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  • 1
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    In:  Bull. Seism. Soc. Am., Heidelberg, 1, vol. 90, no. 5, pp. 1251-1262, pp. 8010, (ISBN: 0534351875, 2nd edition)
    Publication Date: 2000
    Keywords: Three dimensional ; Strong motions ; USA ; Fault zone ; Site amplification ; BSSA
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  • 2
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    In:  Geophysics, Stockholm, Wissenschaftliche Buchgesellschaft, vol. 63, no. 2, pp. 479-489, pp. L15318, (ISSN: 1340-4202)
    Publication Date: 1998
    Keywords: Fault zone ; Earthquake hazard ; Seismics (controlled source seismology) ; Deep seismic sounding (espec. cont. crust)
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  • 3
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    In:  J. Geophys. Res., Würzburg, Pergamon, vol. 98, no. 44, pp. 8211-8223, pp. B05S01, (ISSN: 1340-4202)
    Publication Date: 1993
    Keywords: Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Tectonics ; Fault zone ; Reflection seismics ; JGR
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  • 4
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    In:  Bulletin of the Seismological Society of America, Würzburg, Pergamon, vol. 92, no. 6, pp. 2504-2520, pp. B05S01, (ISSN: 1340-4202)
    Publication Date: 2002
    Keywords: Deep seismic sounding (espec. cont. crust) ; Reflection seismics ; Fault zone ; SAF ; USA ; Seismics (controlled source seismology) ; BSSA
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  • 5
    Publication Date: 2019-07-12
    Description: A cooperative flight test campaign between NASA and the U.S. Army was performed from September 2014 to February 2015. The purposes of the testing were to: investigate the effects of altitude variation on noise generation, investigate the effects of gross weight variation on noise generation, establish the statistical variability in acoustic flight testing of helicopters, and characterize the effects of transient maneuvers on radiated noise for a medium-lift utility helicopter. This test was performed at three test sites (0, 4000, and 7000 feet above mean sea level) with two aircraft (AS350 SD1 and EH-60L) tested at each site. This report provides an overview of the test, documents the data acquired and describes the formats of the stored data.
    Keywords: Acoustics
    Type: NASA/TM-2016-219354 , L-20729 , NF1676L-24899
    Format: application/pdf
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  • 6
    Publication Date: 2019-07-13
    Description: This paper presents an overview of a flight test campaign performed at different test sites whose altitudes ranged from 0 to 7000 feet above mean sea level (AMSL) between September 2014 and February 2015. The purposes of this campaign were to: investigate the effects of altitude variation on noise generation, investigate the effects of gross weight variation on noise generation, establish the statistical variability in acoustic flight testing of helicopters, and characterize the effects of transient maneuvers on radiated noise for a medium-lift utility helicopter. In addition to describing the test campaign, results of the acoustic effects of altitude variation for the AS350 SD1 and EH-60L aircraft are presented. Large changes in acoustic amplitudes were observed in response to changes in ambient conditions when the helicopter was flown at constant indicated airspeed and gross weight at the three test sites. However, acoustic amplitudes were found to scale with ambient pressure when flight conditions were defined in terms of the non-dimensional parameters, such as the weight coefficient and effective hover tip Mach number.
    Keywords: Acoustics
    Type: NF1676L-22567 , American Helicopter Society (AHS) Annual Forum; 17-19 May 2016; West Palm Beach, FL; United States
    Format: application/pdf
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  • 7
    Publication Date: 2019-07-13
    Description: No abstract available
    Keywords: Acoustics
    Type: NF1676L-21246 , 2015 Acoustics Technical Working Group Meeting; 21-22 Apr. 2015; Hampton, VA; United States
    Format: application/pdf
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  • 8
    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; 9-11 May 2017; Fort Worth, TX; United States
    Format: application/pdf
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  • 9
    Publication Date: 2019-07-20
    Description: The purpose of this study is to characterize auditory filters at low frequencies, defined as below about 100 Hz. Three experiments were designed and executed. They were conducted in the Exterior Effects Room at the NASA Langley Research Center, a psychoacoustic facility designed for presentation of aircraft flyover sounds to groups of test subjects. The first experiment measured 36 subjects hearing threshold for pure tones (at 25, 31.5, 40, 50, 63 and 80 Hz) in quiet conditions. The subjects, male and female, had a wide age range. This experiment allowed the performance of the test facility to be assessed and also provided screened test subjects for participation in subsequent experiments. The second and third experiments used 20 and 10 test subjects, respectively, and measured psychophysical tuning curves (PTCs) that describe auditory filters with center frequencies of approximately 63 and 50 Hz. The latter is assumed to be the lowest (bottom) auditory filter; thus, sounds at frequencies below about 50 Hz are perceived via the lower skirt of this lowest filter. All experiments used an adaptive, three-alternative forced-choice test procedure using either variable level tones or variable level, narrowband noise maskers. Measured PTCs were found to be very similar to other recently published data, both in terms of mean values and intersubject variation, despite different experimental protocols, different test facilities, and a wide range in subjects age.
    Keywords: Acoustics
    Type: NASA/TM?2019-220120 , L-20983 , NF1676L-31935
    Format: application/pdf
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  • 10
    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; 4-8 Dec. 2017; New Orleans, LA; United States
    Format: application/pdf
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