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Tuesday, July 28, 2020 | History

2 edition of Sonic-boom minimization with nose-bluntness relaxation found in the catalog.

Sonic-boom minimization with nose-bluntness relaxation

Christine M. Darden

Sonic-boom minimization with nose-bluntness relaxation

by Christine M. Darden

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Published by National Aeronautics and Space Administration, Scientific and Technical Information Office, for sale by the National Technical Information Service in [Washington], Springfield, Va .
Written in English

    Subjects:
  • Noses (Aircraft),
  • Sonic boom -- Computer programs.,
  • Sonic boom -- Mathematical models.

  • Edition Notes

    StatementChristine M. Darden, Langley Research Center.
    SeriesNASA technical paper ; 1348, NASA technical paper -- 1348.
    ContributionsLangley Research Center., United States. National Aeronautics and Space Administration. Scientific and Technical Information Office.
    The Physical Object
    Pagination50 p. :
    Number of Pages50
    ID Numbers
    Open LibraryOL17538794M

    Objectives to be achieved by this invention are the provision of a method for determining the ultimate fuselage shape of supersonic aircraft by integral modification of the upper and lower surface shapes of the fuselage, to reduce sonic boom without increasing wave drag, as well as the provision of such a fuselage front section shape. A method for determining the fuselage shape of an aircraft Cited by: Sonic-Boom Mitigation Through Aircraft Design and Adjoint Methodology An, Bn = matrices during the first relaxation process A n 2 literature for sonic-boom minimization use near-field target matching. The main reason for this is that near-field matching is.

    9 60’s’s Concorde U.S. SST Mach: TOGW , - , lbs Payload: Passengers Sonic Boom Basics Community Impact Shaping Concepts. Articles: Buckley, Cara. “On Being a Black Female Math Whiz During the Space Race,” New York Times [Books Section] September 5, Darden, Christine. “Sonic-Boom Minimization with Nose-Bluntness Relaxation” Technical Journal, January 1, Retrieved Decem Darden, Christine.

      Karr C.L., Bowersox R., Singh V. () Minimization of Sonic Boom on Supersonic Aircraft Using an Evolutionary Algorithm. In: Cantú-Paz E. et al. (eds) Genetic and Evolutionary Computation — GECCO GECCO Lecture Notes in Computer Science, vol Springer, Berlin, Heidelberg. First Online 18 June Cited by: 6. on minimization of its time was published by Seebass and George in (Ref. 18). The area distributions required for sonic boom minimization, however, are not the same as those required for minimum wave drag. Specifically, sonic boom minimization requires a more rapid buildup of volume at the nose of the vehicle. This nose bluntness in-.


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Sonic-boom minimization with nose-bluntness relaxation by Christine M. Darden Download PDF EPUB FB2

Region. Because extreme nose bluntness produces large drag, a method of relaxing the bluntness requirement is needed to offer the opportunity for compromise between blunt-nose, low-boom and sharp-nose, low-drag configurations. This analysis extends the work of Seebass and George (ref. 6) and Darden (ref.

7) to include nose-bluntness Size: 1MB. Sonic-boom minimization with nose-bluntness relaxation. [Washington]: National Aeronautics and Space Administration, Scientific and Technical Information Office ; Springfield, Va.: For sale by the National Technical Information Service, "The Sonic Boom will alter how you hear the world." --TIME"Equal parts sociological study and business advice, using unique everyday examples– for instance, how the fate of the Chili’s fajita empire rested on the sound of the sizzling platter, and how Disneyland approaches soundscapes for a fully immersive Sonic-boom minimization with nose-bluntness relaxation book to explain how sound effects our mood and shopping habits."Cited by: 2.

American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA Sonic-boom minimization with nose-bluntness relaxation / By Christine M.

Darden, United States. National Aeronautics and Space Administration. Internet Topics: Sonic boom, Sonic boom, Noses (Aircraft) Publisher: [Washington]: National Aeronautics and Space Administration, Scientific and Technical Information Office ; Springfield, Va.: For.

Summary In this paper lower bounds are obtained for the intensity of the sonic bang resulting from a slender aircraft flying straight and level at supersonic speeds. sonic boom minimization technique is reformulated as an optimization problem and bo om propagation is carried out in a probabilistic fashion.

