DIRECTIONAL STABILITY AND CONTROL OF SHIPS IN RESTRICTED CHANNELS

The dynamic behavior of ships in various channels is examined to develop a guideline to the design and operation of the ship-waterway system, with an emphasis placed on a large full-form ship. Realistic modeling of ship motions has been achieved on a digital computer utilizing hydrodynamic data which were determined in captive model tests, with inclusion of nonlinear terms. A series of digital simulations and eigenvalue analyses has been made to evaluate ship performance in channels with a wide range of parameter variations in channel width, water depth, and control system (or helmsman) characteristics. Consistent results are obtained from two different computational procedures, digital simulations and eigenvalue analyses. results of directional stability, off-centerline course operation, and squat calculations are applied to indicate the relationship between channel dimensions and acceptable ship size. Ship motions during meeting and passing in a canal also have been examined in digital simulations. The predicted ship trajectory compares favorably with full-scale experience of canal pilots.

• Supplemental Notes:
  • Presented at the Annual Meeting of SNAME, November 11-12 1971.
• Corporate Authors:

  Society of Naval Architects and Marine Engineers

  601 Pavonia Avenue
  Jersey City, NJ  United States  07306-2907
• Authors:
  • Eda, H
• Publication Date: 1971-11

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: 38 p.

Subject/Index Terms

• TRT Terms: Directional stability; Maneuvering; Ship motion
• Old TRIS Terms: Course stability; Restricted water operation; Shallow water maneuvering
• Subject Areas: Marine Transportation; Safety and Human Factors; Vehicles and Equipment;

Filing Info

• Accession Number: 00028629
• Record Type: Publication
• Source Agency: Society of Naval Architects and Marine Engineers
• Report/Paper Numbers: Paper 2
• Files: TRIS
• Created Date: Apr 10 1972 12:00AM