A new main rotor system has been developed and tested in flight at Fuji Heavy Industries Ltd. (FHI). The rotor system, designated the FBR (Fuji Bearingless Rotor), is an all composite, four-bladed, soft-inplane bearingless main rotor for a 10,000 lb to 12,000 lb gross weight helicopters. The FBR was tested on a Bell Mode 412 helicopter. Based on the advanced composite technology at FHI along with the extensive research on aerodynamics, noise, and vibration, the rotor system was designed and developed for new generation helicopters with challenging design objectives. The paper begins by providing a description of the FBR rotor system, the overviews of the aerodynamic flow noise and how vibration/dynamics design are presented. The flight test results with respect to performance, handling qualities, noise emission, and vibration levels are discussed. Overviews of structural features, strength substantiation, and ground test results are also presented. The rotor system has shown an improvement in high speed performance, a significant reduction in noise emission and a remarkable reduction in vibration levels. Remarkable reductions in hover noise and cabin noise were observed which were unexpected given that the low noise design was concentrated mostly on a high speed condition, and no intentional design effort was made for cabin noise. In conclusion, it was confirmed that the design objectives have been achieved or surpassed for the FBR rotor system.
Design and test evaluation of FBR bearingless main rotor
Auslegung und Test eines ungelagerten FBR-Hauptrotors
Journal of the American Helicopter Society ; 46 , 2 ; 107-116
2001
10 Seiten, 31 Bilder, 1 Tabelle, 18 Quellen
Aufsatz (Zeitschrift)
Englisch
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