Identification of extended Hammerstein systems for modeling sticky control valves under general types of input signals

摘要: This paper is motivated by modeling the control valve stiction phenomena in feedback loops. An extended Hammerstein system with discretized Preisach model as input nonlinearity proposed to capture hysteretic dynamic behaviors of cascading systems consisting valves followed linear subsystems. iterative method presented identify systems. informative needs have multiple local extreme values order ensure identifiable. However, if only a single hysteresis loop active, then an oscillatory two shown be persistently excited for identification. Hence, identification applicable general types inputs well ones. Two industrial examples are provided demonstrate effectiveness