外文翻譯---控制系統(tǒng)的介紹-全文預覽
【正文】 istics. illustrates an automatic tanklevel control version of the system shown in . It can maintain the desired tank level h within quite accurate tolerances even through the output flow rate through value V1 is varied. If the tank level is not correct, an error voltage is developed. This is amplified and applied to a motor drive that adjusts value V2 in order to restore the desired tank level by adjusting the inlet flow rate. A block diagram analogous to this system is shown in . Because feedback parison is present, the term closedloop is used to describe the system’s operation. Automatic tanklevel control system Block diagram of closedloop system 5 An automatic speedcontrol version of a filedcontrolled dc motor, which was shown in , is illustrated in . This feedback system has the capability of maintaining the output speed relatively constant even though disturbing torques may occur. A tachometer, which function as a transducer that transform speed to control system. Should the output speed differ from the desired speed, the difference amplifier develops an error signal, which adjusts the filed current of the motor in order to restore the desired output speed. Feedback control system used to control position, velocity, and acceleration are very mon in industrial and military application. They have been given the special name of servomechanisms. With all their many advantages, feedback systems have a very serious disadvantage, because the closedloop system may inadvertently act as an oscillator. Through proper design, however, all the advantage of feedback can be utilized without having an unstable system.
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