Electrohydraulic servovalves have been the most common device used to control the flow to hydraulic actuators in aircraft fly-by-wire flight control systems. Though servovalves offer several advantages, they present a few drawbacks, among which an unpredictably variable offset between hydraulic null and electrical null In flight control systems at least two actuators supplied by two independent power sources and independently controlled are connected to the same flight control surface to provide the necessary redundancy; when the flows to the actuators are simultaneously and directly controlled by two servovalves, an unfavourable combination of servovalves offsets can originate a force-fighting condition with negative effects on the overall system stiffness, resolution and frequency response. This paper presents an optimal equalization control strategy capable of minimizing the force fighting between two redundant electrohydraulic servoactuators.
Equalization techniques for dual redundant electrohydraulic servoactuators for flight control systems
Ausgleichstechniken für doppelt redundante elektrohydraulische Servo-Aktuatoren für Flugregelungssysteme
2008
15 Seiten, 13 Bilder, 1 Tabelle, 7 Quellen
Conference paper
English
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