This paper presents an analytical-experimental study of using magnetostrictive actuators in conjunction with an extension-torsion coupled composite tube to actuate a rotor blade trailing-edge flap to actively control helicopter vibration. Thin-walled beam analysis based on Vlasov theory was used to predict the induced twist and extension in a composite tube with magnetostrictive actuation. To validate the analysis, extension-torsion coupled Kevlar-epoxy tubes of different ply lay-ups were fabricated using an autoclave molding technique. These tubes were first tested under static mechanical loads, and tip twist and axial extension were measured by means of a laser optical system and strain gages, respectively. Good correlation between theory and experiment was achieved. Subsequently, these composite tubes were tested under magnetostrictive actuation. The Kevlar-epoxy tube system generated the maximum twist, 0.19 deg in tension and 0.20 deg in compression. The Kevlar-epoxy system showed good correlation between measured and predicted twist values. Finally, alternate actuator concepts for these tubes, specifically piezoelectric stacks and electrostrictive actuators, were examined, and a piezoelectric stack actuator was found to induce much larger force and twist (approximately 3 times that created by the magnetostrictive actuator/tube system).
Torsional actuation with extension-torsion composite coupling and a magnetostrictive actuator
Torsions-Verstellung eines Rotorblatts mittels eines Verbundstoffrohrs mit gekoppelter Dehnung und Torsion und mittels eines magnetostriktiven Aktors
AIAA Journal ; 33 , 4 ; 723-729
1995
7 Seiten, 19 Bilder, 13 Quellen
Aufsatz (Zeitschrift)
Englisch
Stellantrieb , magnetostriktives Bauelement , Rotor (Drehflügel) , Hubschrauber , Aerodynamik , Schwingungsdämpfung , Drehzahl , harmonische Schwingung , Drehbewegung , Rohr , Schichtstoff , Epoxidharz , Flügelprofil , Dünnwand , Balken , mathematisches Modell , Prognose , Auslegung (Dimension) , statische Last , Vergleichsmessung , Korrelation , piezoelektrisches Bauelement
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