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.