北航自控原理课件1(英文版).ppt

* * Chapter 1:Introduction to Automatic Control 重点掌握: ?控制系统的基本组成 ?基本的控制方式及反馈控制系统的特点 ?控制系统的性能要求 Main contents What is a control system? Why are control systems important? What is an automatic control system? Basic components and types of control system. How to evaluate a control system? The development of control theory. What is a control system? examples Control of Traffic Lights Power Heater Furnace Switch Furnace temperature control system Desired temperature furnace thermometer gas mixer valve air operator Temperature control system Definition of a control system An interconnection of components forming a system configuration that will provide a desired system response. 由相互关联的部件按一定的结构构成的系统，能够提供预期的系统响应。 Why are control systems important? (1)控制系统无处不在. (2)提高产量，降低成本. (3)提高精度、可靠性. (4)能够在许多人不到达的场所发挥作用. furnace thermometer gas mixer valve air Desired temperature operator What is an automatic control system? A control system without people involved is called automatic control system. Definition of automatic control system Temperature control system Gas Mixer Air Valve Motor Amplifier UT Potentiometer UR Amplifier Furnace Thermocouple types and Basic components of control systems. Desired output response (Command input) Actuating device process Output Controller plant Power Heater Furnace Switch 被控对象 Furnace Switch Heater Command input Output Controller Plant Furnace temperature control system Tank Valve 1 Lever Disturbance(valve 2) Valve 1 Valve 2 Tank Water Level control system Temperature control system Gas Mixer Air Valve Motor Amplifier UT Potentiometer UR Amplifier Furnace Thermocouple Valve Mixer Air Amplifier Furnace C Amplifier Thermocouple Motor UR UT Reference input Comparison Controller Plant Output Measurement Feedback signal C 被控对象 Controller Plant R U Block diagram of control systems Types of control systems (1) Open-loop control systems; (2) Closed-loop control systems(feedback control systems). (3) Compound control systems An O