電氣工程專業(yè)英語-資料下載頁
2025-07-26 15:00本頁面
【正文】 control systems are included among the functions of the human body.在人體的各種功能中包含許多復雜的控制系統(tǒng)。A block diagram consists of a block representing each ponent in a control system connected by lines that represent the signal paths.方框圖由表示控制系統(tǒng)每個元件的模塊組成，這些元件由代表信號通路的信號線連接。The process block represents everything performed in and by the equipment in which a variable is controlled.過程模塊代表被控變量所在裝置完成的每件任務和通過裝置執(zhí)行的每件任務。Finally ,the change in the manipulated variable drives the controlled variable back toward the set point .最后，控制變量的改變帶動被控變量向設定值方向變化 。The mean gives us an estimate of the expected value of an observation ,but it gives no idea of the dispersion or variability of the observation.平均值給出了對觀測數(shù)據(jù)期望值的估計，但不能指出觀測數(shù)據(jù)的偏移和變化。Operating characteristics include details about the measurement by ,and operation of effects on the measuring instrument.運行特性詳述了測量儀器的測量及測量儀器 所受影響的作用。Resolution ，dead band, and sensitivity are different characteristics that relate in different ways to an increment of measurement.分辨率、死區(qū) 和靈敏度以不同的方法描述了測量增量不同的特性。Repeatability and reproducibility deal in slightly different ways with the degree of closeness among repeated measurements of the same value of the measured variable .重復性和再現(xiàn)性以大同小異的方式論述被測變量在同一個值的重復測量中的接近程度 。A normally open switch will close the circuit path between the two terminals when the switch is actuated and will open the circuit path when the switch is deactuated.當驅動開關時，常開開關閉合兩端子之間的電路通道；當撤除驅動后，開關斷開電路通道。When an operator actuates a maintainedaction switch,the contacts remain in the new position after the operator releases the actuator.操作值驅動一個持續(xù)動作的開關，當撤除驅動后，觸點仍然維持在新的位置。The relay is actuated by pleting the circuit branch that contains the relay coil.通過接通繼電器線圈所在的分支電路激勵繼電器。The small contact is called a holding contact because it holds coil 1M in the energized condition after the operator the operator releases the START button.稱小的觸點為自鎖觸點，因為在操作者釋放開始按鈕后，這個觸點能將線圈M自鎖在通電狀態(tài)。The triac was developed as a means of providing improved controls for AC power.雙向可控硅已作為對交流電網(wǎng)進行改進控制的工具。Latched on by a control signal but must be turned off by the power circuit.由控制信號控制器件導通，但必須通過電力電路的作用才能使其關斷。Once the device begins to conduct ,it is latched on and the gate current can be removed.一旦器件開始導通，它就自鎖（門極失去作用），可以移去門極電流 。latched on by a control signal must be turned off by the power circuit.由控制信號控制器件導通，但必須通過電力電路的作用才能使其關斷。once the device begins to conduct ,it is latched on and the gate current can be removed.一旦器件開始導通，它就自鎖（門極失去作用），可以移去門極電流。Because of the large ripple in ud and id ,this circuit is of little practical significance .因為ud和id有很大的脈動，所以這種電路幾乎沒有實際意義。Because of the large ripple in ud and id ,this circuit is of little practical significance .因為ud和id有很大的脈動，所以這種電路幾乎沒有實際意義。23 Overvoltage may stress insulation beyond the breakdown value.過電壓可能會將高于擊穿值的電壓加到絕緣體兩端。 Based on information from instrument transformers ,a dicision is made and delayed to the trip coil of the breaker,which actually opens the power circuithence the name relay.從儀器變壓器 得到信息后，做出決策并將其傳遞給斷路器的分閘線圈，分閘線圈切斷電力網(wǎng)繼電器由此得名。
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