Structural Health Monitoring of Offshore Platforms in the Persian Gulf Using “SIJacket” Computer Program for Ambient Vibration Tests

Structural Health Monitoring of Offshore Platforms in the Persian Gulf Using "SIJacket" Computer Program for Ambient Vibration Tests

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Part of #Structural Health Monitoring of Offshore Platforms in the Persian Gulf Using “SIJacket” Computer Program for Ambient Vibration Tests# :

Publishing year : 2002

Conference : The 5th International Conference on Coastal, Ports and Marine Structures

Number of pages : 4

Abstract: There were selected platforms in the Persian Gulf and their ambient vibrations were recoded in several intervals. The platforms were installed in a deep section of the Persian Gulf, with 67 meters of water depth. The production platform was a four-legged steel jacket structure with six horizontal bracing in height and grouted dents. The penetration of the piles was equal to 60 meters. The jacket had a boat-landing, tow oil risers which were connected to the legs by clamps and a H2S riser from -24 meter to the cellar deck. The platforms had a lifetime of 30 years at the time of vibration recording (Fig. 1).
A procedure was developed to implement the Welch method for estimating the power spectral density function (PSD) using non-stationary algorithms. The emphasis was to illustrate the non-stationary signal processing for offshore structures and to implement a new method for higher resolution of the PSD.