National Instruments 370757C-01 用户手册

Figure 2-6.  Performance Degradation of the SISO Tracking System

This section describes the theoretical background on robustness analysis 
and performance degradation.

This section discusses advanced aspects of computing the stability margin 
and the related scaling algorithms.

(μ) 

The stability margin was first defined by Safonov in [Saf82]. If you let

then you can express the margin at frequency d as

1

( ) ...,l

( )

,

(

)

=

margin

ω

( )

=

α det I MΔ

–

(

) 0

≠

{