Vol.7, No 1, 2008 pp. 45 - 62
UDC 681.5.037
FREQUENCY METHODS FOR ROBUST ANALYSIS
E. Nikolov
Technical University - Sofia
Abstract. The following paper aims at giving analytical expression
and confirming unequivocally the results achieved through frequency methods
for robust analysis of stability and industrial control systems' performance
in conditions under uncertainty. A numerical example of robust analysis
of a system with internal model is presented. Methods of Nyquist- and Black-Nichols-
analysis and the analisis through sensitivity functions for evaluation
of robust properties of control systems are examined.
Key Words: robust stability, robust performance, frequency methods
for robust analysis.
FREKVENTNE METODE ZA ANALIZU ROBUSNOSTI
Cilj ovog rada je da analitički predstavi i nedvosmisleno potvrdi rezultate
dobijene frekventnim metodama za robusnu analizu stabilnosti i karakteristike
industrijskog sistema upravljanja u uslovima nesigurnosti. Prikazan je
numerički primer analize robusnosti sistema sa unutrašnjim modelom. Ispitivani
su metodi Nyqust-ove i Black-Nichols-ove analize sistema upravljanja i
analiza pomoću funkcije osetljivosti za evaluaciju karakteristike robusnosti
sistema upravljanja.
Ključne reči: robusna stabilnost, karakteristike robusnosti,
frekventne metode za analizu robusnosti
