航空术语词典Dictionary of Aeronautical Terms 中

时间：2011-03-11 23:13来源：蓝天飞行翻译 作者：admin 点击：次

foaming (lubrication system malfunction). A condition in a lubrication system in which oil passing through the engine picks up air which causes thousands of tiny bubbles to form. Foaming oil does not lubricate efficiently, neither does it adequately pick up heat. Foam is removed from the lubricating oil by passing the oil through a deaerator system.
foam rubber. A form of rubber filled with millions of tiny air bubbles. These bubbles were beaten into the latex before it was vulcanized.
FOD (foreign object damage). Damage to the components in the gas path of a turbine engine that is caused by ingesting objects that are not part of the engine.
Technicians tools carelessly left in the intake ducts as well as debris from the runways or taxiways can cause FOD when the engine is being run on the ground. In flight, the ingestion of ice and birds can cause FOD.
foehn (meteorology). Warm, dry downslope wind whose warmness and dryness is caused by adiabatic compression upon descent. Foehns are characteristic of mountainous regions. See adiabatic process, Chinook, Santa Ana.
fog (meteorology). An obscuration to visibility caused by water droplets that are small enough to remain suspended in the air. Fog differs from drizzle in that it does not fall to the surface, and it differs from cloud only because it extends all the way down to the surface.
foil. A form of metal rolled out into very thin sheets. Foil is normally thought of as a sheet of metal with a thickness of less than 0.15 millimeter (0.006 inch).
folded fell seam (machine-sewed fabric seam). A type of machine-sewed seam in which the edges of the fabric are folded back and a double row of stitches used to form the seam. The stitches pass through three thicknesses of material.

follow-up signal. A signal in an autopilot system that nulls out the input signal to the servo when the correct amount of control surface deflection has been reached.
footcandle (illumination). The amount of illumination on a surface when all points are one foot from a uniform light source of one candela, the amount of light produced by one international candle.
foot-pound (measurement of torque). The amount of torque produced when one pound of force is applied one foot from the point of rotation.
foot-pound (measurement of work). The basic measure of work in the English gravitational system. One foot-pound is the amount of work done by one pound of force when it causes a movement of one foot in the direction of its application. One foot-pound is equal to 1.355818 joules.
foot-poundal (measurement of work). The basic measure of work in the English absolute system. One foot-poundal is the amount of work done when one poundal of force causes a movement of one foot in the direction of its application. One foot-poundal is equal to 0.0421 joule. The difference between a foot-pound and a foot-poundal is that foot-pounds use a measure of weight, and foot-poundals use a measure of mass.

force. Energy brought to bear on an object that causes or tries to cause it to change its direction or speed of motion.

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