时间：2011-03-11 23:13来源：蓝天飞行翻译 作者：admin 点击：次
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The pointer, mounted on the movable coil, is restrained by two calibrated hairsprings. The amount of its rotation is proportional to the strength of the two magnetic fields, and this makes the movement of the pointer proportional to the amount of power being measured. dynamometer (mechanical measuring instrument). A device used to measure the amount of torque being produced by a rotating machine. The rotating machine is loaded with either an electric generator or a fluid pump whose output is measured and converted into units of mechanical power. A dynamometer measures the torque the machine produces at a specific RPM, and this data is converted into brake horsepower. dynamotor (electrical machine). An electrical machine that converts low-voltage DC into high-voltage DC. The dynamotor has two armatures on its single rotating shaft, and these armatures turn inside of two sets of field coils. One set of field coils and one armature is for a low-voltage DC motor, and the other set of field coils and armature are for a high-voltage DC generator. A dynamotor is also called a rotary converter. dyne. A unit of force in the centimeter-gram-second system of units. One dyne is the amount of force needed to cause a mass of one gram to accelerate one centimeter per second, each second it is acted on. One dyne is equal to 2.248 . 10-6 pounds. dysprosium. A soft, silvery, rare-earth metallic chemical element. Dysprosium’s symbol is Dy, its atomic number is 66, and its atomic weight is 162.50. Dysprosium is used in nuclear research. Dzus fastener (aircraft cowling fastener). A patented fastener used to secure aircraft cowling and inspection plates. A slotted stud is forced down over a piece of spring steel wire and is locked in place by turning the stud a quarter of a turn. This forces the wire into a cam-shaped groove in the stud. EADI (electronic attitude director indicator). A colored multifunction display flight instrument that shows pitch and roll attitude indications along with flight director commands, localizer and glide slope indications, selected airspeed, ground speed, automatic flight control system and autothrottle modes, and radio altitude and decision height. An EADI is used in conjunction with an EHSI. See EHSI. E early warning radar (defense radar). Long-range radar that scans the sky in all directions to detect enemy aircraft and/or missiles. Detection and warning occur early enough to allow fighters to intercept and destroy the threat before it reaches its target. earplug (hearing protector). A device made of rubber or some type of soft plastic worn in the ear canal to prevent loud noises damaging the delicate mechanism in the ear. Earplugs or other types of hearing protectors must be worn when working on most jet aircraft flight lines to prevent hearing loss. earth (electrical connection). Earth is the term used in the United Kingdom for the electrical reference called “ground” in the United States. |
