时间：2011-03-11 23:11来源：蓝天飞行翻译 作者：admin 点击：次
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conn. To steer or control the direction of a ship or aircraft. connecting rod (reciprocating engine component). The rigid rod that connects the pistons in a reciprocating engine to the throws of the crankshaft. conservation of energy (physical law). The law of conservation of energy states that energy can neither be created nor destroyed, but it can be changed from one form into another. CONSOL (CONSOLAN). A low-frequency, long-distance navigational aid used principally for transoceanic navigation. console (aircraft controls). The portion of the cockpit of an aircraft in which many of the operating controls are located. The control console is normally in the form of a pedestal that extends out from the instrument panel between the seats for the pilot and copilot. constant (mathematical). A number or symbol that has a fixed value for a given condition. An example of a constant useful in aviation maintenance is the relationship between the circumference of a circle and its diameter. This constant has a value of 3.1416 and is commonly known by the Greek letter pi (π). constantan. A copper-nickel alloy used as the negative lead of a thermocouple for measuring cylinder head temperature in a reciprocating engine. Either iron or copper may be used as the positive lead for the thermocouple. constant-current charge (battery charging). A method of restoring the charge to a storage battery by connecting it across a source of direct current that can be maintained at a constant value by varying the voltage as the state of charge progresses. The ideal charging current is about 7% of the ampere-hour capacity of the battery. constant differential mode (aircraft pressurization). The mode of pressurization in which the cabin pressure is maintained a constant amount higher than the outside air pressure. The maximum differential pressure is determined by the structural strength of the aircraft cabin. constant-displacement pump (fluid pump). A pump that moves a constant volume of fluid with each rotation. Gear pumps, gerotor pumps, vane pumps, and some types of piston pumps are constant-displacement pumps. Some form of pressure regulator or relief valve must be used with a constant-displacement pump when it is driven by the aircraft engine. constant-force spring. A form of helical coil spring wound in such a way that it always produces a constant restorative force, regardless of the amount it is displaced. constant-pressure chart (meteorology). A weather chart showing a constant-pressure surface. It may contain analysis of height, wind, temperature, humidity, and/or other elements. constant-pressure cycle of energy release. The cycle of energy transformation used by a gas turbine engine. See Brayton cycle. constant-speed drive (AC generator drive). See CSD. constant-speed propeller. A type of propeller used on an airplane to hold the engine at a constant RPM as the air load on the propeller changes. A centrifugal governor senses the engine RPM, and if it increases above that for which the governor is set, the pitch of the propeller blades will increase. This increased blade angle increases the air load on the propeller, and the engine slows down. |
