时间：2011-03-11 23:13来源：蓝天飞行翻译 作者：admin 点击：次
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fluid power. The transmission of force by the movement of a fluid. fluid power systems. Mechanical systems that transfer energy from one location to another by the use of fluids. Hydraulic systems transfer energy by the use of noncompressible fluids, such as oil and water. Pneumatic systems transfer energy by the use of a compressible fluid, such as air. fluorescence. The emission of electromagnetic radiation, especially in the frequency of visible light, stimulated in a substance by the absorption of incident radiation and persisting only so long as the stimulating radiation is continued fluorescent lamp. A tubular electric lamp in which ionized mercury vapor causes a fluorescent coating inside the tube to glow. fluorescent penetrant inspection. A form of nondestructive inspection used to detect surface faults in either ferrous or nonferrous metals or in nonporous, nonmetallic materials. The part to be inspected is thoroughly cleaned and soaked in a penetrating liquid that contains a fluorescent dye. After the part has soaked for a specified period of time, all the penetrant is washed off its surface, and it is dried. The part is then covered with a developer, a chalk-like powder, that pulls the penetrant out of any cracks or faults into which it has seeped. The part is then inspected under an ultraviolet light that causes any penetrant pulled from a fault to show up as a bright spot or line on the surface. fluorescent pigment. Pigment used in a paint which can absorb either visible or nonvisible electromagnetic radiation and release it as energy of the desired wavelength. Fluorescent pigments are used for painting pointers and numbers on instrument dials. When ultraviolet light strikes the fluorescent pigment, the dial and pointers glow with a highly visible light. fluorine. A pale yellow, highly corrosive, poisonous, gaseous, halogen chemical element. Fluorine’s symbol is F, its atomic number is 9, and its atomic weight is 18.998. Fluorine is reactive with most other elements, and it is used extensively in industrial compounds. fluoroscope. An instrument used for nondestructive inspection. A fluorescent screen is used in place of photographic film, to display the shadows which form when X-rays penetrate the structure being inspected. flush patch (aircraft sheet metal repair). A type of sheet metal repair that leaves a perfectly smooth surface. The reinforcement for the patch is mounted inside the structure, and the hole left where the damaged material was removed is filled with a filler plug. All rivets used for the repair are flush rivets. See illustration for filler plug. flush rivet. An MS20426 aircraft solid rivet that has a countersunk head. The hole for the rivet is prepared by either countersinking or dimpling. When the rivet is driven, its head is flush with the surface of the metal. Flush rivets are used to produce an aerodynamically smooth surface. flute. A groove cut into a cylindrical object. A twist drill is a type of tool having cutting edges on its end and flutes cut in the form of a spiral running the length of the drill. Lubricant can be fed to the cutting edge through the flutes, and chips move up through the flutes to keep the hole clean. |
