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Offshore platform damage positioning method based on residual strain energy and system thereof

An offshore platform and damage location technology, applied in the field of offshore petroleum engineering, can solve the problems of inability to obtain accurate and reliable modal information, reduced applicability of the offshore test environment, waste of human and financial resources, etc., achieving accurate and reliable positioning, reducing difficulty, and saving cost effect

Inactive Publication Date: 2017-01-18
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its inherent defects are also obvious, that is, long-term environmental change and structural response data must be obtained as test data. For offshore platforms, the high test cost and harsh offshore test environment greatly reduce the applicability of this method.
[0008] Therefore, the defect in the prior art is that accurate and reliable modal information cannot be obtained due to the interference of environmental factors in the detection of offshore platform damage. At the same time, the acquisition of modal information requires a large amount of data collection, which wastes manpower and financial resources.

Method used

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  • Offshore platform damage positioning method based on residual strain energy and system thereof
  • Offshore platform damage positioning method based on residual strain energy and system thereof
  • Offshore platform damage positioning method based on residual strain energy and system thereof

Examples

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Embodiment 1

[0081] The first embodiment provides an offshore platform damage location method based on residual strain energy, figure 1 Shows a flowchart of a method for locating damage to an offshore platform based on residual strain energy according to the first embodiment of the present invention; figure 1 The first embodiment shown provides a method for locating damage to an offshore platform based on residual strain energy, including:

[0082] Step S1, in the actual operating environment, perform vibration test on the undamaged and intact offshore platform to obtain the mode matrix of the intact offshore platform;

[0083] Step S2: Perform principal component analysis on the mode matrix of the intact offshore platform to obtain the residual of the intact offshore platform;

[0084] Step S3, in an actual operating environment, perform a vibration test on the damaged offshore platform to obtain a vibration mode matrix of the damaged offshore platform;

[0085] Step S4: Perform principal componen...

Embodiment 2

[0158] figure 2 Shows a schematic diagram of an offshore platform damage location system based on residual strain energy according to the second embodiment of the present invention; figure 2 As shown, the second embodiment provides an offshore platform damage location system 10 based on residual strain energy, including:

[0159] The mode matrix acquisition module 101 of the intact offshore platform is used to perform vibration tests on the undamaged intact offshore platform in the actual operating environment to obtain the intact offshore platform's mode matrix;

[0160] The residual acquisition module 102 of the intact offshore platform is used to perform principal component analysis on the mode matrix of the intact offshore platform to obtain the residual of the intact offshore platform;

[0161] The modal matrix acquisition module 103 of the damaged offshore platform is used to perform vibration tests on the damaged offshore platform in an actual operating environment to obtain ...

Embodiment 3

[0179] The third embodiment is based on the offshore platform damage location method based on the residual strain energy in the first embodiment of the present invention and the offshore platform damage location system based on the residual strain energy in the second embodiment. Simulation effect description.

[0180] Such as image 3 As shown, the offshore platform structure of the simulation study in this embodiment is composed of a column unit 8, a column unit 12, a horizontal plane cross brace unit 49, a horizontal plane diagonal brace unit 65, and a side wall diagonal brace 58 unit, and a total of 76 units. Use MATLAB software to compile the finite element program, establish the finite element model through the computer, as the benchmark finite element model of the intact offshore platform. Then, under different operating environments, different damage conditions are simulated, and the simulated measured mode shapes are obtained. This example simulates five damage conditio...

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Abstract

The invention provides an offshore platform damage positioning method based on residual strain energy and a system thereof. The method is characterized by in an actual work environment, carrying out vibration testing on a perfect offshore platform and a damaged offshore platform so as to acquire a vibration mode matrix of the perfect offshore platform and a vibration mode matrix of the damaged offshore platform; carrying out principal component analysis on the vibration mode matrix of the perfect offshore platform and the vibration mode matrix of the damaged offshore platform so as to acquire a vibration mode residual of the perfect offshore platform and a vibration mode residual of the damaged offshore platform; then constructing a damaged positioning index; and determining a damaged position of an offshore platform. By using the offshore platform damage positioning method based on the residual strain energy and the system thereof, a modal vibration mode of a structure is taken as source data; and through using the vibration mode residual acquired through a principal component analysis method, a residual strain energy index is constructed and then the damaged position of the offshore platform is determined. A few groups of vibration mode data is used to eliminate an interference of an environment factor and damage positioning is accurately completed. Time and financial resources are saved.

Description

Technical field [0001] The invention relates to the field of offshore petroleum engineering, in particular to a method for locating damage to an offshore platform under the interference condition of environmental factors. Background technique [0002] Offshore platforms are basic facilities for the development of offshore oil and gas resources. Due to their large size, complex structure, and long-term operation in harsh marine environments, they are prone to damage and destruction. Therefore, it is extremely important to carry out damage detection on offshore platforms. [0003] Currently, damage detection methods commonly used in the field of marine engineering can be divided into two categories: local detection and overall dynamic detection. Among them, local detection methods (including visual inspection, magnetic particle inspection, radiographic inspection, acoustic emission, etc.) are relatively mature, but it is difficult to reflect the overall structure Information, detect...

Claims

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Application Information

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IPC IPC(8): G01M7/02
CPCG01M7/00
Inventor 王树青徐明强方辉夏志鹏
Owner OCEAN UNIV OF CHINA
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