flexibility identification. According to the method, basic modal parameters and modal scaling coefficients are calculated from state space models of different orders through a determination-random subspace identification method. Andthen, adding the relative zoom coefficient tolerance as a new modal index into the classic stability diagram, thereby obtaining a clearer stability diagram. And calculating a single-order modal frequency domain similarity index by utilizing the single-order frequency response function and the actually measured frequency response function to judge whether the selected stable axis is correct or not. Then, calculating a multi-order modal frequency domain similarity index by utilizing a low-order superposition frequency response function and an actually measured frequency response function, and further determining a physical modal in each stable axis; and finally, calculating a flexibility matrix by utilizing the identified modal parameters, and achieving the purpose of predicting the displacement of the structure under the action of any static load.

Description

technical field [0001] The invention belongs to the technical field of engineering structure detection data analysis, and relates to a physical mode extraction method for engineering structure flexibility identification. Background technique [0002] Structural health monitoring technology based on structural vibration information has received extensive attention in civil engineering and is considered to be one of the most effective ways to improve the safety of engineering structures and achieve long life and sustainable management of structures. In recent decades, engineers and technicians have paid more and more attention to rapid test methods for small and medium-span bridges, such as shock and vibration tests. In addition to obtaining the basic modal parameters (frequency, damping, mode shape) of the bridge, the modal scaling coefficient of the structure can also be obtained through dynamic tests, so as to obtain the deep-level parameters (flexibility) of the structure....

Claims

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Application Information

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IPC IPC(8): G06F30/13G06F30/20
CPCG06F30/13G06F30/20G06F2111/08
Inventor 伊廷华薛铭圣曲春绪李宏男
Owner DALIAN UNIV OF TECH
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