Accession Number:

ADA008349

Title:

Prediction of Ship Motions in Regular and Irregular Head Waves.

Descriptive Note:

Final rept.,

Corporate Author:

NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD SHIP PERFORMANCE DEPT

Personal Author(s):

• Hubble,E. N.
• Hadler,J. B.

Report Date:

1975-04-01

Pagination or Media Count:

31.0

Abstract:

Current techniques for the prediction of ship motions in long-crested head waves are discussed. Addition of a speed term to the theoretical pitch damping coeffieient is correlated with experimental data. The relationship between absolute and relative motion along the ship length is discussed. Practical limits are established for integrating the spectral density functions for irregular-sea responses. Recommendations are made for updating computer program YF17, computing irregular wave responses with either idealized or real sea spectra such as the Station INDIA data.

Descriptors:

• *OCEAN WAVES
• *SHIP MOTION
• PITCH(MOTION)
• COMPUTER PROGRAMMING
• SPECTRAL ENERGY DISTRIBUTION
• SHIP HULLS
• HEAVING

Subject Categories:

• Marine Engineering
• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE