THE APPLICATION OF THIN SHIP THEORY TO THE MOTION OF A SHIP BEING STEERED ALONG A STRAIGHT COURSE

A monohull sailing along a straight course in calm water, of infinite depth and unbounded in the horizontal plane, and being steered by its rudder oscillating harmonically in time, is linearized, based upon thin ship theory. First-order equations serve as the governing equations to describe the yawing motion of a steered ship. The approximate solution of the first-order equations is found by finding a doublet distribution satisfying the "rigid" free surface. The comparison between the numerical calculation of the approximation and the test data of a 1/96 scale ship model of Mariner class is made, at two different speeds, wherein the Froude numbers are 0.05325 and 0.13350 respectively and in a range of reduced frequency in yawing from 2 to 15. It shows that the solution satisfying the "rigid" free surface gives rise to a good prediction of maneuverability for the lower speed (Froude number, 0.05325). For the higher speed (Froude number, 0.13350), the surface wave effects are significant and cannot be neglected in the theoretical prediction of ship maneuverability.

• Corporate Authors:

  Rosenblatt (M) and Son, Incorporated

  657 Mission Street
  San Francisco, CA  United States  94105
• Authors:
  • Chen, H H
• Publication Date: 1972-7

Media Info

• Features: References;
• Pagination: 132 p.

Subject/Index Terms

• TRT Terms: Force; Maneuverability; Oscillation; Rudders; Steering; Waves
• Uncontrolled Terms: Wave forces
• Old TRIS Terms: Course stability; Rudder oscillation; Steering characteristics
• Subject Areas: Marine Transportation; Terminals and Facilities; Vehicles and Equipment;

Filing Info

• Accession Number: 00035674
• Record Type: Publication
• Source Agency: Rosenblatt (M) and Son, Incorporated
• Files: TRIS
• Created Date: Oct 13 1973 12:00AM