Page 27 - Modern Control Systems

C HAPTE R Introduction to Control
1 Systems

1.1 Introduction 2
1.2 Brief History of Automatic Control 5
1.3 Examples of Control Systems 10
1.4 Engineering Design 17
1.5 Control System Design 18
1.6 Mechatronic Systems 21
1.7 Green Engineering 25
1.8 The Future Evolution of Control Systems 27
1.9 Design Examples 28
1.10 Sequential Design Example: Disk Drive Read System 32
1.11 Summary 34

PREVIEW
In this chapter, we discuss open- and closed-loop feedback control systems. A con-
trol system consists of interconnected components to achieve a desired purpose. We
examine examples of control systems through the course of history. These early sys-
tems incorporated many of the same ideas of feedback that are employed in modern
manufacturing processes, alternative energy, complex hybrid automobiles, and so-
phisticated robots. A design process is presented that encompasses the establish-
ment of goals and variables to be controlled, definition of specifications, system
definition, modeling, and analysis. The iterative nature of design allows us to handle
the design gap effectively while accomplishing necessary trade-offs in complexity,
performance, and cost. Finally, we introduce the Sequential Design Example: Disk
Drive Read System. This example will be considered sequentially in each chapter of
this book. It represents a very important and practical control system design problem
while simultaneously serving as a useful learning tool.

DESIRED OUTCOMES
Upon completion of Chapter 1, students should:
• Possess a basic understanding of control system engineering and be able to offer
some illustrative examples and their relationship to key contemporary issues.
Q Be able to recount a brief history of control systems and their role in society.
• Be capable of discussing the future of controls in the context of their evolution-
ary pathways.
G Recognize the elements of control system design and possess an appreciation of
controls in the context of engineering design.

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