Chapter 7
Feedback Controllers
Figure 7.1 Schematic diagram for a stirred-tank blending
system.
1
2
Chapter 7
Basic Control Modes
Chapter 7
Next we consider the three basic control modes starting with the
simplest mode, proportional control.
Proportional
Problem 4.2
Problem 4.2
280
2
3
4
Ka=400*0.5=200 C/min
5
Problem 4.6
6
Problem 4.6
7
8
Problem 4.6 c
9
Problem 4.17
10
4.17
11
Figure 5.11
12
Figure 4.8
13
Comments: It is underdamped process with nominator terms
(check the response in Simulink)
14
Proble
Frequency Response Analysis
Chapter 13
Sinusoidal Forcing of a First-Order Process
For a first-order transfer function with gain K and time constant ,
the response to a general sinusoidal input, x t A sin t is:
y t
1
KA
2 2
et / cos t sin t
(4-25)
Note
Chapter 10
Dynamic Behavior and Stability of
Closed-Loop Control Systems
In this chapter we consider the dynamic behavior of
processes that are operated using feedback control.
This combination of the process, the feedback controller,
and the instrument
Chapter 11
1e 4s
Controller Tuning: A Motivational Example G s
20s 1
Fig. 11.1. Unit-step disturbance responses for the candidate controllers
(FOPTD Model: K = 1, 4, 20).
1
PID Controller Design, Tuning, and
Troubleshooting
Chapter 11
Performance Criteri
Chapter 2
Mathematical Modeling of
Chemical Processes
Mathematical Model (Eykhoff, 1974)
a representation of the essential aspects of an existing
system (or a system to be constructed) which
represents knowledge of that system in a usable form
Everything
More General Transfer Function Models
Poles and Zeros:
Chapter 5
The dynamic behavior of a transfer function model can be
characterized by the numerical value of its poles and zeros.
General Representation of TF:
There are two equivalent representation
Chapter 1
A Career in Process Control
Provides professional mobility.
There is a
shortage of experienced process control engineers.
Well paid technical profession for chemical
engineers.
1
Chapter 1
Importance of Process Control
Process Control directl
Chapter 4
Dynamic Behavior
In analyzing process dynamic and process control systems, it is
important to know how the process responds to changes in the
process inputs.
A number of standard types of input changes are widely used for
two reasons:
1. They ar
Transfer Functions
Convenient representation of a linear, dynamic model.
Chapter 3
A transfer function (TF) relates one input and one output:
x t
u (t )
X s
U (s)
system
y (t )
Y (s)
The following terminology is used:
u
y
input
output
forcing function