Accession Number : AD0432182


Title :   An Investigation of Midship Bending Moments Experienced in Extreme Regular Waves by Models of a Tanker and a Destroyer


Descriptive Note : Progress rept. no. 2


Corporate Author : STEVENS INST OF TECH HOBOKEN NJ


Personal Author(s) : Dalzell, J F


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/432182.pdf


Report Date : 03 Feb 1964


Pagination or Media Count : 51


Abstract : 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/gamma = 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.


Descriptors :   *SHIP HULLS , CARGO SHIPS , MODEL BASINS , OCEAN WAVES , SHIP MODELS , TANKER SHIPS


Subject Categories : Marine Engineering


Distribution Statement : APPROVED FOR PUBLIC RELEASE