航空術(shù)語(yǔ)詞典Dictionary of Aeronautical Terms 下

時(shí)間：2011-03-11 23:18來(lái)源：藍(lán)天飛行翻譯 作者：航空 點(diǎn)擊：次

quasi-stationary front (meteorology). A front which moves at a speed of less than five knots.
quenching (metal heat treatment). A process in the heat treatment of metal. The metal is heated to a specified temperature and then removed from the furnace and submerged in oil, brine, or water. The effect of quenching is different for different types of metal. Steel is hardened by quenching, and copper is softened by quenching.
quick-break fuse. A tubular fuse, used to protect a circuit containing an inductive load. If enough current flows to melt the fuse link, a spring pulls the melted ends apart by a distance great enough to prevent an arc from forming.
quick-break switch. An electrical switch with its contacts mounted on a spring. The contacts snap open quickly, even when the switch control is moved slowly. Quick-break switches are used to control circuits containing inductive loads. If the switch contacts were opened slowly, the inductance in the circuit would keep current flowing across the contacts as they separate. This would form an arc and damage the contacts.
quick-change gearbox (machine tool). A gearbox containing a cluster of gears, mounted on a machine tool such as a lathe. These gears allow the speed ratio between the drive motor and the work to be changed easily.
quick-disconnect connector (electrical wire component). A type of wire connector used in aircraft electrical systems. The wires terminate inside an insulated plug with pins or sockets that mate with the opposite type of terminals in a similar plug. The two halves of the connector push together and are held tight with a special nut.

quick-disconnect coupling (fluid lines). A fluid line coupling that automatically seals the line when it is disconnected. Hydraulic pumps are normally connected into the hydraulic system with quick-disconnect
couplings. This allows the pump to be removed for maintenance without air getting into the system. External hydraulic power sources can be connected into the system through quick-disconnect couplings.
quicksilver. Another name for mercury. See mercury.
quiescent current. Current flowing in an electronic circuit when there is no signal on the input.
quill shaft (generator coupling). A type of shaft used to couple an intermittent load, such as a generator to an engine. A quill shaft is a long, thin, hardened steel shaft with splines on each end. One end splines into the engine and the other end splines into the generator.
When an electrical load is suddenly applied to the generator, the quill shaft absorbs the load by twisting. This prevents the load being applied to the gear train of the engine as a sudden shock.
quill shaft (torsional vibration damper). A form of torsional vibration damper used between the engine crankshaft and the propeller reduction gears. The quill shaft is a hardened steel shaft with splines on both ends. One end splines into the crankshaft and the other end into the drive gear of the propeller reduction gear system. Torsional vibration is absorbed by the twisting of the quill shaft.

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