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  • 1
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    Design and analysis of low boom concepts at Langley Research Center (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The objective of the sonic boom research in the current High Speed Research Program is to ultimately make possible overland supersonic flight by a high speed civil transport. To accomplish this objective, it is felt that results in four areas must demonstrate that such a vehicle would be acceptable by the general public, by the airframers, and by the airlines. It should be demonstrated: (1) that some waveform shape has the possibility of being acceptable to the general public; (2) that the atmosphere would not totally destroy such a waveform during propagation; (3) that a viable airplane could be built which produces such a waveform; and (4) that any performance penalty suffered by a low boom aircraft would be counteracted by the economic benefit of overland supersonic flight. The work being done at LaRC is in support of the third element listed above--the area of configuration design. The initial part of the paper will give a review of the theory being used for configuration designs and discuss two theory validation models which were built and tested within the past two years. Discussion of the wind tunnel and theoretical results (linear theory and higher order methods) and their implications for future designs will be included.
    Keywords: ACOUSTICS
    Type: First Annual High-Speed Research Workshop, Part 2; p 675-699
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    A practical low-boom overpressure signature based on minimum sonic boom theory (1992)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A brief resume of sonic boom minimization methods is given to provide a background for a new, empirical modification of the Seebass and George minimum-nose-shock sonic boom F-function and signature. The new 'hybrid' F-function has all the inherent flexibility of application found with the Darden-modified Seebass and George F-function. In addition, it has enhanced this flexibility and applicability with neglegible increase in nose and/or tail shock strength. A description of this 'hybrid' F-function and signature is provided, and the benefits of using them to design high-performance, low-boom aircraft are discussed.
    Keywords: ACOUSTICS
    Type: High-Speed Research: Sonic Boom, Volume 2; p 15-29
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    A study of loudness as a metric for sonic boom acceptability (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A parametric study of loudness levels with respect to weight, altitude, and Mach number for sonic boom signatures generated by two Mach 2.0 conceptual configurations is presented and compared with a similar study for nose shock overpressure. This paper discusses the relative importance of the two sonic boom metrics and the implications of the trends shown. Of the two configurations considered in this study, one was designed for optimum aerodynamic performance and the second was designed to produce a constrained overpressure sonic boom signature at cruise flight conditions. Results indicate that reductions in both loudness and overpressure level are possible when the configuration is shaped to produce a low boom signature. Results also prove that the loudness metric is a more reliable measure of the disturbance due to sonic booms than nose shock overpressure, because the overpressure does not include the sometimes significant effects of embedded shocks which are often present in mid-field low boom signatures.
    Keywords: ACOUSTICS
    Type: AIAA PAPER 91-0496
    Format: text
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