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  • 1
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    Airport-Noise Levels and Annoyance Model (ALAMO) system's reference manual (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The airport-noise levels and annoyance model (ALAMO) is described in terms of the constituent modules, the execution of ALAMO procedure files, necessary for system execution, and the source code documentation associated with code development at Langley Research Center. The modules constituting ALAMO are presented both in flow graph form, and through a description of the subroutines and functions that comprise them.
    Keywords: ACOUSTICS
    Type: NASA-TM-87694 , NAS 1.15:87694
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Airport-Noise Levels and Annoyance Model (ALAMO) user's guide (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A guide for the use of the Airport-Noise Level and Annoyance MOdel (ALAMO) at the Langley Research Center computer complex is provided. This document is divided into 5 primary sections, the introduction, the purpose of the model, and an in-depth description of the following subsystems: baseline, noise reduction simulation and track analysis. For each subsystem, the user is provided with a description of architecture, an explanation of subsystem use, sample results, and a case runner's check list. It is assumed that the user is familiar with the operations at the Langley Research Center (LaRC) computer complex, the Network Operating System (NOS 1.4) and CYBER Control Language. Incorporated within the ALAMO model is a census database system called SITE II.
    Keywords: ACOUSTICS
    Type: NASA-TM-87695 , NAS 1.15:87695
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Location of noise sources using a phase-slope method (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Two three-element microphone arrays have been used to predict the position of both pure-tone and broadband noise sources in an anechoic chamber under different ground impedance conditions. Source positions are predicted using the slope of phase-frequency plots between array elements. A phase-slope method for quantitatively assessing both the accuracy and precision of estimates of noise source location is introduced and illustrated. When the phase-slope method is used, there is higher accuracy and more precision in estimates of source location with a small ground impedance than with a large ground impedance. As would be expected, ground impedance effects are larger for low elevation angles than for high elevation angles.
    Keywords: ACOUSTICS
    Type: NASA-TP-2505 , L-15793 , NAS 1.60:2505
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Concorde noise-induced building vibrations, John F. Kennedy International Airport (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The outdoor/indoor noise levels and associated vibration levels resulting from aircraft and nonaircraft events were recorded at eight homesites and a school. In addition, limited subjective tests were conducted to examine the human detection/annoyance thresholds for building vibration and rattle caused by aircraft noise. Presented herein are the majority of the window and wall vibration data recorded during Concorde and subsonic aircraft overflights.
    Keywords: ACOUSTICS
    Type: NASA-TM-78676 , REPT-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Concorde noise-induced building vibrations for Sully Plantation, Chantilly, Virginia (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A study to assess the noise-induced building vibrations associated with Concorde operations is presented. The approach is to record the levels of induced vibrations and associated indoor/outdoor noise levels in selected homes, historic and other buildings near Dulles and Kennedy International Airports. Presented is a small, representative sample of data recorded at Sully Plantation, Chantilly, Virginia during the period of May 20 through May 28, 1976. Recorded data provide relationships between the vibration levels of walls, floors, windows, and the noise associated with Concorde operations (2 landings and 3 takeoffs), other aircraft, nonaircraft sources, and normal household activities. Results suggest that building vibrations resulting from aircraft operations were proportional to the overall sound pressure levels and relatively insensitive to spectral differences associated with the different types of aircraft. Furthermore, the maximum levels of vibratory response resulting from Concorde operations were higher than those associated with conventional aircraft. The vibrations of nonaircraft events were observed in some cases to exceed the levels resulting from aircraft operations. These nonaircraft events are currently being analyzed in greater detail.
