Application of System Identification for Modeling the Dynamic Behavior of Axial Flow Compressor Dynamics

Table 2

Simulation results with 1% and 5% noise std.

	Error squared	Correl. coef.	Natural freq.	Natural freq.; error
ARX-nom. 1%	1.5154	0.9338	16.9958	0.0247
Mean 5%	1.5159	0.9311	17.0211	0.1241
ARX-nom. 1%	0.0456	0.0078	0.0126	0.0388
Stand. dev. 5%	0.0428	0.0057	0.0993	0.3552
ARX-opt. 1%	1.4606	0.9337	16.5024	2.9272
Mean 5%	1.4408	0.9383	16.5826	2.4553
ARX-opt. 1%	0.0633	0.0073	0.4595	2.7031
Sta. Dev. 5%	0.0544	0.0058	0.4590	2.3990
ARX-opt 1%	1.4837	0.9321	16.9763	0.1394
Mean 5%	1.4828	0.9317	16.9946	0.0317
ARX-opt 1%	0.0369	0.0086	0.0909	0.3359
Stand. dev. 5%	0.0494	0.0051	0.0561	0.1756
ARMAX- 1%	23.4750	0.9200	17.1773	1.0429
nom. Mean 5%	36.4212	0.7272	15.1183	11.069
ARMAX- 1%	24.6217	0.0721	4.4278	12.1042
nom. Std. 5%	66.8224	0.3197	9.6057	26.5340
ARMAX- 1%	1.4761	0.9359	16.4052	3.4997
opt. Mean 5%	1.4676	0.9364	16.5794	2.4741
ARMAX- 1%	0.0710	0.0070	0.4461	2.6227
opt. Std. 5%	0.0580	0.0054	0.3955	2.1698
ARMAX- 1%	1.5249	0.9343	16.9840	0.0941
opt. Mean 5%	1.4866	0.9317	17.0024	0.0141
ARMAX- 1%	0.0607	0.0054	0.0445	0.1716
opt. Std. 5%	0.0619	0.0045	0.0952	0.3731