航空術(shù)語詞典Dictionary of Aeronautical Terms 中

時(shí)間：2011-03-11 23:13來源：藍(lán)天飛行翻譯 作者：admin 點(diǎn)擊：次

doped-in panel (aircraft fabric repair). A repair made to a fabric-covered aircraft wing in which an entire panel of fabric from the leading edge to the trailing edge, between one or more ribs, is replaced. The new fabric is attached to the old fabric by doping it in place, rather than sewing it in, but it is attached to the structure by rib stitching.
doped-on fabric repair. A repair to a small damaged area in an aircraft fabric covering in which the patch is doped to the old fabric, rather than sewed in place.
dope proofing (aircraft finishing procedure). The treatment of a structure to be covered with fabric to keep the solvents in the dope from softening the protective coating on the structure.
dope-proof paint (aircraft finishing material). A type of finish applied over a varnished surface to be covered with fabric and doped. The dope-proof paint prevents the solvents in the dope from softening the varnish.
dope roping (aircraft finishing problem). A condition of aircraft dope being brushed onto a surface that causes the dope to form a stringy, uneven surface, rather than flowing out smoothly. Dope roping is caused by the dope being too cold when it is brushed on.
doping (semiconductor manufacturing). The process of adding small amounts of certain elements as impurities to a semiconductor element to alter its electrical characteristics.
Doppler effect. The apparent rise in the pitch, or frequency, of a sound as its source approaches the hearer, and the decrease in pitch as the source moves away.
Doppler radar. An electronic system used to detect the speed of a moving vehicle. Speed is measured by computing the change in frequency of an electronic signal bounced back from the vehicle.
This change in frequency is related to the speed the vehicle is moving toward or away from the source of the signal.
dorsal fin (aircraft surface). A fixed vertical fin extending from the top of the fuselage to the leading edge of the vertical fin. Dorsal fins are used to increase the directional stability of an airplane.

double-acting actuator (fluid power actuator). A linear fluid power (hydraulic or pneumatic) actuator that uses fluid to move the piston in both directions.
A single-acting actuator, by contrast, uses fluid to move the piston in one direction and some other type of force, such as a spring, to move it in the opposite direction.
double-acting hand pump. A hand-operated fluid pump that moves fluid during both strokes of the pump handle.
double-backed tape (adhesive tape). A type of adhesive tape with adhesive on both sides.
double-cut file. A file with two series of parallel cutting teeth. These teeth cross each other at an angle.

double-cut saw. A saw with teeth that cut on both the forward and return stroke.
double-entry centrifugal compressor. A form of centrifugal air compressor with vanes on both sides of the rotor. Air is taken into both faces of the rotor and discharged from its periphery.

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