时间：2011-03-11 23:18来源：蓝天飞行翻译 作者：航空 点击：次
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static test (structural test). A type of test given to such mechanisms as airplane structures. Hydraulic cylinders or sandbags apply forces to simulate loads that could possibly be encountered in flight, and the amount the structure deflects is measured. Some static testing is carried to destruction—the structure is loaded until something breaks. Testing to destruction identifies the weakest point in the structure. static thrust (gas turbine engines). The amount of thrust produced by a gas turbine engine when the engine is not moving through the air. static wick. A device used to bleed an accumulated static electrical charge off an aircraft control surface and discharge it into the air. The wick is made of graphite-impregnated cotton fibers, enclosed in a plastic tube. One end of the wick is electrically connected to the trailing edge of a control surface, and the other end of the fibers are spread out of the end of the tube so the hundreds of fiber ends stick out into the air. As the airplane flies through the air, static electricity builds up on the control surfaces, travels through the static wicks, and discharges into the air from the tips of the cotton fibers. station. A location on an aircraft identified by a number designating its distance in inches from the datum. station pressure (meteorology). The actual barometric (atmospheric) pressure measured at the observing station. stator (electrical machine component). The part of an electric motor or generator that produces the stationary, or nonmoving, electromagnetic field. In a direct-current alternator, such as is used on most light airplanes, the stator windings are the coils of heavy copper wire in which the output current is produced. stator (gas turbine engine component). The stationary portion of an axial-flow compressor in a gas turbine engine. A stage of stator vanes is located between each stage of rotor blades. Stator vanes slow the airflow and increase its pressure. statute mile. A unit of linear measurement in the English system. One statute mile is equal to 5,280 feet, or 1.609 kilometers. stay (structural member). A structural member in a truss that is loaded in tension only. Stays are usually made of steel wire, and their length is adjusted by turnbuckles. STC (Supplemental Type Certificate). An approval issued by the FAA for a modification to a type-certificated airframe, engine, or component. More than one STC can be issued for the same basic alteration, but each holder must prove to the FAA that his alteration meets all of the requirements of the original type certificate. steady-state condition (electrical circuit condition). The condition of an electrical circuit that exists when all of the circuit values are constant. When some circuits are first energized, voltage or current transients cause conditions that are not normal. The steady-state conditions can be measured only after all of these transient conditions have stabilized. steam. Water that has been changed into its vapor state by heating it. Steam is invisible, but the cloud of tiny droplets of water that rises above boiling water is often called steam. |
