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National Instruments Corporation
2-1
Xmath Interactive Control Design Module
2
Introduction to SISO Design
Xmath provides a structure for system representation called a
system
object
. This object includes system parameters in a data structure designed
to reflect the way these systems are analyzed mathematically. Operations
on these systems are likewise defined using operators that mirror as closely
as possible the notation control engineers use. This chapter outlines the
types of linear systems the system object represents and then discusses the
implementation of a system within Xmath. The functions used to create a
system object and to extract data from this object are an intrinsic part of the
object class and are also described. Finally, this chapter discusses the
functions
check
,
discretize
, and
makecontinuous
, which use information
stored in the system object to convert systems from one particular
representation to another.
SISO Design Overview
This section provides an overview of what ICDM does and how it works,
restricting the discussion to SISO design. If your interest is MIMO design,
you first should read this chapter and then Chapter 11,
.
Basic SISO Terminology
This section describes the basic terminology and notation for SISO plants
and controllers used in ICDM and this manual. ICDM uses the standard
classical feedback configuration shown in Figure 2-1.
Figure 2-1.
Standard Classical Feedback Configuration Used in ICDM
y
C(s)
r
+
–
P(s)
e
u
