Blades of helicopter rotors, tilt rotors, and like reshaped to reduce noise, according to proposal. Planform features combination of rearward and forward sweep. Forward sweep over large outer portion of blade constitutes primary noise-reduction feature. Relieves some of compressive effect in tip region, with consequent reduction of noise from compressive sources. Performance at high advance ratio improved. Cabin vibration and loading noise reduced by load-averaging effect of double-sweep planform. Aft-swept section provides balancing of aerodynamic and other dynamic forces on blade along 1/4-chord line of straight inboard section and along projection of line to outermost blade radius. Possible for hub-hinge forces and moments to remain within practical bounds. Provides stabilizing blade forces and moments to counteract any instability caused by forward sweep.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Low-Noise Rotorcraft Blades


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    1994-11-01



    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :


    Low-Noise Rotorcraft Blades

    Online Contents | 1994


    Folding of rotorcraft rotor blades

    FENNY CARLOS A / SCHANK TROY / STAMPS FRANK B | Europäisches Patentamt | 2015

    Freier Zugriff

    FOLDING OF ROTORCRAFT ROTOR BLADES

    FENNY CARLOS A / SCHANK TROY / STAMPS FRANK B | Europäisches Patentamt | 2015

    Freier Zugriff

    Rotorcraft noise

    Ollerhead, J.B. | Tema Archiv | 1985


    Adjoint-Based Aerodynamic Shape Optimization of Rotorcraft Blades

    Nadarajah, S. / Tatossian, C. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2008