Accession Number:

ADA110653

Title:

Vibration of Ship Hulls Due to Wave Excitation.

Descriptive Note:

Master's thesis,

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

Report Date:

1979-05-01

Pagination or Media Count:

115.0

Abstract:

This thesis presents a computer program designed to estimate the first seven natural frequencies and their respective modes for ships and to estimate ship response in a Pierson-Moskowitz sea. The program was designed to function on a minimum of input. Hull offsets and deck edge height for each station are the major data required. The program computes the hydrodynamic added mass, the polar moment of inertia J, the second moment of area I, the effective shear stiffness KAG and the ship mass for each station. A Prohl sequence is used to determine hull natural frequencies and mode shape. A wave forcing function is presented which sums buoyancy, added mass and damping factors due to wave passage. The program can be used for all vessels, but program development was based on a single beam model so superstructure effects are not considered. A minimum of 20 stations is required. Author

Subject Categories:

  • Marine Engineering
  • Fluid Mechanics
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE