時間：2011-06-14 21:26來源：藍天飛行翻譯 作者：航空 點擊：次
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客趁高度開始于起飛高度。當飛機爬升時，環(huán)境壓力減小，高度越高，壓力越低。飛機內部高度（坐艙高度）也以一個低于飛機的速率爬升。增壓系統(tǒng)提供客艙與外界環(huán)境之間的壓力差。 (4) The airplane altitude above sea level is determined by measuring the pressure of the ambient atmosphere. For example, see figure4-3, at 30,000 feet above sea level the ambient pressure would be 4.36 psi. the cabin altitude can be measured by adding the ambient pressure to the 7.80 psid maintained in side the airplane by the pressurization system: ambient pressure 4.36 psi at 30,000 ft. Pressuree diffeential 7.80psid 12.16psi by referring to the chart depicting ambient pressure versus altitude, if the ambient pressure is 12.16psi, the cabin altitude would be 5150 ft (see sigure 4-3). 飛機高度可通過測量環(huán)境大氣的壓力來測得。例如：圖 4-3，在高于海平面 3萬英尺的環(huán)境壓力為 4.36PSI。客艙高度可通過環(huán)境壓力加 7.8PSID來測得， 7.8PSID由增壓系統(tǒng)保持：環(huán)境壓力： 4.36PSI 30000FT壓力差； 7.8PSID坐艙壓力： 4.36+7.8=12.16PSID參照圖表描述環(huán)境壓力高度曲線，如果環(huán)境壓力是 12.16PSID，客艙高度將是 5150英尺（圖 4-3） (5) the cabin pressure is referred to as “psid” and indicates the differential pressure, in pounds per square inch , between inside and outside of the airplane. There are many systems for measuring pressure and “psi” is only one .airplane systems measure pressure in inches of mercury and millibars; these indications are identical to 14.7psi as a measurement of the pressure exerted by the atmosphere at sea level. 客艙壓力被稱為“ PSID”并用“磅 /英尺”指出壓力差，在飛機內外，有許多系統(tǒng)可測量壓力，“ PSI”只是其中之一。飛機系統(tǒng)用英寸水銀或毫巴來測量壓力；這些指示等同于受到海平面大氣壓力 14.7PSI。 (6) The pressure control systems provide cabin differential pressure by controlling the outflow of air from the faselage. The pressure control system consists of an aft outflow valve, forward outflow valve, pressure controller, control panel, pressure sensing inputs, and monitoring indicators. 壓力控制系統(tǒng)通過控制機外氣流來提供客艙壓力差。壓力控制系統(tǒng)包括一個外流閥、前外流閥、壓力控制器、控制面板、壓力傳感器和監(jiān)視器。 (7) The aft outflow valve allowing cabin air to exhaust overboard to maintain cabin pressure. The forward outflow valve receives a control signal from the aft outflow valve . when the aft outflow valve is closed, the forward outflow valve receives a signal to drive full closed.
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