Damage identification method and device for self-elevating platform

A self-elevating platform and damage identification technology, which is applied to the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, can solve the problems of difficult damage-sensitive high-order modal identification, difficult modal information identification, and damage identification results, etc., to avoid The effects of blind detection, mature technology and convenient operation

Inactive Publication Date: 2015-01-14
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is easy to operate, economical and fast, but it needs to measure the structural modal information in a good state before the detection, and it is relatively easy to identify the modal of a single structure or a small structure. However, for large structures such as jack-up platforms, the modal It is very difficult to identify state information; in addition, this method is difficult to identify high-order modes that are sensitive to damage, and environmental noise has a greater impact on the identification results, which may easily cause wrong damage identification results.
Therefore, this identification method is still in the exploratory stage in the actual engineering application process.

Method used

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  • Damage identification method and device for self-elevating platform
  • Damage identification method and device for self-elevating platform

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Experimental program
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Embodiment

[0094] In September 2013, several tests were carried out using the cylindrical leg jack-up platform model in the Key Laboratory of Offshore Engineering of China National Petroleum Corporation. The total height of the pile legs of this model is 2320mm, and steel pipes of Φ114mm×10mm are used. The deck is a triangular platform with a size of 1900mm×2000mm, and a derrick and guide rails are installed on it. During the experiment, 9 acceleration sensors were arranged from top to bottom on one side of the legs, with a spacing of 200 mm, to test the vibration response of the jack-up platform under sine wave excitation. The measurement and conversion results at 6.0 s are as follows: Table 1 shows. The acceleration signal is analyzed through the method and device proposed by the invention, and the damage position of the self-elevating platform is successfully calibrated.

[0095] Table 1 The measurement and conversion results of Embodiment 1 of the present invention

[0096]

[0...

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Abstract

The invention discloses a damage identification method and device for a self-elevating platform, and belongs to the technical field of ocean engineering structure detection. According to the method, under the same sine wave excitation, a damage position of the self-elevating platform to be detected is qualitatively judged according to the deviating condition of actually measured acceleration curvature curves from acceleration curvature reference curve graphs of all key nodes of the self-elevating platform to be detected; the method is convenient to operate, the technology is mature, and the measurement precision is relatively high. The device is based on the method, can qualitatively and precisely identify the damage to the self-elevating platform and is relatively high in automation degree.

Description

technical field [0001] The invention relates to the technical field of marine engineering structure detection, in particular to a damage identification method and device for a jack-up platform. Background technique [0002] With the continuous development of offshore oil and gas resources, the number of jack-up platforms used as offshore production operations and living infrastructure has doubled in recent years. Compared with land structures, jack-up platforms have served in harsh marine environments for a long time. At the same time, they are continuously affected by sea wind, waves, currents and other loads, coupled with the combined effects of environmental corrosion and material aging, and their resistance attenuation is relatively low. Obviously, the probability of damage is also increasing year by year. Once damage occurs in an accident, it will not only cause major economic losses and casualties, but also may cause serious environmental pollution and social and polit...

Claims

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Application Information

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IPC IPC(8): G01N29/04
Inventor 曹文冉刘振纹徐爽许浩李春罗小桥
Owner BC P INC CHINA NAT PETROLEUM CORP
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