THE EFFECT OF HULL SHAPE NON-LINEARITIES ON THE CALCULATION OF HEAVE AND PITCH OF A SHIP

Several theories on the behavior of a ship at sea have been used to derive linearized equations of motion for heave and pitch of a rigid ship body. Mathematical equations are used to determine the physical ship model and wave form. The strip theory for determination of the coefficients of the equation of motion, and how the theory was altered to account for hull shape nonlinearities is discussed and presented mathematically. A stepwise solution of the equation of motions is formulated accepting the position and velocities of the ship as initial conditions, and using equations computes the accelerations, velocities, and displacement of a ship. Experiments with a series 60 Block 80 model in a towing tank are discussed and compared with other experiments. Results indicate that adequate work was done in motion analysis. These results also indicate a better correlation with experiments than with linear theory. It is concluded that results would have been more satisfactory if a more accurate theory had been selected.

• Supplemental Notes:
  • This document is available for review at the Department of Commerce Library, Main Commerce Building, Washington, D.C., under reference number MIT-R-64-6.
• Corporate Authors:

  Massachusetts Institute of Technology

  Department of Naval Architecture and Marine Engineering
  Cambridge, MA  United States  02139
• Authors:
  • Parissis, G G
• Publication Date: 1964-6

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: 153 p.

Subject/Index Terms

• TRT Terms: Hulls; Ship motion; Water waves
• Old TRIS Terms: Hull geometry; Hull response; Hull wave interaction
• Subject Areas: Design; Hydraulics and Hydrology; Marine Transportation;

Filing Info

• Accession Number: 00026907
• Record Type: Publication
• Source Agency: Maritime Administration
• Report/Paper Numbers: 64-6
• Contract Numbers: MA-2710
• Files: TRIS, USDOT
• Created Date: May 11 1973 12:00AM