NONLINEAR COUPLING OF PITCH AND ROLL MODES IN SHIP MOTIONS

An analysis is presented for the nonlinear coupling of the pitch (heave) and roll modes of ship motions in regular seas when their frequencies are in the ratio of two to one. When the frequency of encounter (excitation frequency) is near the pitch frequency, the pitch mode is excited if the encountered wave amplitude (excitation amplitude) is small. As the excitation amplitude increases, the amplitude of the pitch mode increases until it reaches a critical small value. As the excitation amplitude increases further, the pitch amplitude does not change from the critical value (i.e., the pitch mode is saturated), and all of the extra energy is transferred to the roll mode. Thus, for large excitation amplitudes, the amplitude of the roll mode is very much larger than that of the pitch mode. When the excitation frequency is near the roll frequency, there is no saturation phenomenon and at close to perfect resonance, there is no steady state response in some cases. The present results indicate that large roll amplitudes are likely in this case also.

• Corporate Authors:

  American Institute of Aeronautics and Astronautics

  1290 Avenue of the Americas
  New York, NY  United States  10019
• Authors:
  • Nayfeh, A H
  • Mook, D T
  • Marshall, L R
• Publication Date: 1973-10

Media Info

• Features: References;
• Pagination: p. 145-152
• Serial:
  • Journal of Hydronautics
  • Volume: 7
  • Issue Number: 4
  • Publisher: American Institute of Aeronautics and Astronautics

Subject/Index Terms

• TRT Terms: Pitch (Acoustics); Rolling; Ship motion; Waves
• Old TRIS Terms: Regular waves; Roll amplitude
• Subject Areas: Design; Marine Transportation;

Filing Info

• Accession Number: 00050018
• Record Type: Publication
• Source Agency: American Institute of Aeronautics and Astronautics
• Contract Numbers: N00014-68-A-0146, UR 109-01-03
• Files: TRIS
• Created Date: Nov 14 1973 12:00AM