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PREDICTION OF SHIP MOTIONS IN REGULAR AND IRREGULAR HEAD WAVES

E. Nadine Hubble, J B Hadler

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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.

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What this paper is about

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.

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Available 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.

Key concepts: Head (geology), Ship motions, Term (time), Geology, Geodesy, Motion (physics), Spectral line, Acoustics

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