FDB meaning in Space Science ?

Answer:

What is Fluid Dynamic Bearing mean?

Fluid bearings are bearings in which the load is supported by a thin layer of rapidly moving pressurized liquid or gas between the bearing surfaces. Since there is no contact between the moving parts, there is no sliding friction, allowing fluid bearings to have lower friction, wear and vibration than many other types of bearings. Thus, it is possible for some fluid bearings to have near-zero wear if operated correctly.

They can be broadly classified into two types: fluid dynamic bearings (also known as hydrodynamic bearings) and hydrostatic bearings. Hydrostatic bearings are externally pressurized fluid bearings, where the fluid is usually oil, water or air, and the pressurization is done by a pump. Hydrodynamic bearings rely on the high speed of the journal (the part of the shaft resting on the fluid) to pressurize the fluid in a wedge between the faces. Fluid bearings are frequently used in high load, high speed or high precision applications where ordinary ball bearings would have short life or cause high noise and vibration. They are also used increasingly to reduce cost. For example, hard disk drive motor fluid bearings are both quieter and cheaper than the ball bearings they replace. Applications are very versatile and may even be used in complex geometries such as leadscrews.

The fluid bearing may have been invented by French civil engineer L. D. Girard, who in 1852 proposed a system of railway propulsion incorporating water-fed hydraulic bearings.

reference

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Forwarding Data Base	Computing
Free Data Base	Computing
Fully Data Base	Computing
Font Data Base	Computing
Fat Data Block	Computing
Form Double Constant Byte	Computing
Financial Data Base	Computing
File Descriptor Block	Computing
Fighter Dive Bomber	General
Font Definition Block	General
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Fluid Dynamic Bearings	General
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Flow Design Bureau	Governmental
FARIDABAD	Indian Railway Station
Fire Down Below	Military and Defence
Functional Description of The Battlefield	Military and Defence
Food and Drugs Board	Regional
Fahrenheit Dry Bulb	Space Science
Fluid Dynamic Bearing	Space Science