This chapter explores selected aspects of rotor acoustics. With increasingly stringent certification requirements, this field is becoming steadily more important in the design of rotorcraft. In this chapter, we discuss the importance of studying rotorcraft acoustics and the process used by regulators to evaluate their noise emissions. We then introduce the various noise sources and their importance in relation to the vehicle’s total noise emissions. We proceed by introducing Lighthill’s acoustic analogy and subsequently the Ffowcs Williams and Hawkings equation. Based on these, we describe a number of approaches to estimate the contributions of the various noise sources. We describe the implementation of an acoustic code and accompany with sample MATLAB scripts to evaluate the thickness and loading sources of an arbitrary rotor. We conclude the chapter by looking at a range of methods to reduce rotorcraft noise sources and discuss the future outlook for rotorcraft acoustics.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Rotor Acoustics


    Weitere Titelangaben:

    Springer Aerospace Techn.


    Beteiligte:
    Filippone, Antonio (Herausgeber:in) / Barakos, George (Herausgeber:in) / Smith, Dale (Autor:in) / Barakos, George (Autor:in)


    Erscheinungsdatum :

    2023-01-28


    Format / Umfang :

    33 pages





    Medientyp :

    Aufsatz/Kapitel (Buch)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    HELINOISE - The European Community rotor acoustics research program

    Heller, Hanno / Splettstoesser, Wolf / Kloeppel, Valentin et al. | AIAA | 1993


    Aerodynamics and acoustics of rotor blade-vortex interactions

    Yu, Yung H. / Tung, Chee / Gallman, Judith et al. | AIAA | 1995


    Higher-Order Statistical Metrics for Characterizing Rotor Acoustics

    Tinney, Charles E. / Valdez, John A. | TIBKAT | 2023


    Higher-order Statistical Metrics for Characterizing Rotor Acoustics.

    Tinney, Charles E. / Valdez, John A. | AIAA | 2023