The recent flight demonstration of shaped sonic booms shows the potential for quiet overland supersonic flight, which could revolutionize air transport. To successfully design quiet supersonic aircraft, the upper limit of an acceptable noise level must be determined through quantitative recording and subjective human response measurements. Past efforts have concentrated on the use of sonic boom simulators to assess human response, but simulators often cannot reproduce a realistic sonic boom sound. Until now, molecular relaxation effects on low overpressure rise time had never been compared with flight data. Supersonic flight slower than the cutoff Mach number, which generates evanescent waves, also prevents loud sonic booms from impacting the ground. The loudness of these evanescent waves can be computed, but flight measurement validation is needed. A novel flight demonstration technique that generates low overpressure N-waves using conventional military aircraft is outlined, in addition to initial quantitative flight data. As part of this demonstration, evanescent waves also will be recorded.


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    Titel :

    Flight Demonstration Of Low Overpressure N-Wave Sonic Booms And Evanescent Waves


    Beteiligte:

    Kongress:

    International Sonic Boom Forum ; 2005 ; State College, PA, United States
    17th International Symposium of Nonlinear Acoustics ; 2005 ; State College, PA, United States


    Erscheinungsdatum :

    01.01.2005


    Medientyp :

    Preprint


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :


    Flight Demonstration of Low Overpressure N-Wave Sonic Booms and Evanescent Waves

    E. A. Haering / J. W. Smolka / J. W. Murray et al. | NTIS | 2005


    Underwater Overpressure from Hypervelocity Sonic Booms

    Wang, J. / Griffice, C. / Edwards, J. et al. | British Library Conference Proceedings | 2008


    Underwater Overpressure from Hypervelocity Sonic Booms

    Wang, J. / Griffice, C. / Edwards, J et al. | AIAA | 2008