A bi-level reverse optimization is. Sonic boom propagation revisited: A nonlinear geometrical acoustic model Aerospace Science and Technology, Vol. 23, No. 1 Multidisciplinary Optimization with Applications to Sonic-Boom Minimization.

The project's goal is to optimize shapes in order to reduce its sonic boom (see for an authoritative review on the sonic boom theory). The sonic boom is the ground shock signature produced by a body which moves at supersonic regime (see Figure 1).At this regime, any body can very likely develop a main shock wave which moves ahead of it at its (supersonic) speed.

Background The earliest efforts on sonic boom minimization through aircraft shaping began over four decades ago with the work of Jones 1 and Carlson 2 whose studies of the effects of airplane-configuration effects using the Whitham 3 far- field solutions of sonic-boom theory led to the definition of an equivalent-body shape that would produce.

The effect of nose-bluntness relaxation results in the desired decrease in drag but at the same time, increases sonic boom intensity, as compared to the original blunt-nosed SEEB body.

The FIG. 6 alternative does, however, reduce the off-body pressures to be much less than if no shock suppression technology was by: 3.

A Numerical Method for Calculating Near-Field Sonic-Boom Pressure Signatures. NASA Technical Note D, November Darden, Christine M.: Sonic-Boom Minimization with Nose-Bluntness Relaxation.

NASA Technical PublicationJanuary   Nonlinear propagation through a relaxing atmosphere of pressure disturbances extracted from a computational fluid dynamics (CFD) solution of the flow around a supersonic aircraft is simulated using an augmented Burgers equation. The effects of nonlinearity, geometrical spreading, atmospheric inhomogeneity, thermoviscous attenuation, and molecular vibration relaxation are taken into by:   In a publication entitled "Sonic-Boom Minimization with Nose Bluntness Relaxation," published as NASA TP,Darden added a shape for a relaxed bluntness nose that reduced bluntness drag.

sonic boom complaints submitted to the Air Force, more t from to Benson tackles the efforts of the newly formed NASA and its work with the supersonic transport (SST) concept. Coupled with NASA and USAF sonicboom research of the late fifties and sixties, the FAA entered the sonic-boom- research arena by participating inCited by: 3.

Numerical aspects of sonic-boom minimization Navid Allahverdi, Alejandro Pozo, and Enrique Zuazua Abstract. The propagation of the sonic-boom produced by supersonic air-crafts can be modeled by means of a nonlocal version of the viscous Burgers equation.

In this paper, motivated by the sonic-boom minimization problem. Nose-Bluntness Relaxation With By and Christine M. Darden and Christine M.

Darden Topics: Sonic-Boom Minimization. 4 Figure 2 F-functions vs. normalized distance for the POD and lobe-balanced optimized POD. Table 1 and Table 2, from Farhat et al.

[4] report the optimization results for the POD for cruise Mach numbers of and The first column indicates whether F-function lobe balancing was, or was not, Size: 1MB. Christine Darden (born Septemas Christine Mann) is an American mathematician, data analyst, and aeronautical engineer who devoted much of her year career in aerodynamics at NASA to researching supersonic flight and sonic had an M.S.

in mathematics and had been teaching at Virginia State University before starting to work at the Langley Research Center in Alma mater: Hampton University, ; Virginia.

quently in “Softening the Sonic Boom” and the first four chapters that follow. After a 2-year hiatus, I resumed sonic boom research in March on this new book.

I greatly appreciate the opportunity afforded me to write about this fascinating subject by the eminent aviation historian Dr. Richard P.

Hallion, editor of. The Sonic Boom book. Read 23 reviews from the world's largest community for readers. A surprising look at the hidden power of sound, revealing how people /5.Sonic boom generation and propagation Sonic boom minimization began with Busemann[2] who told us how to eliminate the wave drag and sonic boom due to the aircraft’s volume in Later, Seebass and coworkers[] contributed in Sonic Boom mitigation which included midfield : Lengyan, Qian Zhansen.NASA TECHNICAL NOTE NASA TN, D 00 c I P APPLICATION OF SONIC-BOOM MINIMIZATION CONCEPTS IN SUPERSONIC TRANSPORT DESIGN by Harry W, Carlson, Rdymond L.

Barger, and Robert J. Muck Lungley Research Center Hdmptolz, Vd. NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON, D. C. JUNE File Size: 2MB.