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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spectrometric oil analysis. See SOAP (Spectrometric Oil Analysis Program). speech scrambler (communications device). A security device used with a radio transmitter to make voice transmissions unintelligible to anyone not having the correct descrambling equipment and the correct code for the day. The scrambler circuit modifies the voice signals being transmitted so they no longer resemble the original sound. When the signals are received by the intended receiver, they are passed through a descrambler that changes them back into their original form. speed. The rate of motion. Speed, which is the distance an object travels in a given length of time, is expressed in such terms as miles per hour, kilometers per hour, knots (nautical miles per hour), feet per second, or meters per second. Speed, unlike velocity, does not take into consideration the direction of travel. speed brakes (aircraft control). A type of secondary control on an airplane, a control which does not rotate the aircraft about any of its three axes. Speed brakes produce drag without affecting lift, or causing the aircraft to pitch. The drag they produce allows a highly streamlined airplane to descend at a steep angle without picking up excessive speed. speed of light. The speed at which light travels in a vacuum. The speed of light is 299,792.5 kilometers per second, or 186,282 miles per second. speed of sound. The speed at which the mechanical vibrations of sound travel in an elastic medium. Sound travels in air, under standard atmospheric conditions, at a rate of 760 miles per hour, 340 meters per second, or 1,116 feet per second. The speed of sound is affected by the density of the medium through which it travels. In the air this is determined by the air temperature. speed-rated engine (gas turbine engine specification). A gas turbine engine whose rated thrust is produced at a specified RPM. speed segments (air traffic control). Portions of the arrival route between the transition point and the vertex along the optimum flight path for which speeds and altitudes are specified. There is one set of arrival speed segments adapted from each transition point to each vertex, and each set may contain up to six segments. sphere. A solid with a curved surface, like a ball. All points on the surface of the sphere are the same distance from a point within the sphere called its center. spider (propeller component). The high-strength steel component in an airplane propeller that attaches to the propeller shaft of the engine and supports the propeller blades. The spider and the roots of the blades are enclosed in the high-strength propeller hub. spike (electrical disturbance). A transient condition in an electrical circuit in which a pulse of electrical energy with a high voltage and short duration appears in the circuit. Spikes are produced when an inductive load in the circuit is interrupted, and by induction from an outside source, such as a flash of lightning. Special spike-protection circuits are installed in critical electronic equipment to prevent damage from spikes. |
