THEORETICAL AND EXPERIMENTAL INVESTIGATION OF THE LOW FREQUENCY MOTIONS OF A SINGLE ANCHOR LEG MOORED BUOY AND TANKER

Two methods are described for simulating wave drift force time histories, both of which offer significant speed advantages. The first method is based upon a variant of the Newman approximation. It enables the expression for the drift force time history to be re-arranged into a form which can be evaluated more efficiently. The second method is suitable for microcomputer based initial design studies. It does not attempt to reproduce the entire drift force spectrum. It produces a time history which has the correct probability distribution, and low frequency limit to the spectrum. The results of a series of experiments on a tanker moored to a SALM buoy are compared with a simulation based upon the first of these methods. Good agreement was obtained in most cases. It was found that the added damping due to waves becomes important when there is no current. A further series of model tests is described which investigated the additional damping due to waves. The results are compared with a simplified theoretical prediction, based upon the mean drift force transfer function.

• Supplemental Notes:
  • Proceedings of a Workshop on Floating Structures and Offshore Operations, held Wageningen, Netherlands, 19-20 Nov. 1987, p. 109 [16 pp., 9 ref., 10 fig.]
• Authors:
  • Brendling, W J
  • WILSON, D
• Publication Date: 1987

Language

• English

Subject/Index Terms

• TRT Terms: Damping (Physics); Single point moorings
• Subject Areas: Marine Transportation; Terminals and Facilities;

Filing Info

• Accession Number: 00693673
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM