Stabilization while not under way

Stabilization while not under way

Stabilization while not under way or Stabilization at Rest or "'ZeroSpeed Stabilization'" or "'OnAnchor Stabilization'" refers to the process of augmenting roll reduction for a vessel that is not under way. This process may be implemented through use of equipment systems which are also used for stability enhancement while underway.

Vessels at anchor, at moorings, adrift or keeping station are subjected to roll and pitch generating forces similar to those which affect vessels under way. Different strategies for mitigating the effects of these forces have been adopted.

An important variable systems using "active fins” and which are designed for effectiveness with the vessel under way for system sizing calculations is the lifting force imparted by water movement past fins adjusted to maximum working angle at minimum vessel speed.

When these same systems are used for roll stabilization of stationary vessels, the lift force from vessel motion and water flow across inclined fins is not available. For stationary vessels, the ability to generate lifting force (i.e. roll resisting force) is constrained by powered fin movements, and by the water volume displaced while stroking the fins in one direction at a precise point in time.

Active fin systems can provide incremental add-on stability for vessels at rest, but these systems will usually have larger actuators and fins, and will likely have special power source requirements in comparison to systems designed for stability under way.

The worlds first retractable fin stabiliser with Stabilisation at Rest feature is supplied by Rolls-Royce. The product is the Aquarius 50. The fins can be automatically retracted when not in use.

Quantum Marine Engineering of Florida, Inc, has over 200 commissioned ZeroSpeed and OnAnchor systems; and produces MagLift rotary stabilizers, which utilize the Magnus effect for retractable zero-speed stabilization. The Magnus Effect is what makes golf balls hook and slice, and baseballs curve- a rotating sphere or cylinder generates lift relative to rotation direction and velocity. Quantum's active fin zero-speed stabilizer systems create significant roll reduction at anchor or while drifting.

External links

* [http://www.thrusters.com/products/stabilizers_tracstar.shtm Arcturus Marine - manufacturers of TRACSTar]
* [http://www.naiad.com Naiad Marine] - manufacturers of roll stabilizers, stabilization at anchor systems, interceptors, bow and stern thrusters, integrated hydraulic systems
* [http://www.quantumhydraulic.com Quantum Marine Engineering of Florida, Inc] Yacht stabilizer products including ZeroSpeed and OnAnchor systems, with over 200 commissioned ZeroSpeed active-fin systems.


Wikimedia Foundation. 2010.

Игры ⚽ Поможем решить контрольную работу

Look at other dictionaries:

  • Image stabilization — (IS) is a family of techniques used to reduce blurring associated with the motion of a camera during exposure. Specifically, it compensates for pan and tilt (angular movement, equivalent to yaw and pitch) of a camera or other imaging device. It… …   Wikipedia

  • Ship stability — is an area of Naval Architecture and ship design that deals with how a ship behaves at sea, both in still water and in waves. Considerations are made as to the center of gravity and center of buoyancy of vessels and how they interact. History… …   Wikipedia

  • Emergency Economic Stabilization Act of 2008 — This article is about one division of an enacted statute. For the entire statute, see Public Law 110 343. For the enacted rescue program, see Troubled Asset Relief Program. The Emergency Economic Stabilization Act of 2008 (Division A of Pub.L.… …   Wikipedia

  • Treadmill with Vibration Isolation Stabilization — Astronaut Sunita Suni Williams bungeed to the TVIS treadmill aboard the International Space Station. The Treadmill with Vibration Isolation Stabilization System, commonly abbreviated as TVIS, is a treadmill for use on board the International… …   Wikipedia

  • Russia — /rush euh/, n. 1. Also called Russian Empire. Russian, Rossiya. a former empire in E Europe and N and W Asia: overthrown by the Russian Revolution 1917. Cap.: St. Petersburg (1703 1917). 2. See Union of Soviet Socialist Republics. 3. See Russian… …   Universalium

  • Geoengineering — Not to be confused with Geotechnical engineering. An oceanic phytoplankton bloom in the South Atlantic Ocean, off the coast of Argentina. Encouraging such blooms with iron fertilization could lock up carbon on the seabed. The modern concept of… …   Wikipedia

  • Bank of America — Not to be confused with First Bank of the United States, Second Bank of the United States, or Bank of United States. Bank of America Corporation Type Public Traded as …   Wikipedia

  • Indium — Not to be confused with Iridium. cadmium ← indium → tin Ga ↑ In ↓ Tl …   Wikipedia

  • Economic Affairs — ▪ 2006 Introduction In 2005 rising U.S. deficits, tight monetary policies, and higher oil prices triggered by hurricane damage in the Gulf of Mexico were moderating influences on the world economy and on U.S. stock markets, but some other… …   Universalium

  • international relations — a branch of political science dealing with the relations between nations. [1970 75] * * * Study of the relations of states with each other and with international organizations and certain subnational entities (e.g., bureaucracies and political… …   Universalium

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”