مقاله انگلیسی رایگان در مورد کنترل فازی تطبیقی مقاوم در برابر افزایش فشار کمپرسور – اسپرینگر 2014

Abstract
Active control can expand operation range of compression systems. However, most of existing active controllers depend on known system characteristics and thus have limited engineering application. Robust control methods are used to alleviate the negative effects of uncertainties, but, with conservative results. In order to overcome the weakness of existing active controllers, a second-order MG surge model was presented using a close-coupled valve as actuator. Then, one active surge controller was designed based on backstepping control, in which, fuzzy system was used to model unknown system characteristics. Simulation results showed that the designed controller stabilized compression system outside the surge line, enlarge compressor’s working range and additionally showed strong robustness against uncertainties such as unmodelled dynamics, flow and pressure disturbances.

Introduction

Compressor is one of essential elements of gas turbine engine. Given the rotational speed, the maximum flow of compressor is defined by one valve of compression system or of engine.With the gradual decrease of flow, pneumatic instability occurred first inside the compressor, which is followed by surge and/or rotating stall. Surge is a kind of unstable flow regime with flow disruption occurring to the whole compression system which is composed of compressor, inlet/outlet pipes, downstream throttling device, etc. Surge is featured as axial oscillation of flow and pressure. Surge and rotating stall limit operation range of compressor reduce the system efficiency and might bring damage to the whole system, therefore should be avoided during compressor’s operation.