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Structure damage area identification method based on frequency band weighted least squares

A technique of weighted least squares and structural damage, which is applied in the recognition of patterns in signals, character and pattern recognition, instruments, etc. It can solve the misjudgment of high-order modes in the mode-curvature method and the number of orders in the flexibility-curvature method without a clear standard. and other problems to achieve high-precision results

Active Publication Date: 2019-08-23
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

Method used

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  • Structure damage area identification method based on frequency band weighted least squares
  • Structure damage area identification method based on frequency band weighted least squares
  • Structure damage area identification method based on frequency band weighted least squares

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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 examination, and provides a structure damage area identification method based on frequency band weighted least squares. An input response and an output response of the structure under the action of an earthquake are divided into a plurality of frequency intervals within a certain frequency range; a Chebyshev band-pass filter is adopted to obtain time-history signals of different frequency bands, least square parameter identification is carried out on the signals of all the frequency bands, then energy of all the frequency bandsis adopted as weights, a common Kriging method is adopted to solve the weights, and weighted calculation is carried out on modal parameters. The method has the beneficial effects that (1) frequency division weighting is carried out, so that the precision is improved; and (2) the damaged area is identified through vibration mode changes, and the identification is more visual 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 Applications(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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