RPA (Rotor a Pales Actives) Franco-German project was launched three years ago to study the possible benefits of implementing active trailing edge flaps on a helicopter main rotor. The main expected effects concern the decrease of BVI noise in descent flight and the improvement of the dynamic behaviour of the rotor throughout the largest possible flight domain. The technological solution adopted to deflect the flap on an 1/3rd scale rotor demonstrator, uses an off-the-shelf elliptic amplified actuator, from Cedrat Recherche Company, driving an innovative patented mechanism. The device has been tested as well on the BRAVoS hover rig to assess the influence of centrifugal loads as in the S3 MA wind-tunnel to evaluate the maximum flap deflections with respect to actuation frequencies and Mach number. Extrapolation to scale 1, which must take into account distinct typical constraints, is not purely homothetic and requires further developments for the actuator which are under way, especially in order to respect the mass specifications.
Experimental assessment and further development of amplified piezo actuators for acitve flap devices
Experimentelle Bewertung und Weiterentwicklung von verstärkten Piezoaktoren für aktive Landeklappengeräte
2002
4 Seiten, 12 Bilder, 3 Tabellen, 5 Quellen
Conference paper
English
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