A vortex-induced vibration (VIV) suppression apparatus comprising: a strake having a cylindrical body portion dimensioned to encircle an underlying tubular, a fin portion extending radially outward from the body portion and helically positioned around the body portion, and a gap formed through the body portion and the fin; and a connecting assembly configured to facilitate attachment of the strake to an underlying tubular.

A vortex-induced vibration (VIV) suppression apparatus including a body having a wall dimensioned to at least partly envelope a tubular member in an interior area of the body; at least one extension member extending from the body; and an anti-fouling member mechanically coupled to at least one of the body or the extension member. A method of manufacturing a vortex-induced vibration (VIV) suppression device including providing a VIV suppression device having a body dimensioned to at least partly envelope a tubular member in an interior area of the body and at least one extension member extending from the body. The method further including attaching an anti-fouling sheet to the VIV suppression device.

A fairing device for the reduction of vortex-induced vibrations or motions and the minimization of drag about a substantially cylindrical element immersed in a fluid medium, comprising; a cylindrical element, a fairing rotatably mounted about the cylindrical element, the fairing comprising a shell with a cylindrical cross-sectional shape with an outer diameter (D) following the outer diameter of the cylindrical element from an upward stagnation point of 0 degrees to at least +/−90 degrees, and which at +/−90 degrees continues as two fin-like portions in an aft direction and defining a chord length (C), further comprising that the fin-like portions are convexly curved aft of +/−90 degrees thus tapering towards each other and defining a tail end opening or gap less than the fairing standoff height.

A vortex induced vibration suppression system for use on a subsea riser system having either a stake or fairing component includes at least one fiber optic sensor mounted on the component. The fiber optic sensor associated with the riser includes at least one sensor for producing a sensor signal. The system may include a plurality of sensors and the plurality of signals produced thereby are combined at a multiplexer for generating a single, composite sensor signal. The signal may be monitored in real time or near real time for observing and monitoring the reaction of the subsea riser to conditions inducing vibration.

Techniques are disclosed herein for minimizing movement of an offshore wind turbine. Using the technologies described, a wind turbine may be mounted on a marine platform that is constructed and deployed to reduce environmental loads (e.g., wind, waves, . . . ) on the platform in both shallow and deep water. In some configurations, a fully restrained platform (FRP) is configured to support a wind turbine. According to some examples, moorings are attached to the FRP and/or the structure of the wind turbine structure to reduce movement in six degrees of freedom.

By mutually interconnected specimens of a suppression element (100) according to the invention, there can be formed a strong and reliable construction of a tube around a tubular element. The suppression element (100) has a first fin structure (141) which is extending helically along a portion (121) of a first longitudinal edge (121, 131, 131 A, 131B), and a second fin structure (142) which is extending helically along a portion (122) of an opposite second longitudinal edge (122, 132, 132 A, 132B). In said tube, first fin structures and second fin structures of the various suppression elements are lying helically in-line relative to one another for effectively reducing vortex induced vibrations. The suppression elements (100, 200, 300, 400) are compactly stackable relative to one another.

The present disclosure relates to a device and a method for swinging power generation and vibration suppression by using arc-shaped wing plates with rough surfaces. The device consists of two parts, namely, a rotary swinging system and a collector system. The rotary swinging system includes a collector riser, steering bearings, nanometer material arc-shaped power generation wing plates, and flexible tail plates. The collector system includes telescopic power generation cylinders, a waterproof electric slip ring, and a waterproof power transmission line. The suppression of energy-consumption-free vortex-induced vibration is realized under the combined action that the nanometer material arc-shaped power generation wing plates divide a flowing space and adjust a flow direction, the nanometer material arc-shaped power generation wing plates drive the flexible tail plates to swing to destroy a tail vortex street, and hemispherical bulges and trumpet-shaped deflector holes disturb a boundary layer around flow.

The present disclosure relates to a device and a method for swinging power generation and vibration suppression by using arc-shaped wing plates with rough surfaces. The device consists of two parts, namely, a rotary swinging system and a collector system. The rotary swinging system includes a collector riser, steering bearings, nanometer material arc-shaped power generation wing plates, and flexible tail plates. The collector system includes telescopic power generation cylinders, a waterproof electric slip ring, and a waterproof power transmission line. The suppression of energy-consumption-free vortex-induced vibration is realized under the combined action that the nanometer material arc-shaped power generation wing plates divide a flowing space and adjust a flow direction, the nanometer material arc-shaped power generation wing plates drive the flexible tail plates to swing to destroy a tail vortex street, and hemispherical bulges and trumpet-shaped deflector holes disturb a boundary layer around flow.

A generally cylindrical element 10 that is adapted for immersion in water is described. The generally cylindrical element 10 has an outer surface 11 that is in contact with the water in use. The outer surface 11 has at least two rows of repeating shapes 20, for example hexagons 20, provided on the surface 11, where each row of repeating shapes 20 is separated from the other or the adjacent row(s) by a groove arrangement 30. Each shape 20 within a row is separated from the, or each, adjacent shape 20 by at least one groove 30. This configuration of the surface 11 reduces Vortex Induced Vibration (VIV) and/or drag that may act upon the generally cylindrical element 10 when it is immersed in a body of water.

Embodiments disclosed herein describe cylindrical structures with indents configured to reduce vortex induced vibrations (VIV). For example, the cylindrical structures may be configured to reduce VIV for risers subject to ocean currents.