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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Electromagnetic radiation over a wide band of frequencies can prevent the enemy receiving radio transmissions. This form of ECM is called jamming. economizer system (fuel metering system). The system in a carburetor or fuel injection system that meters additional fuel to the engine when the throttle is wide open. This additional fuel removes some of the heat from the cylinders when the engine is producing maximum power. Economizer systems, also called power-enrichment systems, allow the engine to operate with an economical fuel-air mixture for all conditions except full power. E-core (electric transformer core). The core of a transformer on which the windings, or coils, are mounted. The core is made of thin sheets (laminations) of soft iron or silicon steel cut in the shape of the letter E. The coils are placed over the legs of the core, and the opening is closed with strips of the same material cut in the shape of the letter I. eddy (meteorology). A local irregularity of wind in a larger scale wind flow. Small-scale eddies produce turbulent conditions. eddy current (induced electrical current). Current induced in the core of a transformer or the armature core of a motor or generator by current flowing in the winding. Eddy currents cause a power loss and are minimized by making the core of thin soft-iron laminations insulated from each other by a thin coat of varnish. Eddy currents can also be induced in a conductor by a moving or nonuniform magnetic field. eddy current damping. Decreasing the amplitude of oscillations by the interaction of magnetic fields. In the case of a vertical-card magnetic compass, flux from the oscillating permanent magnet produces eddy currents in a damping disk or cup. The magnetic flux produced by the eddy currents opposes the flux from the permanent magnet and decreases the oscillations. eddy current inspection (nondestructive inspection method). A form of nondestructive inspection used to locate faults in a metal part. Eddy currents are induced into the part being inspected and also into a similar part known to be sound. The presence of a defect is indicated by a difference in the amount of current needed to induce the eddy current in the two parts. eddy current losses (electrical machinery). The loss of electrical power caused by eddy currents induced into the cores of transformers and the armatures of generators and motors. This lost power produces heat. edge distance (sheet metal measurement). The distance from the center of a bolt hole or rivet hole to the edge of the metal sheet. edge-grain wood. Wood that has been sawed from the tree in such a way that the edges of its grain are visible in the wide part of the plank. Edge-grain wood is also called quarter-sawed wood. edge thickness (sheet metal measurement). The thickness of the edge of a sheet of material. EDM (electric-discharge machining). A method of machining complex contours in a piece of metal by |
