Fixed offshore platforms are subject to structural failures from storms, earthquakes, ice ship collisions, and fatigue. Current diver inspection operations can be extremely costly and hazardous industry and governmental agencies have been studying the incorporation of other inspection and monitoring techniques to improve the cost effectiveness of the overall monitoring effort. This paper reports on a study conducted by The Aerospace Corporation for the U.S. Geological Survey on the capability provided by monitoring the vibration induced by the typical ambient environment to infer overall structural health. The basis for the assessment is the inferred frequencies and shapes of the lower modes of vibration. The study included the acquisition of data on an eight-leg steel platform using accelerometers located above sea level. In addition to measurement of horizontal translational accelerations as done previously, vertical and angular accelerations were measured. Initial spectral analyses yield encouraging results and suggest more comprehensive studies.
Ambient vibration monitoring for assessing the structural health of offshore production platforms
Ueberwachung der Umgebungsschwingungen fuer die Bewertung der strukturellen Sicherheit von Offshore Plattformen
ASME-Papers ; 1-7
1978
7 Seiten, 10 Bilder, 11 Quellen
Conference paper
English
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