EXPERIENCES IN DEVELOPING AND OPERATING INTEGRITY MONITORING SYSTEMS IN THE NORTH SEA

Offshore structures vibrate under the action of the sea, wind and on board machinery. The response is most marked at the natural frequencies of these structures which are dependent on the geometry, stiffness and mass of the structure and are independent of the excitation. Measurements of the responses of three platforms in the North Sea have been made over a period of nine months. Each platform has produced a unique signature which has remained constant within prescribed limits. Failure of any structural member in the platform will produce a change in the signature and changes of greater than 15% have been measured when minor modifications were made to one of the test platforms. This vibration analysis technique for the monitoring of offshore structures as a primary inspection aid is both technically feasible and practically possible.

• Supplemental Notes:
  • Presented at the Eighth Annual Offshore Technology Conference, Houston, Texas, May 3-6, 1976.
• Corporate Authors:

  Offshore Technology Conference

  6200 North Central Expressway
  Dallas, TX  United States  45206
• Authors:
  • Loland, O
  • Dodds, C J
• Conference:
  • Presented at the Eighth Annual Offshore Technology Conference, Houston, Texas, May 3-6, 1976.
• Publication Date: 1976-5

Media Info

• Features: References;
• Pagination: p. 313-320

Subject/Index Terms

• TRT Terms: Offshore structures; Structural analysis; Vibration
• Old TRIS Terms: Structural vibration
• Subject Areas: Bridges and other structures; Design; Marine Transportation;

Filing Info

• Accession Number: 00138214
• Record Type: Publication
• Source Agency: Offshore Technology Conference
• Report/Paper Numbers: V2, OTC 2551 Proceeding
• Files: TRIS
• Created Date: Aug 23 1976 12:00AM