Research on damage detection of jacket structure under wind and wave loads
In order to conduct damage localization and damage quantification of jacket structure,a new damage detection method based on variational mode decomposition(VMD)and Chirplet transform(CT)is introduced.Three kinds of environmental loads,namely regular wave load,irregular wave load and wind load,are set on the jacket structure to simulate the real environment of the jacket.The acceleration response signals of each node of the damaged rod are extracted,and the proposed method is used to analyze the energy changes before and after damage for damage localization.Then,the time-frequency entropy of the damage location is further calculated for damage quantification.The feasibility of the introduced method is verified by setting different operating condi-tions,and the results show that the introduced method can locate and quantify the damage of the jacket under dif-ferent environmental loads.
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