A new main rotor system has been developed and flight test evaluated on a Bell Model 412 helicopter to assess its capability at Fuji Heavy Industries (FHI). The rotor system, designated the Fuji Bearingless Rotor (FBR), is an all-composite, four-bladed, soft-inplane bearingless main rotor for 10000 lbs. to 12000 lbs. gross weight helicopters. Based on the advanced composite technology at FHI along with the extensive research on aerodynamics, noise, and vibration, the rotor system was planned and developed for new generation helicopters with challenging design objectives. Beginning by introducing brief descriptions of the FBR systen, overviews of aerodynamic low noise and low 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 as expected, a significant reduction in noise emission, and a remarkable reduction of vibration levels. What had not been expected in the design, remarkable reduction in hover noise and cabin noise were observed. In conclusion, it was confirmed, that the design objectives have been achieved or in part surpassed and the FBR system has demonstrated its capability.


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    Title :

    Design and test evaluation of FBR bearingless main rotor


    Additional title:

    Konstruktion und Erprobung des lagerlosen Hauptrotors von Fuji


    Contributors:
    Nakadate, M. (author) / Kawakami, N. (author) / Takaki, J. (author)


    Publication date :

    1997


    Size :

    10 Seiten, 19 Bilder, 1 Tabelle, 10 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Design and Test Evaluation of FBR Bearingless Main Rotor

    Nakadate, M. / Kawakami, N. / Takaki, J. et al. | British Library Conference Proceedings | 1997


    Design and test evaluation of FBR bearingless main rotor

    Nakadate, M. / Taguchi, H. / Takaki, J. | Tema Archive | 2001