航空術語詞典Dictionary of Aeronautical Terms 下

時間：2011-03-11 23:18來源：藍天飛行翻譯 作者：航空 點擊：次

simple motion. Motion along a straight line, a circular path, or a helix.
simplex communications. A method of communications in which one station transmits while the other receives, then the second station transmits and the first receives. Simplex communications differs from duplex communications, such as telephone, in which both stations can transmit and receive at the same time.
simplex fuel nozzle (gas turbine engine component). A type of fuel nozzle in a gas turbine engine in which all of the fuel is fed to the nozzle through a single fuel manifold.
simulate. To copy something or to make something that represents or acts like something. When a person is learning to fly an airplane, the flight instructor simulates every emergency situation the student is likely to encounter. By experiencing these simulated emergencies under controlled conditions, the student will know how to act if the real emergency ever occurs.
simulator. A device used for training or research that duplicates a piece of complex equipment. Flight simulators duplicate the cockpit of an airplane. All of the controls and instruments are connected to a computer that gives the operator the feel and the indications that would exist under actual flight conditions in a real aircraft.
Emergency and unusual conditions can be simulated and practiced in the simulator far more safely and economically than can be done in the real aircraft.
sine (trigonometric function). The sine of an angle is the ratio of the length of the side of a right triangle opposite the angle, to the length of the hypotenuse (the side opposite the right angle). Sine is abbreviated sin.
sine wave. The waveform of a periodically reversing vibration produced by a rotating machine in which the instantaneous values of the wave are the peak value multiplied by the sine of the angle through which the rotating element has turned.

sine-wave alternating current. Alternating current whose waveform is that produced by a rotary generator. The instantaneous value of sine-wave voltage is found by multiplying its peak value by the sine of the angle through which the rotor of the generator has turned.
For example, when the rotor has turned 30° from the position in which it produces zero voltage, the instantaneous voltage is one-half the peak voltage (the maximum voltage it can produce). The sine of 30° is 0.5, or one-half. When the rotor has turned 45°, the instantaneous voltage is 0.707 time the peak voltage. The sine of 45° is 0.707. When all of the instantaneous values of sine-wave alternating current are plotted, a smooth sine curve results.
single-acting actuator (fluid power system). A type of actuator in a fluid power system that uses fluid under pressure to move it in one direction, but a spring to return it. Hydraulic brakes use single-acting actuators to move the brake shoes out against the rotating drum. Hydraulic pressure moves the shoes out, but a spring pulls them back when the brake pedal is released.

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