控制系统简介英文版讲解.pptx

Introduction to Control Systems (控制系统的简介) 01 Introduction and Classification of Control Systems 02 Closed-Loop Control and Open-Loop Control 03 The Analysis of the Ad and Disad CONTENTS Introduction and Classification of Control Systems Definition Automatic control Without people’s direct participation Additional facilities (controllers) Run automatically by rule (照规则) Meaning Labor liberation(解放) of human being Improve production efficiency Drive the development of science and technology Introduction and Classification of Control Systems Classification of Control Systems Control systems (by the flowing direction of signal) Open-loop control systems Closed-loop control systems Compound control systems (ellipsis) [?‘l?ps?s],n:省略 By disturbance（按扰动） By the given（按给定） [‘k?mpa?nd] adj:符合的，混合的 Closed-Loop Control and Open-Loop Control Open-loop control systems Fig.1 controlled by the given Fig.2 controlled by the given Characteristics : Unidirectional transmission (单向传输) The output has no effect on the input in turn actuator [?ktj?e?t?] n:[自] 执行机构 plant [plɑ?nt] n:设备，对象（controlled plants 受控对象） Closed-loop control systems Fig.3 controlled by the given Characteristics : The flowing of signal constitutes the circuit Difference controls difference Accuracy determined by the accuracy of the given and measurement [‘k?nst?tju?t] vt:构成，组成 ?[d?f(?)r(?)ns] n:偏差 Closed-Loop Control and Open-Loop Control The Analysis of the Ad and Disad Open-loop control systems Advantages : Simple construction and ease of maintenance Convenient and cheaper No stability problem Disadvantages : Poor ability of anti-disturbance Repeat recalibration [ri‘k?li’bre??n] n:再校准 Used where no disturbances exist or the needed accuracy is not good . Such as water level control , vending machines. The Analysis of the Ad and Disad Closed-loop control systems Advantages : Self-adjust for disturbances Nice ability to resist disturbances High accuracy D