Research on Anti-Noise Ability of Offshore Platform Health Monitoring System Based on Strain Mode Structural Damage Identification

Abstract

Strain modal structural damage identification is widely used in offshore platform health monitoring. However, due to the limitation of structural testing technology, the complex marine environment around the offshore platform structure is superimposed, such as wind, wave, tidal current and other dynamic environments. In the actual test, many factors interfere with modal identification and damage detection, which brings a certain amount of errors to the identification of modal parameters of offshore platform structure, Thus, the accuracy of loss identification of offshore platform structure is affected. In this paper, the health monitoring system of offshore platform based on strain mode structural damage identification is studied by analyzing the damage identification effect of strain mode structure under different degrees of environmental noise superimposed by single member damage and multi member damage. The research results show that strain mode damage identification can not only accurately locate members, which has better anti-noise ability, but the anti-noise ability under multi member loss is also lower than that under single damage condition. For single member damage, it has better damage identification effect within 10% noise level, and for multi member damage, it just has better damage identification effect within 8% noise level. The research results of this paper find out the base number of damage identification ability of jacket platform structure based on modal parameters, which is a great significance for using strain modal damage identification method in offshore platform structure health monitoring.