AbstractTypical turboprop noise spectra exhibit a series of characteristic peaks which are directly related to the product of propeller rpm and number of propeller blades. These blade passage frequencies contribute significantly to the overall sound pressure level both outside and inside the aircraft. Their contribution to cabin noise is usually reduced by appropriately adjusted mass dampers. However, since the engine rpm varies for different flight stages, any fixed eigenfrequency absorber will merely be a sub-optimal compromise.The Tunable Vibration Absorber (TVA) introduced in this article has a variable resonant frequency which enables an adaptation to different flight phases providing largely improved performance. Frequency tuning is achieved through a piezo-electric stack actuator, which applies a pressure force to a pair of leaf springs thus reducing their effective bending stiffness.Among the main advantages of this particular approach are a static control signal and low power consumption. To enable a light-weight construction the components which generate the pressure loading are incorporated into the oscillating mass.The TVA allows to cover a wide frequency range using only a single device. Additionally, it features damping control capability and optional active multi-mode operation. Structural-acoustic simulations have indicated a noise reduction potential of approximately 10 dB.This article gives a short overview of different tuneable vibration absorber concepts, lines out the theoretical background of the proposed approach, discusses the general components layout and describes the experimental verification of a prototype TVA for the Airbus A400M.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    A vibration absorber with variable eigenfrequency for turboprop aircraft


    Beteiligte:
    Keye, S. (Autor:in) / Keimer, R. (Autor:in) / Homann, S. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2008-10-13


    Format / Umfang :

    7 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch






    Piezo Tuneable Vibration Absorber (PTVA) for turboprop aircraft

    Schneider, A. / Breitbach, E. / Keye, S. et al. | Tema Archiv | 2006


    One Lever Control for Variable Pitch Turboprop Aircraft

    Gaudio Giovanni / Dambrosio Lorenzo | DOAJ | 2020

    Freier Zugriff

    Large turboprop passenger aircraft engine vibration reduction installation system

    DONG WANYUAN / CHEN YONGHUI / WANG JIANQIANG et al. | Europäisches Patentamt | 2023

    Freier Zugriff