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Keywords: natural frequency
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Proceedings Papers

Paper presented at the SNAME 23rd Offshore Symposium, February 14, 2018
Paper Number: SNAME-TOS-2018-007
... 60m to 140m. The corresponding depth of SBT changes from 84.3m to 164.3m. Other parameters are kept unchanged. The 6 DOFs motion natural frequencies of the LM-FPSO are derived by modal analysis in Orcaflex for the fully coupled model. All natural frequencies are normalized by the natural frequencies...
Proceedings Papers

Paper presented at the SNAME 23rd Offshore Symposium, February 14, 2018
Paper Number: SNAME-TOS-2018-024
... are summarized in Table 1 and Table 2. The Y-Wind platform is assumed to be installed in the US offshore at a water depth of 200 m and designed to produce a power of 5MW for a service life of 25 years. Details of the Y-Wind can be found in Boo et al. (2017a, 2017 b). The natural frequencies of 6 DOF motions were...
Proceedings Papers

Paper presented at the SNAME 22nd Offshore Symposium, February 2, 2017
Paper Number: SNAME-TOS-2017-007
... at the swell period, which exceeds the peak at the natural frequency. Our previous experiments in uni-directional long period waves identified an instability in passive weathervaning systems of FPSOs, wherein for wavelengths from 0.6 < λ/L < 2 (L – ship length) the model drifted to a large angle of 45...
Proceedings Papers

Paper presented at the SNAME 21st Offshore Symposium, February 16, 2016
Paper Number: SNAME-TOS-2016-012
... Multiphase flow-induced dynamic loads in rigid tie-in spool are mainly generated by fluid density variation, slugging, and direction change at bends. When the frequencies of the induced dynamic loads are close to the natural frequencies of the rigid tie-in spool, resonance will occur. This may...
Proceedings Papers

Paper presented at the SNAME 20th Offshore Symposium, February 17, 2015
Paper Number: SNAME-TOS-2015-017
... mm sufficient to capture wave effects around the submerged bracing joints. Hull damping was estimated as a function of the mass, natural frequency and critical damping coefficient in each mode (determined from free decay tests), with a drag coefficient of 0.9 applied to the tendons only...
Proceedings Papers

Paper presented at the SNAME 19th Offshore Symposium, February 6, 2014
Paper Number: SNAME-TOS-2014-013
.... The question remaining was the fluttering related to fairing-pipe friction or was it related to the reduction moment of inertia which changed the rotational natural frequency. To better understand the problem a simple analytical model of the system was developed. The flutter of fairings can be studied...
Proceedings Papers

Paper presented at the SNAME 18th Offshore Symposium, February 7, 2013
Paper Number: SNAME-TOS-2013-004
... wind energy proceedings support structure naval architect dynamic analysis jacket support structure th offshore symposium us government offshore projects planning and execution natural frequency jacket structure sustainability platform design Proceedings of the 18th Offshore Symposium...
Proceedings Papers

Paper presented at the SNAME 16th Offshore Symposium, February 9, 2010
Paper Number: SNAME-TOS-2010-008
... process. To predict and possibly mitigate the resonance of the system, it is crucial to accurately estimate the natural frequency from the total added-mass of the system. The objective of this study is to determine the total added-mass coefficient of a suction pile through model tests. KEY WORDS: Added...

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