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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friction. Opposition to the relative movement between two objects. friction brake. A mechanism used with a rotating wheel or shaft in which friction is used to slow its rotation. friction clutch. A device used to connect a motor to a mechanical load. A plate or cone on the load is driven by a mating device on the motor. A lining made of a material that causes a good deal of friction separates the two surfaces, and a spring forces the surfaces and lining tightly together, allowing the motor to drive the load. The spring force can be released to disconnect the motor from the load. friction error (instrument indications). The error caused by friction in an instrument mechanism. The amount of friction error is found by reading the instrument, vibrating it, and then reading it again. The difference between the two indications is the amount of friction error. friction horsepower (reciprocating engine specification). The amount of horsepower used to turn the crankshaft, pistons, gears and accessories in a reciprocating engine, and to compress the air in the cylinders. The brake horsepower actually delivered to the output shaft of the engine is the total horsepower developed by the engine, less the friction horsepower. friction loss. The loss of mechanical energy in a mechanism caused by friction changing mechanical energy into heat. friction measurement (runway condition). A measurement of the friction characteristics of the runway pavement surface, using continuous self-watering friction measurement equipment in accordance with the specifications, procedures, and schedules contained in AC 150/5320-12, Measurement, Construction, and Maintenance of Skid-Resistance Airport Pavement Surfaces. friction tape. A type of electrical insulating tape that was commonly used in the past, but is being replaced by more effective types of tape. Friction tape is a cloth tape impregnated with a black, sticky, tar-like material. friction welding. A method of joining thermoplastic materials by rubbing the mating surfaces together while applying a large amount of pressure. Heat caused by the friction softens the material, and the pressure fuses the softened edges together. Frise aileron (airplane control). A type of aileron used for lateral control of an airplane. The hinge line of a Frise aileron is set back from the leading edge so a portion of its surface is ahead of the hinge line. When the aileron is raised, to lower the wing on which it is mounted, the portion ahead of the hinge line protrudes below the wing and causes parasite drag. This parasite drag counteracts the induced drag produced on the opposite wing when its aileron is lowered. Frise ailerons minimize adverse yaw. front (meteorology). A surface, interface, or transition zone of discontinuity between two adjacent air |
