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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EK = (M · V2) / 2 kink (form of metal damage). A sharp bend or twist in a piece of wire, tubing, or sheet metal. Kirchhoff’s current law. One of the basic laws of electrical circuits, stating that the sum of the current flowing away from any point in an electrical circuit is equal to the sum of the current flowing to that point. Kirchhoff’s voltage law. One of the basic laws of electrical circuits stating that the algebraic sum of all of the voltage drops in any closed circuit is equal to zero. Another way to think of this is that the sum of all the voltage drops in a circuit is equal to the sum of the voltage sources in the circuit. kite (form of flying machine). A captive flying machine made of a lightweight framework covered with paper or cloth. The kite is tethered to the ground and is held up by aerodynamic lift produced as air flows over its surface. 14 CFR Part 1: “A framework, covered with paper, cloth, metal, or other material, intended to be flown at the end of a rope or cable, and having as its only support the force of the wind moving past its surfaces.” klystron (electronic component). An electron tube used as an oscillator or amplifier of micro-wave energy. K-monel. An alloy of nickel, copper, and aluminum. K-monel is nonmagnetic, heat-treatable, corrosion resistant, and has high strength. knife-edge. A device having a sharp edge of hardened steel that resembles the edge of a knife. Knife-edges are used as fulcrums in many types of precision balancing instruments. knife switch (electrical component). A type of electrical switch having a movable blade (the knife) for one of the terminals and two contacts that are spring-loaded together for the other terminal. When the blade is between the contacts, the switch is closed, and current flows in the circuit. When the blade is lifted from the contacts, the switch is open, and no current flows. Knife switches are seldom used in aircraft electrical circuits. knock (reciprocating engine operation). A loud rattling noise inside the cylinders of a reciprocating engine caused by shock waves produced by detonating fuel. The fuel-air mixture burning inside a cylinder is supposed to move across the face of the piston with a smooth flame front. But if the wrong type or wrong amount of fuel is used, the fuel-air mixture ahead of the flame front gets so hot it explodes. The explosion, called detonation, causes shock waves and produces a tremendous amount of pressure in the cylinder. The resultant stresses can damage the engine. knot (measure of speed). A measure of speed used in aerial navigation. One knot is equal to one nautical mile per hour. One knot = 1.151 statute miles per hour = 1.688 feet per second = 1.852 kilometers per hour = 0.5144 meters per second knot (wood). A hard, usually round section of a tree branch embedded in a board. The grain of the knot is perpendicular to the grain of the board. Knots decrease the strength of the board and must be avoided where strength is needed. |
