Automatic control theory 自动控制原理PPT课件

Chapter 1 Introduction
21 century — information age, cybernetics(control theory), system approach and information theory , three science theory mainstay(supports) in 21 century.
+
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Chapter 1 Introduction
4) A servo (following) control system
Input Tr
servopotentiometer
output Tc
load
Fig. 1.5
* principle……
-
servomechanism
M
+
servo motor
* Operating principle……
* Feedback control……
valve
Gear assembly
+
float
motor - Water pool
M
amplifier Figure 1.1
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Chapter 1 Introduction
Another example of the water-level
servomodulator
* feedback(error)……
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Chapter 1 Introduction
5) A feedback control system model of the family planning
(similar to the social, economic, and political realm(sphere or field))
control is shown in figure 1.2.
float
* Operating
lever
p*rFineecdipblae…ck…
water
control……
entrance
2) A temperature Control system
(shown in Fig.1.3)
container
excess procreate
Desire population
government
+
-
(Family planning committee) Policy or
statutes
population society
census
* principle……
Fig. 1.6
* feedback(error)……
comparator
Actuator
Desired
rotate speed n
e
uk
a
ua
Regulator
Trigger
Rectifier
Reference
input ur
Error controller
u Feedbacksignal f
Techometer
measurement (Sensor) Fig. 1.9
Feedback signal Fig. 1.8
Float measurement (Sensor)
Actual water level Water container Output Process
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Chapter 1 Introduction
For the Fig. 1.4, The DC-Motor control system
3) A DC-Motor control system
+
ur
Uk=k(ur-uf)
e
ua
regulator trigger
Uf (Feedback)
rectifier
* Principle…
Fig. 1.4
* Feedback control(error)…
DC motor
M
load
-
M techometer
Gear assembly
+
float
motor - Water pool
M
amplifier Figure 1.1
resistance comparator
Desired water level
Input
amplifier Error
controller
Motor
Actuator Gearing
Valve
Automatic control theory
A Course ——used for analyzing and designing a automatic control system
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整体 概述
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Chapter 1 Introduction
1.2.2 block diagram of control systems
The block diagram description for a control system : Convenience
x
x3 x1 + + e
-
x2
Signal
xxx
1.1 Automatic control
A machine(or system) work by machine-self, not by manual operation.
1.2 Automatic control systems 1.2.1 examples 1) A water-level control system
Actual
DC rotatespeedn
motor
Output n
Process
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Chapter 1 Introduction
1.2.3 Fundamental structure of control systems
源自文库
(variable)
Components (devices)
Adders (comparison)
e=x1+x3-x2
Fig. 1.7
Example:
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Chapter 1 Introduction
valve
For the Fig.1.1, The water level control system:
Water exit Figure 1.2
+
ur
uf
e
amplifier
thermo meter
* Operating principle… * Feedback
ua=k(ur-uf)
M
Gear assembly
control(error)…
Figure 1.3
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Chapter 1 Introduction