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Keywords: natural frequency
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Proceedings Papers

Paper presented at the Offshore Technology Conference, May 1–4, 2023
Paper Number: OTC-32368-MS
... providing insights to avoid such effects in full-scale applications. united states government upstream oil & gas north america government social responsibility sustainable development extreme 2 frequency extreme 1 control system wind energy natural frequency nacelle acceleration...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 1–4, 2023
Paper Number: OTC-32415-MS
... misalignment are investigated numerically using coupled aero-hydro-servo-elastic model in time domain for both operational and extreme conditions. Statistics of each design parameter are discussed for various design load conditions. A sensitivity study of floating tower natural frequency was also carried out...
Proceedings Papers

Paper presented at the Offshore Technology Conference, April 30–May 3, 2018
Paper Number: OTC-28747-MS
... spatial distribution completely coincides with the natural mode shape of the pipe system. Harmonic analysis is performed to obtain the maximum stress range at each natural frequency of the piping system. From the transfer function and pressure fluctuation spectrum, a stress range spectrum can...
Proceedings Papers

Paper presented at the Offshore Technology Conference, April 30–May 3, 2018
Paper Number: OTC-28710-MS
... and accelerometers, have been analyzed to determine the first axial riser natural frequency and associated damping ratio using robust identification methods. Damping ratio values are presented for each data set. This effort has found a fairly consistent level of damping across the range of water depths, vessels...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 1–4, 2017
Paper Number: OTC-27562-MS
... to wave activity at the site. Analysis of low frequency response at the riser natural frequencies indicated that the first few riser modes may have been excited by currents. It was also demonstrated that the low frequency response did not contribute significantly to fatigue life. The wellhead monitoring...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 1–4, 2017
Paper Number: OTC-27808-MS
... displacement tension variation modeling & simulation wellhead fatigue spectra natural frequency riser vessel motion frequency Gryt0yr , G. , Coral , F. , Lindstad , H. B. , and Russo , M. , "Wellhead Fatigue Damage Based on Indirect Measurements," Proc. 34th...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 2–5, 2016
Paper Number: OTC-26991-MS
... force natural frequency wave spectrum amplitude tubular element construction displacement amplitude equation axial dynamic behavior resonance frequency casing and cementing offshore technology conference Presentation of OTC-26991-MS Presentation of OTC-26991-MS Azpiazu...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 4–7, 2015
Paper Number: OTC-25874-MS
... and Serviceability Limit States (FLS and SLS) and generally the SLS requirements result in a conservative design from the ULS point of view. The structural natural frequency is important from the point of view of FLS. It is essential that resonance with the rotational frequency (1P) and the blade passing frequency...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 5–8, 2014
Paper Number: OTC-25448-MS
... in this paper. model test amplitude frequency experimental model step riser configuration upstream oil & gas reynolds number axis offshore technology conference flexible riser coefficient current velocity natural frequency displacement vortex vibration test section Presentation...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 5–8, 2014
Paper Number: OTC-25403-MS
... a cabled system or acoustic modem to transmit data to the surface. In addition, the significance of regional submerged currents for wellhead stress and fatigue is highlighted, as well as considerations for vibration mitigation. wellhead stress flagpole frequency prediction natural frequency bop...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 6–9, 2013
Paper Number: OTC-23958-MS
... 23958 motion characteristic offshore technology conference field development natural frequency configuration upstream oil & gas natural period riser pontoon subsea system production riser frequency flexible dry tree semisubmersible drilling first-order motion application flexibility...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 6–9, 2013
Paper Number: OTC-24240-MS
... represent the actual dynamic properties of each of the turbine systems at the sites. mode shape frequency otc 24240 monopile upstream oil & gas water depth criterion platform design foundation natural frequency elevation accelerometer calibration offshore technology conference...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 6–9, 2013
Paper Number: OTC-24140-MS
... renewable energy module wind energy jst constraint diameter transition piece optimization problem support structure substructure natural frequency offshore wind turbine outer diameter thickness batter artificial intelligence stiffness loading configuration turbine wall thickness hub...
Proceedings Papers

Paper presented at the Offshore Technology Conference, April 30–May 3, 2012
Paper Number: OTC-23048-MS
... vibrationsolutions are derived and solved using simple (e.g., MATLAB) programming. axial vibration vibration axial stress otc 23048 artificial intelligence viv unstable zone instability cross-flow viv amplitude fatigue analysis natural frequency ttr stability diagram tension fluctuation...
Proceedings Papers

Paper presented at the Offshore Technology Conference, April 30–May 3, 2012
Paper Number: OTC-23360-MS
... Abstract Natural frequency monitoring of offshore platforms is a valuable tool forstructural integrity management. Online structural integrity monitoring assumeseven greater significance when platforms are highly susceptible to damage dueto environmental wave loading and fatigue processes...
Proceedings Papers

Paper presented at the Offshore Technology Conference, April 30–May 3, 2012
Paper Number: OTC-23058-MS
... of cycle dependent soil stiffnesschange. From the series of tests conducted it was observed that the FMF of a suctioncaisson founded OWT has the potential to change under cyclic loading. Initiallyan increase in the natural frequency was observed. As other dynamic factors arekept constant this change...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 5–8, 2008
Paper Number: OTC-19161-MS
... developed to virtually eliminate the shedding of vortices. frequency diameter suppressor circumferential length standard deviation viv bare riser otc 19161 displacement vibration natural frequency offshore technology conference drag coefficient model riser riser bobbin reynolds...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 1–4, 2006
Paper Number: OTC-18287-MS
... the system's responses to wave excitation at a range of frequencies, the system's natural frequencies, and the standard deviations of the system's motions in each degree of freedom in various wind and wave environments. This article explores the effects of coupling the wind turbine with the floating platform...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 1–4, 2006
Paper Number: OTC-17787-MS
.... If the frequency of the tones is coincident with the structural natural frequency of the equipment associated with the riser, large amplitude vibrations may be excited. This might lead to fatigue failure. This phenomenon is widespread on many systems. It affected the export riser system of the BP Schiehallion...

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