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Method for identifying modal parameters of ocean platform structure

A technology of offshore platform and structural modal, applied in the field of offshore oil engineering

Pending Publication Date: 2019-11-05
OFFSHORE OIL ENG +1
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Problems solved by technology

[0004] The main purpose of the present invention is to overcome the above-mentioned shortcomings existing in the prior art, and provide an improved identification method of the modal parameters of the offshore platform structure, which can automatically extract the real mode of the offshore platform structure from the environmental response signal, It not only eliminates most of the noise points, solves the problem of subjective errors that may be caused by manual screening, and greatly improves the efficiency and accuracy of modal post-processing; moreover, it can also improve the health of the platform based on the modal parameter identification results. condition was assessed, contributing to a more detailed understanding of the health of offshore platform structures

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  • Method for identifying modal parameters of ocean platform structure

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Embodiment Construction

[0069] Such as Figure 1 to Figure 2-4 Shown, the present invention adopts following steps:

[0070] Step 1: Perform directional processing on the input stimulus response data of the offshore platform structure environment;

[0071] In order to extract the environmental excitation response data of the offshore platform structure in the standard direction, it is necessary to project the data measured by the vibration measurement node in the standard direction, that is, to perform directional processing;

[0072] Step 2: Construct the Hankel matrix using the stimulus response data of the structural environment, and perform orthogonal triangular (QR) decomposition on it to obtain the projection matrix, then perform singular value (SVD) decomposition on the projection matrix, and then The state space of the system is solved by using the least square method, that is, its state space representation is a mathematical model that expresses the physical system as a set of input, output...

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Abstract

The invention discloses a method for identifying modal parameters of an ocean platform structure. The method comprises the following steps of 1, carrying out directional processing on input environmental excitation response data of the ocean platform structure; 2, constructing a Hankel matrix by utilizing the structural environment excitation response data, carrying out orthogonal triangular decomposition on the Hankel matrix to obtain a projection matrix, then carrying out singular value decomposition on the projection matrix, and solving a vibration system state space equation by utilizing aleast square method and the like; and finally, extracting structural modal information from the system matrix A and the output matrix C in the state-space equation of the vibration system; 3, performing clustering analysis based on density division on the modal result set by utilizing a density-based clustering algorithm; and 4, obtaining real modal parameters, and analyzing a result of the realmodal parameters. According to the method, the real mode of the ocean platform structure can be automatically extracted from the environmental response signal. Therefore, most of noise points are eliminated. Moreover, the health condition of the platform can be evaluated according to a modal parameter identification result.

Description

technical field [0001] The invention relates to an ocean platform, in particular to a method for identifying structural modal parameters of an ocean platform. It belongs to the field of offshore oil engineering. Background technique [0002] The modal parameter identification of offshore platform structure under environmental excitation is of great significance to the design and safety of platform structure. How to exclude the influence of false modes from the modal result set and maximize the selection of real modes has become a difficult point in the engineering application of this technology. [0003] At present, for the identification of modal parameters, the main method is to use the data-driven random subspace algorithm, and the identified modal result set includes real modal components and false modal components. Generally, the stability diagram method is used to judge the true and false modes in the modal result set. The stability map method works well when dealin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/12G06F17/13G06F17/16G06K9/62
CPCG06F17/12G06F17/13G06F17/16G06F18/2321
Inventor 周雷王巍巍何川陈祥余张传杰卢华颜昌德
Owner OFFSHORE OIL ENG
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