时间:2011-03-11 23:18来源:蓝天飞行翻译 作者:航空 点击:次
push-pull rod (aircraft control system component). A stiff rod in an aircraft control system that moves a control surface by either pushing or pulling on it. pushrod (reciprocating engine component). A stiff rod or hollow tube used to open the intake and exhaust valves of a reciprocating engine. One end of the pushrod rides in the cam follower, and the other end fits in a socket on one end of a rocker arm. When the cam follower rides up on the cam lobe, the pushrod transmits this movement to the rocker arm, and the rocker arm pushes the valve off its seat. PVC (polyvinylchloride). A thermoplastic resin used to make transparent tubing for insulating electrical wires. PV diagram (reciprocating engine relationship). A diagram showing the relationship between the volume of a cylinder and the pressure during a cycle of engine operation. pylon (jet aircraft component). The structure which holds an engine nacelle or pod to the wing or fuselage of a jet-propelled aircraft. pyrometer. An instrument used to measure high temperatures. Pyrometers usually begin measuring at temperatures above about 600°C. Pythagorean theorem (mathematics). The statement that the square of the length of the hypotenuse of a right triangle is equal to the square root of the sum of the squares of the lengths of the other two sides. Q Q-band radar. Radar that operates in the frequency band from 36 to 46 gigahertz. At this frequency, the wavelength of the energy is between 0.834 and 0.652 centimeter. quadrant (aircraft controls). The housing in an aircraft cockpit on which the engine control levers are mounted. The top of the quadrant is in the shape of a quarter of a circle, and the control levers stick out radially from the quadrant. |