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Keywords: vibrations
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Journal Articles
Article Type: Cfd And Viv
J. Offshore Mech. Arct. Eng. August 2012, 134(3): 031802.
Published Online: February 2, 2012
...C. Shi; L. Manuel; M. A. Tognarelli; T. Botros This study is concerned with vortex-induced vibration (VIV) of deepwater marine risers. Riser response measurements from model tests on a densely instrumented long, flexible riser in uniform and sheared currents offer an almost ideal setup for our work...
Journal Articles
Article Type: Polar And Arctic Science And Technology
J. Offshore Mech. Arct. Eng. November 2011, 133(4): 041501.
Published Online: April 11, 2011
... that the primary response of the structure would be in its fundamental mode of vibration. In order to glean a greater physical understanding of the ice-structure interaction phenomena, it was critical that this study set out to develop a multimode forced response for the pier when a moving ice floe makes contact...
Journal Articles
Article Type: Ocean Engineering
J. Offshore Mech. Arct. Eng. November 2011, 133(4): 041102.
Published Online: April 7, 2011
...Raed K. Lubbad; Sveinung Løset; Geir Moe Vortex induced vibrations (VIVs) may cause a large amount of damage to deep water risers. Helical strakes are used as a mitigating measure to suppress these vibrations. The purpose of this paper is to verify the efficiency of round-sectioned helical strakes...
Journal Articles
Article Type: Ocean Engineering
J. Offshore Mech. Arct. Eng. August 2011, 133(3): 031106.
Published Online: March 31, 2011
...Gautam Chaudhury A new model for fluid structure interaction during vortex shedding process and associated vortex induced vibration (VIV) of a cylinder in transverse direction is proposed. The present work is based on restrained inline motion. Nevertheless, the model can be further extended...
Journal Articles
Article Type: Offshore And Structural Mechanics
J. Offshore Mech. Arct. Eng. May 2011, 133(2): 021304.
Published Online: February 23, 2011
...Hongxiang Xue; Jinting Guo; Wenyong Tang; Shengkun Zhang In this study, a simplified empirical model for fatigue analysis of top-tensioned risers due to vortex-induced vibration (VIV) in a nonuniform current is presented. Compared with previous studies on this subject, this model is able to take...
Journal Articles
Article Type: Offshore And Structural Mechanics
J. Offshore Mech. Arct. Eng. August 2010, 132(3): 031302.
Published Online: March 17, 2010
...Per M. Josefsson; Charles Dalton The transverse vibratory response of a long, slender vertical top tension riser, subject to an ocean current, is studied. The problem is treated as a coupled fluid flow/vibration problem, which is solved numerically. The fluid flow part is represented by the 2D...
Journal Articles
Article Type: Ocean Engineering
J. Offshore Mech. Arct. Eng. August 2010, 132(3): 031101.
Published Online: March 17, 2010
...Kevin Huang; Hamn-Ching Chen; Chia-Rong Chen Recently, some riser vortex-induced vibrations (VIVs) experimental data have been made publicly available (oe.mit.edu/VIV/) including a 10 m riser VIV experiment performed by Marintek, Trondheim, Norway, and donated by ExxonMobil URC, Houston, TX, USA...
Journal Articles
Article Type: Materials
J. Offshore Mech. Arct. Eng. May 2010, 132(2): 021401.
Published Online: March 1, 2010
.... The offsetting effects of gravity and buoyancy are included in the analysis. These forces can provide considerable axial loading (as can thermal changes), and hence, stability (buckling) is a major concern. Initial studies are based on the planar problem. A free-vibration analysis is also conducted for small...
Journal Articles
Article Type: Ocean Engineering
J. Offshore Mech. Arct. Eng. February 2010, 132(1): 011101.
Published Online: December 21, 2009
... surface erosion, noise, and structural vibration. For both wind and tidal turbines, the flow field may vary temporally and spatially based on boundary layer variations, random gusts and currents, and interaction with topography/bathymetry. Tidal turbines also need to be adjusted for periodic bidirectional...
Journal Articles
Article Type: Polar And Arctic Engineering
J. Offshore Mech. Arct. Eng. August 2009, 131(3): 031501.
Published Online: May 29, 2009
... approaches involved in life-cycle cost evaluation, such as the global reliability under the extreme ice load, the dynamic reliability, and fatigue life induced by ice vibration, are studied. The proposed life-cycle optimum design formulas are applied to a typical ice-resistant platform in Bohai Bay...
