Accession Number:

ADA002708

Title:

A Comparison of Predicted and Experimental Seakeeping Characteristics for Ships With and Without Large Bow Bulbs.

Descriptive Note:

Final rept.,

Corporate Author:

NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD SHIP PERFORMANCE DEPT

Personal Author(s):

• Cox,Geoffrey G.
• Gerzina,David M.

Report Date:

1974-11-01

Pagination or Media Count:

23.0

Abstract:

Comparisons are made between predicted and experimental results for head wave longitudinal ship motions for three ship hulls, one of which possesses a large bow bulb. It is shown that although linearized potential strip theory is adequate for determining motion transfer functions of conventional ship hull forms, overprediction occurs for ships which possess large bow bulbs. Caution is advised in such cases when predicting seakeeping characteristics such as wetness and keel slamming, and it is recommended that the necessary relative bow motion transfer functions be determined experimentally. Further work is required to determine nonlinearities, including viscous effects, associated with large bow bulbs. Examples are given of a current approach to the evaluation of ship wetness characteristics.

Descriptors:

• *SHIPS
• *SEAKEEPING
• *SHIP BOWS
• TRANSFER FUNCTIONS
• SHIP MOTION
• COAST GUARD SHIPS
• DESTROYERS
• SHIP KEELS

Subject Categories:

• Marine Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE