%0 Journal Article %T Damage Detection in Offshore Fixed Platforms Using Concepts of Energy Entropy in Wavelet Packet Transform %J Amirkabir Journal of Civil Engineering %I Amirkabir University of Technology %Z 2588-297X %A Rahami, H. %A Amini Tehrani, H. %A Akhavat, M. %A Ghodrati Amiri, Gh. R. %D 2016 %\ 10/22/2016 %V 48 %N 3 %P 241-248 %! Damage Detection in Offshore Fixed Platforms Using Concepts of Energy Entropy in Wavelet Packet Transform %K Structural health monitoring %K Offshore Platforms %K signal processing %K Wavelet Packet Transform %K Energy Entropy %K Sensitivity analysis %R 10.22060/ceej.2016.597 %X Structural health monitoring is of great importance in order to ensure safe and reliable performanceof structures during the service life. Offshore platforms have been widely used in offshore oil and gasexploitation and are highly susceptible to damage since a major part of these structures is under waterexposed to corrosive ocean environments. Utilizing signal processing tools is one of the effective methodsin identifying the structural damages. In this paper, at first a jacket platform model is introduced andvarious damage patterns are applied to the model through members’ stiffness reduction. Then, structuralresponse is recorded under the Gaussian white noise excitation. At this stage, the recorded accelerationresponse is decomposed at different levels via wavelet packet transform and then by using the conceptsof energy entropy and performing a sensitivity analysis, damage sensitive components are selected.Results show that the selected damage sensitive components have good efficiency even in low intensitydamages and also the change rate of of these components is markedly related to the severity of the damage. %U https://ceej.aut.ac.ir/article_597_8fe201af8552ae10d6cac3efb2314000.pdf