NDLI: Analysis on Low Frequency Heave, Roll and Pitch Motions of a Deepwater Semisubmersible

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Xiao, Longfei Yang, Jianmin Yang, Lijun Lu, Haining
Copyright Year	2009
Abstract	Low frequency heave, roll and pitch motions of a semisubmersible should be evaluated carefully, since the air gap and the drilling operation are affected directly. A drilling semisubmersible in operating and survival conditions is investigated numerically and experimentally. Results of RAOs, power spectrums and statistic values are presented and analyzed. Viscous forces are significant for roll and pitch but negligible for heave. The natural periods of roll and pitch are relatively large and low frequency response exists due to excitations by the second order wave drift force. By comparison with the wave frequency response, the low frequency roll and pitch are dominative in operating condition and the same magnitude in survival condition. For heave motion, the low frequency response doesn’t exist in survival storm with long wave periods and exists obviously in operational storm with short wave periods. The effect of wind spectrum is small for heave but very significant for roll and pitch. The low frequency roll and pitch in wind spectrum are much larger than ones in steady wind. It indicated that the resonant roll and pitch induced by the slowly varying wind drift force are much larger than ones induced by the wave drift force.
Sponsorship	Ocean, Offshore and Arctic Engineering Division
Starting Page	185
Ending Page	190
Page Count	6
File Format	PDF
ISBN	9780791843413
DOI	10.1115/OMAE2009-79215
e-ISBN	9780791838440
Volume Number	Volume 1: Offshore Technology
Conference Proceedings	ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering
Language	English
Publisher Date	2009-05-31
Publisher Place	Honolulu, Hawaii, USA
Access Restriction	Subscribed
Subject Keyword	Drilling Wind Storms Wave drift forces Wave frequency Semi-submersible offshore structures Frequency response Resonance Excitation Waves
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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