A Structural Damage Monitoring Method for Jacket Offshore Platform
A technology for offshore platform and structural damage, which is applied in the direction of material impedance, can solve the problems of difficult location or quantification of damage, complex relationships, lack of monitoring and diagnosis methods, etc., to improve overall economic benefits, improve accuracy, and reduce potential safety hazards and the effect of running risk
Inactive Publication Date: 2014-10-15
DALIAN UNIV OF TECH
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[0005] The analysis of domestic and foreign research status and patent status shows that: (1) The research on the structural health monitoring of offshore platforms is mainly aimed at the monitoring and evaluation of structural integrity, and there is still a lack of monitoring and diagnosis methods for local damage such as corrosion and cracks; (2) The monitoring and diagnosis methods based on electromechanical impedance Structural health monitoring mainly uses the self-sensing of piezoelectric sensors to detect structural damage, but the relationship between electromechanical coupling impedance and structural mechanical impedance is relatively complicated, and accurate damage location or quantification is still difficult to achieve in engineering
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[0018] The basic principle of the invention is that the occurrence and development of damage lead to changes in structural mechanical impedance, and structural health diagnosis can be realized by monitoring the structural mechanical impedance. Although the mechanical impedance of the structure is difficult to obtain directly by means of experiments, the direct and inverse piezoelectric effect and electromechanical coupling characteristics of the piezoelectric material attached to the base structure can be used to indirectly obtain the mechanical impedance of the structure by observing the electrical impedance of the piezoelectric material. Impedance, ultimately enabling structural health monitoring. At present, the commonly used electromechanical impedance damage monitoring method belongs to the point detection method, that is, the structural damage is detected by measuring the electromechanical coupling impedance of a single piezoelectric sensor, and only the structural self-i...
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The invention relates to the technical field of structural health monitoring and discloses a method for monitoring structural damage of a conduit offshore platform. A piezoelectric sensor network arranged on the conduit offshore platform is utilized, one of two adjacent piezoelectric sensors serves as an active sensor, and the other one of two adjacent piezoelectric sensors serves as a driver. The method comprises the following steps of: performing synchronous frequency sweep excitation on the two piezoelectric sensors; measuring to obtain electromechanical coupling impedance or admittance of the active sensor through an impedance analyzer, and detecting damage conditions between the two piezoelectric sensors according to the change of an impedance signal; and finally, scanning the whole sensor network coverage area to monitor the damage of the key stress part or an easily damaged part of the conduit offshore platform. According to the method, the self-impedance and cross-impedance information is combined, the structural damage detection sensitivity and damage positioning accuracy are improved, and the method has positive significance on reducing the potential safety hazard and operating risk of the offshore platform structure and improving the overall economic benefits of the offshore oilfield development.
Description
technical field [0001] The invention relates to the technical field of structural health monitoring, in particular to a structural damage monitoring method of a jacket offshore platform. Background technique [0002] With the rapid development of my country's offshore oil and gas resources development, the number of offshore platforms used as offshore production and living infrastructure has doubled in recent years. Compared with land structures, offshore platform structures have served in complex and harsh marine environments for a long time, and the interaction between loads and catastrophes has greatly aggravated the danger of safe operation of offshore platform structures. There have been many safety accidents on offshore platforms in history, resulting in It has caused huge economic losses, bad social impact and irreparable environmental pollution. A large number of offshore platform safety accidents show that local damage caused by vibration fatigue, stress corrosion,...
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IPC IPC(8): G01N27/02
Inventor 冯新周晶
Owner DALIAN UNIV OF TECH