The rise of the Urban Air Mobility market has spurred the design of a new generation of novel aircraft. To aid industry and researchers interested in these types of aircraft, the Revolutionary Vertical Lift Technology project at NASA has developed a fleet of reference vehicles for system studies. A new six-passenger reference vehicle has recently been added to the research portfolio that has ducted proprotors for propulsors. The ducts present an opportunity to apply acoustic treatment to the interior of the duct that could target both tonal and broadband noise, representative of the sound produced by this type of propulsor. In this paper, design methodologies are presented to design a variable depth liner for this application. An optimizer is used to design multiple liners with variable chamber depths. Experimental results from normal impedance testing are compared to numerical predictions using the optimizer model and a finite element model. Results show that an optimizer can be used to design an acoustic liner with favorable performance for a broad range of frequencies, which could be appropriate for a ducted proprotor application.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    An Initial Assessment of Variable Depth Liner Optimization for Ducted Proprotor Applications


    Beteiligte:
    Matthew B Galles (Autor:in) / Michael G Jones (Autor:in) / Douglas M Nark (Autor:in)

    Kongress:

    28th AIAA/CEAS Aeroacoustics Conference ; 2022 ; Southampton, GB


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :


    An Initial Assessment of Variable Depth Liner Optimization for Ducted Proprotor Applications

    Galles, Matthew B. / Jones, Michael G. / Nark, Douglas M. | AIAA | 2022


    An Initial Assessment of Variable Depth Liner Optimization for Ducted Proprotor Applications

    Galles, Matthew B. / Jones, Michael G. / Nark, Douglas M. | British Library Conference Proceedings | 2022


    Ducted Proprotor Systems Having Adaptive Duct Geometries

    THOMPSON GEORGE MATTHEW / PASSE BRAD JOSEPH / CARLSON NICHOLAS RALPH | Europäisches Patentamt | 2022

    Freier Zugriff

    Aerodynamic Optimization of a Coaxial Proprotor

    Leishman, J. G. / Ananthan, S. / American Helicopter Society | British Library Conference Proceedings | 2006


    Tilt-proprotor perspective

    Few, D. D. / Edenborough, H. K. | NTRS | 1977