Journal Articles
Article Type: Ocean Engineering
J. Offshore Mech. Arct. Eng. August 2009, 131(3): 031102.
Published Online: May 28, 2009
...K. Raghavan, Ph.D.; Michael M. Bernitsas, Ph.D.; D. E. Maroulis, Graduate Student The concept of extracting energy from ocean/river currents using vortex induced vibration was introduced at the OMAE2006 Conference. The vortex induced vibration aquatic clean energy (VIVACE) converter, implementing...
Journal Articles
Article Type: Ocean Engineering
J. Offshore Mech. Arct. Eng. May 2009, 131(2): 021101.
Published Online: February 26, 2009
... of vortex-induced vibration (VIV) of a drilling riser located at a 1000 m water depth site. Proper orthogonal decomposition (POD), an efficient numerical technique for characterizing the spatial coherence in a random field, is employed here to identify energetic current profiles. The accuracy resulting from...
Journal Articles
Article Type: Polar And Arctic Engineering
J. Offshore Mech. Arct. Eng. February 2009, 131(1): 011501.
Published Online: December 11, 2008
...Guojun Huang; Pengfei Liu A dynamic model for the ice-induced vibration (IIV) of structures is developed in the present study. Ice properties have been taken into account, such as the discrete failure, the dependence of the crushing strength on the ice velocity, and the randomness of ice failure...
Journal Articles
Article Type: Ocean Engineering
J. Offshore Mech. Arct. Eng. February 2009, 131(1): 011102.
Published Online: December 11, 2008
...Michael M. Bernitsas; Y. Ben-Simon; Kamaldev Raghavan; E. M. H. Garcia The vortex induced vibrations for aquatic clean energy (VIVACE) converter is a new concept to generate clean and renewable energy from fluid flows such as those abundant in oceans, rivers, or other water resources...
Journal Articles
Article Type: Safety And Reliability
J. Offshore Mech. Arct. Eng. February 2009, 131(1): 011601.
Published Online: October 15, 2008
...A. K. Banik; T. K. Datta The vortex-induced oscillation of TLP tether is investigated in the vicinity of lock-in condition. The vortex shedding is caused purely due to current, which may vary across the depth of the sea. The vibration of TLP is modeled as a SDOF problem by assuming that the first...
Journal Articles
Article Type: Ocean Engineering
J. Offshore Mech. Arct. Eng. November 2008, 130(4): 041101.
Published Online: September 16, 2008
..., and have a 10 – 20 year life. The vortex induced vibration aquatic clean energy (VIVACE) converter—invented by Bernitsas and Raghavan, patent pending through the University of Michigan—satisfies those criteria. It converts ocean/river current hydrokinetic energy to a usable form of energy...
Journal Articles
Article Type: Research Papers
J. Offshore Mech. Arct. Eng. August 2008, 130(3): 031007.
Published Online: July 16, 2008
..., including frequency domain approaches. A good understanding of the intricate coupling mechanisms is paramount for making appropriate approximations in an efficient method. To this end, a simplified two degree-of-freedom system representing the surge motion of a vessel and the fundamental vibration mode...
Journal Articles
Article Type: Research Papers
J. Offshore Mech. Arct. Eng. February 2008, 130(1): 011009.
Published Online: February 20, 2008
... of the number of modes of vibration is studied, as is the influence of the mass ratio and the value of the damping coefficient. The flow past the riser is represented by a shear flow, ranging from Re = 8000 at the lower end of the riser to Re = 10,000 at the upper end of the riser. The riser vibration...
Journal Articles
Article Type: Research Papers
J. Offshore Mech. Arct. Eng. February 2008, 130(1): 011003.
Published Online: December 4, 2007
...Ioannis K. Chatjigeorgiou The present work treats the bending vibration problem for vertical slender structures assuming clamped connections at the ends. The final goal is the solution of the associated eigenvalue problem for calculating the natural frequencies and the corresponding mode shapes...
Journal Articles
Article Type: Technical Papers
J. Offshore Mech. Arct. Eng. November 2007, 129(4): 279–289.
Published Online: March 18, 2007
...Gaute Storhaug; Erlend Moe; Gabriel Holtsmark Currently, the conventional wave loading is the only effect considered in fatigue assessment of ships. Det Norske Veritas (DNV) has recently confirmed that fatigue damage from wave induced vibrations may be of similar magnitude as from the conventional...