DOUBLE-FACTOR METHOD FOR THE LINEARISATION OF DRAG FORCE

Existing linearisation methods for drag force have some shortcomings according to the authors' analysis. In this paper a new double-factor method for a modified vectorial Morison Equation was presented. The coefficients are determined by the least square error principal and calculated by numerical methods. According to this method, the correlation matrix and the spectrum matrix of wave current force acting on horizontal cylinders are established. For estimating the accuracy of linearisation methods we adopt the ratio of zero order moment of linearised drag force spectrum with that of original drag force spectrum as the criterion of error evaluation. It is found that linear spectra obtained by the proposed method in this paper are closer to original spectra. So the method presented in this paper is more reasonable.

• Supplemental Notes:
  • Proc. 8th Intnl. Conference Offshore Mechanics and Arctic Engn.(1989) p.39 [5 pp.]
• Authors:
  • Teng
  • B Li
  • Y-c
• Publication Date: 1989

Language

• English

Subject/Index Terms

• TRT Terms: Cylindrical bodies; Drag; Mathematical models
• Uncontrolled Terms: Fluid-structure interaction
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00696544
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM