Method for identifying modal parameter based on model order determination and signal noise elimination

A modal parameter identification and signal technology, which is applied in character and pattern recognition, instruments, computer components, etc., can solve the problems of cumbersome model order determination methods, low calculation efficiency and low recognition accuracy, and achieve the effect of avoiding false modals

Inactive Publication Date: 2011-02-02
OCEAN UNIV OF CHINA
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Problems solved by technology

[0006] In order to solve the problems of the existing time-domain modal parameter identification technology due to the cumbersome model order determination method and the low calculation efficiency and identification accuracy caused by the signal being affected by noise, a method based on model order determination and signal denoising is proposed. Modal parameter identification method

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  • Method for identifying modal parameter based on model order determination and signal noise elimination
  • Method for identifying modal parameter based on model order determination and signal noise elimination
  • Method for identifying modal parameter based on model order determination and signal noise elimination

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Embodiment Construction

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] One, the specific implementation steps of the present invention are as follows:

[0033] A. Determine the model order

[0034] First, store the structural impulse response data actually measured ...

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Abstract

The invention provides a method for identifying a modal parameter based on model order determination and signal noise elimination, which comprises the following steps of: accurately determining the order of a model by singular value decomposition technology, eliminating noise from a measured signal by mathematical low-rank approximation technology, and identifying the modal parameter based on the determined order of the model and the signal from which the noise is eliminated. Compared with the prior art, the method for identifying the modal parameter based on the model order determination and signal noise elimination saves computation time, improves work efficiency and the identification accuracy of the modal parameter, therefore has higher practical application value.

Description

technical field [0001] This technical invention is mainly aimed at the identification of the modal parameters of the structure. Modal parameter identification, that is, identifying the modal parameters of the structure from the input-output data of the measurement system. This invention proposes a method for model order determination and signal denoising based on the measured impulse response data, and a method for modal parameter identification based on the determined model order and the denoised signal. Background technique [0002] With the gradual development of oil exploration to the deep sea, the number of offshore platforms is gradually increasing, and damage is unavoidable during the service of offshore platform structures. In order to ensure the safe service of the offshore platform structure and avoid the occurrence of major vicious accidents, it is necessary to carry out regular / irregular inspection and safety assessment of the offshore platform structure during ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00
Inventor 李华军包兴先王树青刘福顺张敏
Owner OCEAN UNIV OF CHINA
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