National Instruments 370757C-01 用户手册

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To evaluate the performance achieved by a given controller rapidly, it is 
useful to check four basic maximum singular value plots—for example, the 
transfer matrices from process and sensor noises to the error and actuator 
signals.

SV = perfplots ( Sys, nd, ne, { keywords } )

The 

perfplots( )

 function plots the maximum singular value of the 

four transfer matrices of the system in the following figure.

 

In most applications, the 

perfplots( )

 function is applied to a system of 

the form shown in Figure 3-3, where 

P

 is the plant and 

K

 is a proposed 

controller. 

Figure 3-3.  Typical System with Plant and Controller

Sys

d

n

e

u

Sys

d

n

e

u

y

u

P

K

process
noise

sensor
noise

actuator

error