Accession Number:

ADA027377

Title:

The Added Mass and Damping Coefficients of and the Excitation Forces on Four Axisymmetric Ocean Platforms,

Descriptive Note:

Corporate Author:

DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD SHIP PERFORMANCE DEPT

Personal Author(s):

• Bai,Kwang June

Report Date:

1976-04-01

Pagination or Media Count:

33.0

Abstract:

This report presents numerical results of the added mass and damping coefficients of vertical axisymmetric bodies on or under the free surface. Also computed are the excitation forces on these bodies due to an incident regular wave system. The numerical scheme employs a localized finite-element method, which is based on the theory of the calculus of variations. The excitation forces and moments on a submerged half-spheroid lying on the bottom are computed and compared with the results obtained by others. The agreement is good. Several specific types of floating vertical axisymmetric platforms are considered for ten different wave lengths, in connection with the design of an ocean-thermal converter platform. The added mass and damping coefficients, as well as the excitations, are presented. It is shown that simple strip theory gives a good approximation of the sway and pitch added mass for a disc platform having a long circular cylinder. Author

Descriptors:

• *FLOATING PLATFORMS
• OCEAN WAVES
• MASS
• EXCITATION
• FINITE ELEMENT ANALYSIS
• DAMPING
• COEFFICIENTS
• AXISYMMETRIC
• OCEANS
• NUMERICAL METHODS AND PROCEDURES

Subject Categories:

• Marine Engineering
• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE