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  • 2015-2019  (5)
  • 2005-2009
  • 2000-2004
  • 1985-1989
  • 1970-1974
Year
  • 1
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    Joint Eglin Acoustics Week 2013 Data Report (2017)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Far-field acoustic measurements were obtained for the AH-64D, HH-60M and CV-22B at the Eglin AFB, Test Area C-72, in July/August 2013. The primary purpose for this flight test was to obtain a benchmark database of detailed acoustic source noise characteristics for the aircraft operating at typical mission gross weights over a range of typical mission operating conditions. Data were acquired for a range of steady-state level and descending flight conditions, hover, and a variety of unsteady maneuver conditions. Between 30 and 37 microphones were deployed during these tests. Vehicle position and state data, as well as weather data were acquired simultaneously with the acoustic data. This paper describes the test aircraft, onboard instrumentation, ground instrumentation, and the data acquired. Data from this test are available upon request and review.
    Keywords: Aeronautics (General); Acoustics
    Type: NASA/TM-2017-219681 , AMRDEC-SR-RDMR-AD-17-02 , L-20832 , NF1676L-27413
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Ribozyme Evolution in an RNA-Mineral World (2017)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: No abstract available
    Keywords: Space Sciences (General)
    Type: ARC-E-DAA-TN42113 , Astrobiology Science Conference (AbSciCon 2017); Apr 24, 2017 - Apr 28, 2017; Mesa, AZ; United States
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  • 3
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    Establishing the Response of Low Frequency Auditory Filters (2017)
    In:  CASI
    Details
    Publication Date: 2019-07-19
    Description: The response of auditory filters is central to frequency selectivity of sound by the human auditory system. This is true especially for realistic complex sounds that are often encountered in many applications such as modeling the audibility of sound, voice recognition, noise cancelation, and the development of advanced hearing aid devices. The purpose of this study was to establish the response of low frequency (below 100Hz) auditory filters. Two experiments were designed and executed; the first was to measure subject's hearing threshold for pure tones (at 25, 31.5, 40, 50, 63 and 80 Hz), and the second was to measure the Psychophysical Tuning Curves (PTCs) at two signal frequencies (Fs= 40 and 63Hz). Experiment 1 involved 36 subjects while experiment 2 used 20 subjects selected from experiment 1. Both experiments were based on a 3-down 1-up 3AFC adaptive staircase test procedure using either a variable level narrow-band noise masker or a tone. A summary of the results includes masked threshold data in form of PTCs, the response of auditory filters, their distribution, and comparison with similar recently published data.
    Keywords: Acoustics
    Type: NF1676L-27590 , Meeting of the Acoustical Society of America; Dec 04, 2017 - Dec 08, 2017; New Orleans, LA; United States
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  • 4
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    Sound Diffraction Modeling of Rotorcraft Noise Around Terrain (2017)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A new computational technique, Wave Confinement (WC), is extended here to account for sound diffraction around arbitrary terrain. While diffraction around elementary scattering objects, such as a knife edge, single slit, disc, sphere, etc. has been studied for several decades, realistic environments still pose significant problems. This new technique is first validated against Sommerfeld's classical problem of diffraction due to a knife edge. This is followed by comparisons with diffraction over three-dimensional smooth obstacles, such as a disc and Gaussian hill. Finally, comparisons with flight test acoustics data measured behind a hill are also shown. Comparison between experiment and Wave Confinement prediction demonstrates that a Poisson spot occurred behind the isolated hill, resulting in significantly increased sound intensity near the center of the shadowed region.
    Keywords: Acoustics
    Type: NF1676L-25339 , AHS International Annual Forum and Technology Display; May 09, 2017 - May 11, 2017; Fort Worth, TX; United States
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  • 5
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    Global Exploration Roadmap Derived Concept for Human Exploration of the Moon (2017)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Taking advantage of the development of Mars-forward assets in cislunar space, a human lunar surface concept is proposed to maximize value for both lunar exploration and future deep space missions. The human lunar surface missions will be designed to build upon the cislunar activities that precede them, providing experience in planetary surface operations that cannot be obtained in cislunar space. To enable a five-mission limited campaign to the surface of the Moon, two new elements are required: a human lunar lander and a mobile surface habitat. The human lunar lander will have been developed throughout the cislunar phase from a subscale demonstrator and will consist of a descent module alongside a reusable ascent module. The reusable ascent module will be used for all five human lunar surface missions. Surface habitation, in the form of two small pressurized rovers, will enable 4 crew to spend up to 42 days on the lunar surface.
    Keywords: Spacecraft Design, Testing and Performance; Lunar and Planetary Science and Exploration
    Type: JSC-CN-39682 , Global Space Exploration Conference (GLEX) 2017; Jun 06, 2017 - Jun 08, 2017; Beijing; China
    Format: application/pdf
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