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A Structural Damage Region Recognition Method Based on Weighted Least Squares of Sub-Frequency Bands

A weighted least squares and structural damage technology, which is applied to pattern recognition in signals, character and pattern recognition, instruments, etc., can solve the high-order modal misjudgment of mode shape curvature method, and there is no clear standard for the order number of flexibility curvature method and other issues to achieve high-precision results

Active Publication Date: 2022-03-29
DALIAN UNIV OF TECH
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Problems solved by technology

Although the existing damage identification methods can realize damage location in numerical simulation or laboratory structures, there are still many deficiencies, such as serious misjudgment of high-order modes by mode shape curvature method, and no clear standard for the number of orders selected by compliance curvature method. Wait

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  • A Structural Damage Region Recognition Method Based on Weighted Least Squares of Sub-Frequency Bands
  • A Structural Damage Region Recognition Method Based on Weighted Least Squares of Sub-Frequency Bands
  • A Structural Damage Region Recognition Method Based on Weighted Least Squares of Sub-Frequency Bands

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Embodiment Construction

[0062] Below in conjunction with accompanying drawing and specific embodiment the technical scheme of the present invention is described in further detail:

[0063] A structural damage area identification method based on weighted least squares of sub-frequency bands, the specific flow chart is shown in (1).

[0064] 1 identification method

[0065] 1.1 Modal parameter identification method

[0066] Select several monitoring points in the vertical direction of the structure, divide the structure into several areas by the elevation of the monitoring points, and use Chebyshev band-pass filter to divide the input and output signals of the structure into five frequencies in the frequency range of 1-100Hz. segment, using the energy of each frequency segment as a weight to perform weighted least squares parameter identification; and based on the ordinary kriging method to find the weight to perform least squares identification, and finally weighted summation.

[0067] 1...

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Abstract

The invention belongs to the technical field of structural health inspection, and provides a structural damage area identification method based on weighted least squares of sub-frequency bands, which divides the input and output responses of structures under earthquake action into several frequency intervals within a certain frequency range, and uses The Chebyshev bandpass filter obtains the time history signals of different frequency bands, and performs least squares parameter identification on the signals of each frequency band, and then uses the energy of each frequency band as the weight, and uses the ordinary Kriging method to obtain the weight , to carry out the weighted calculation of the modal parameters. The beneficial effects of the present invention are: (1) frequency division weighting improves the accuracy; (2) the damage area is identified through the change of the mode shape, which is more intuitive and accurate.

Description

technical field [0001] The invention belongs to the technical field of structural health inspection, and in particular relates to a method for identifying structural mode parameters and damage regions. Background technique [0002] Environmental loads such as strong winds, earthquakes, and various human factors such as fires and explosions will cause varying degrees of damage to buildings, and the performance of the structure will also change accordingly. Changes in the mechanical properties of the structure will cause dynamic fingerprints such as its own frequency and damping. Variety. Therefore, it is an important prerequisite for structural health monitoring and damage identification to be able to identify the modal parameters of the structure in a timely and accurate manner. [0003] In actual engineering, it is more practical to directly use the modal information before and after damage for damage identification. Although the existing damage identification methods can...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00
CPCG06F2218/02G06F2218/12
Inventor 刘博徐强陈健云李静
Owner DALIAN UNIV OF TECH
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