AN INVESTIGATION OF MIDSHIP BENDING MOMENTS EXPERIENCED IN EXTREME REGULAR WAVES BY MODELS OF A TANKER AND A DESTROYER

This report summarizes experimental research to investigate the possibility of a physical upper limit on midship bending moments in tanker and destroyer type ships being reached in regular waves of height significantly less than the theoretical upper limit of stability for progressive waves (h/lambda - 1/7). Each model was tested at various speeds in regular head and following towing tank waves of several different lengths and of a wide range of heights. The results were compared with those obtained previously for a modern cargo vessel. No significant upper limit of bending moment was found. However, the study establishes more firmly the grossly linear dependence of midship bending moment on wave height, even for extreme wave heights which may be encountered in service. These findings strengthened the case for determining design wave bending moments on the basis of statistical analyses of ocean waves and/or resulting bending moments.

• Corporate Authors:

  Stevens Institute of Technology

  Davidson Laboratory, Castle Point Station
  Hoboken, NJ  United States  07030

  Ship Structure Committee

  National Academy of Science, 2101 Constitution Avenue, NW
  Washington, DC  United States  20418
• Authors:
  • Dalzell, J F
• Publication Date: 1964-2-3

Media Info

• Features: References;
• Pagination: 42 p.

Subject/Index Terms

• TRT Terms: Bending moments; Bending stress; Flexural strength; Hulls; Ship motion; Ships; Wave height; Waves
• Identifier Terms: Ship Structure Committee
• Old TRIS Terms: Design waves; Hull bending moments; Regular waves; Ship response
• Subject Areas: Design; Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00331935
• Record Type: Publication
• Source Agency: Ship Structure Committee
• Report/Paper Numbers: SSC-156 Prog Rpt.
• Contract Numbers: NObs-78211
• Files: TRIS
• Created Date: May 21 1981 12:00AM