    Keywords: ACOUSTICS
    Type: NASA-TM-X-73919 , REPT-2630
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Concorde noise-induced building vibrations: John F. Kennedy International Airport (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Outdoor and indoor noise levels resulting from aircraft flyovers and certain nonaircraft events were recorded at eight homesites and a school along with the associated vibration levels in the walls, windows, and floors at these test sites. Limited subjective tests were conducted to examine the human detection and annoyance thresholds for building vibration and rattle caused by aircraft noise. Both vibration and rattle were detected subjectively in several houses for some operations of both the Concorde and subsonic aircraft. Seated subjects more readily detected floor vibrations than wall or window vibrations. Aircraft noise generally caused more window vibrations than common nonaircraft events such as walking and closing doors. Nonaircraft events and aircraft flyovers resulted in comparable wall vibration levels, while floor vibrations were generally greater for nonaircraft events than for aircraft flyovers. The relationship between structural vibration and aircraft noise is linear, with vibration levels being accurately predicted from overall sound pressure levels (OASPL) measured near the structure. Relatively high levels of structural vibration measured during Concorde operations are due more to higher OASPL levels than to unique Concorde-source characteristics.
    Keywords: ACOUSTICS
    Type: NASA-TM-78727 , REPT-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Concorde noise-induced building vibrations John F. Kennedy International Airport (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The outdoor and indoor noise levels resulting from aircraft flyovers and certain nonaircraft events were recorded at six home sites along with the associated vibration levels in the walls, windows, and floors of these test homes. Limited subjective tests conducted to examine the human detection and annoyance thresholds for building vibration and rattle caused by aircraft noise showed that both vibration and rattle were detected subjectively in several houses for some operations of both the Concorde and subsonic aircraft. Preliminary results indicate that the relationship between window vibration and aircraft noise is: (1) linear, with vibration levels being accurately predicted from OASPL levels measured near the window; (2) consistent from flyover to flyover for a given aircraft type under approach conditions; (3) no different for Concorde than for other conventional jet transports (in the case of window vibrations induced under approach power conditions); and (4) relatively high levels of window vibration measured during Concorde operations are due more to higher OASPL levels than to unique Concorde source characteristics.
    Keywords: ACOUSTICS
    Type: NASA-TM-78660 , REPT-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Concorde noise-induced building vibrations: International Airport Dulles (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A series of studies were conducted to assess the noise-induced building vibrations associated with Concorde operations. The vibration levels of windows, walls, and floors were measured along with the associated noise levels of Concorde, subsonic aircraft and some nonaircraft events. Test sites included Sully Plantation which is adjacent to Dulles International Airport and three residential homes located in Montgomery County, Maryland. The measured vibration response levels due to Concorde operations were found to be: (1) higher than the levels due to other aircraft, (2) less than the levels due to certain household events which involve direct impulsive loading such as door and window closing, (3) less than criteria levels for building damage, and (4) comparable to levels which are perceptible to people.
    Keywords: ACOUSTICS
    Type: NASA-TM-74083
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Concorde Noise-Induced Building Vibrations, Montgomery County, Maryland (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A series of studies are reported to assess the noise induced building vibrations associated with Concorde operations. The levels of induced vibration and associated indoor/outdoor noise levels resulting from aircraft and nonaircraft events in selected homes, historic and other buildings near Dulles International Airport were recorded. The building response resulting from aircraft operations was found to be directly proportional to the overall sound pressure level and approximately independent of the aircraft type. The noise levels and, consequently, the response levels were observed to be higher for the Concorde operations than for the CTOL operations. Furthermore, the vibration could be closely reproduced by playing aircraft noise through a loudspeaker system located near the vibration measurement location. Nonaircraft events such as door closing were again observed to result in higher response levels than those induced by aircraft.
    Keywords: ACOUSTICS
    Type: NASA-TM-X-73947 , REPT-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    The noise impact of proposed runway alternatives at Craig Airport (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Four proposed runway expansion alternatives at Craig Airport in Jacksonville, Florida have been assessed with respect to their forecasted noise impact in the year 2005. The assessment accounts for population distributions around the airport and human subjective response to noise, as well as the distribution of noise levels in the surrounding community (footprints). The impact analysis was performed using the Airport-noise Levels and Annoyance Model (ALAMO), an airport community response model recently developd at Langley Research Center.
    Keywords: ACOUSTICS
    Type: NASA-TM-84503 , NAS 1.15:84503
    Format: application/pdf
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