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  • 1
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    Community reactions to helicopter noise - Results from an experimental study (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Community reactions to low numbers of helicopter noise events (less than 50 per day) are investigated using a new type of study design. Although the effect of maximum noise level and number of noise events on helicopter noise annoyance was found to be similar to that represented by the energy summation principle contained in L(eq)-based noise indices, it is noted that the possibility that the number of noise events has only a small effect on annoyance cannot be rejected at the conventional p of less than 0.05 level. The effect of the duration of noise events was also shown to be consistent with L(eq)-based indices. After removing the effects of differences in duration and noise levels, little difference is found between reactions to impulsive and nonimpulsive types of helicopters.
    Keywords: ENVIRONMENT POLLUTION
    Type: Acoustical Society of America, Journal (ISSN 0001-4966); 82; 479-492
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Human response to aircraft noise (1991)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The human auditory system and the perception of sound are discussed. The major concentration is on the annnoyance response and methods for relating the physical characteristics of sound to those psychosociological attributes associated with human response. Results selected from the extensive laboratory and field research conducted on human response to aircraft noise over the past several decades are presented along with discussions of the methodology commonly used in conducting that research. Finally, some of the more common criteria, regulations, and recommended practices for the control or limitation of aircraft noise are examined in light of the research findings on human response.
    Keywords: ACOUSTICS
    Type: Aeroacoustics of Flight Vehicles: Theory and Practice. Volume 2: Noise Control; p 1-52
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Anticipated Effectiveness of Active Noise Control in Propeller Aircraft Interiors as Determined by Sound Quality Tests (2004)
    In:  CASI
    Details
    Publication Date: 2018-06-02
    Description: Two experiments were conducted, using sound quality engineering practices, to determine the subjective effectiveness of hypothetical active noise control systems in a range of propeller aircraft. The two tests differed by the type of judgments made by the subjects: pair comparisons in the first test and numerical category scaling in the second. Although the results of the two tests were in general agreement that the hypothetical active control measures improved the interior noise environments, the pair comparison method appears to be more sensitive to subtle changes in the characteristics of the sounds which are related to passenger preference.
    Keywords: Aircraft Propulsion and Power
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    NASA's Subsonic Jet Transport Noise Reduction Research (2000)
    In:  CASI
    Details
    Publication Date: 2018-06-02
    Description: Although new jet transport airplanes in today s fleet are considerably quieter than the first jet transports introduced about 40 years ago, airport community noise continues to be an important environmental issue. NASA s Advanced Subsonic Transport (AST) Noise Reduction program was begun in 1994 as a seven-year effort to develop technology to reduce jet transport noise 10 dB relative to 1992 technology. This program provides for reductions in engine source noise, improvements in nacelle acoustic treatments, reductions in the noise generated by the airframe, and improvements in the way airplanes are operated in the airport environs. These noise reduction efforts will terminate at the end of 2001 and it appears that the objective will be met. However, because of an anticipated 3-8% growth in passenger and cargo operations well into the 21st Century and the slow introduction of new the noise reduction technology into the fleet, world aircraft noise impact will remain essentially constant until about 2020 to 2030 and thereafter begin to rise. Therefore NASA has begun planning with the Federal Aviation Administration, industry, universities and environmental interest groups in the USA for a new noise reduction initiative to provide technology for significant further reductions.
    Keywords: Aircraft Design, Testing and Performance
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Acoustic testing of high temperature panels (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Results are presented of a series of thermal-acoustic tests conducted on the NASA Langley Research Center Thermal-Acoustic Test Apparatus to (1) investigate techniques for obtaining strain measurements on metallic and carbon-carbon materials at elevated temperature; (2) document the dynamic strain response characteristics of several superalloy honeycomb thermal protection system panels at elevated temperatures of up to 1200 F; and (3) determine the strain response and sonic fatigue behavior of four carbon-carbon panels at both ambient and elevated temperatures. A second study tested four carbon-carbon panels to document panel dynamic response characteristics at ambient and elevated temperature, determine time to failure and faliure modes, and collect continuous strain data up to panel failure. Strain data are presented from both types of panels, and problems encountered in obtaining reliable strain data on the carbon-carbon panels are described. The failure modes of the carbon-carbon panels are examined.
    Keywords: ACOUSTICS
    Type: AIAA PAPER 90-3939
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    The Calculated Response of a Three-Crystal Pair Spectrometer (1969)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Three crystal sodium iodide pair spectrometers
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-X-1857
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    ATP Interior Noise Technology and Flight Demonstration Program (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The paper provides an overview of the ATP (Advanced Turboprop Program) acoustics program with emphasis on the NASA technology program and the recent NASA/Industry demonstration programs aimed at understanding and controlling passenger cabin noise. Technology developments in propeller (source) noise, cabin noise transmission, and subjective acoustics are described. Finally, an overview of the industry demonstrator programs is presented.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NOISE-CON 88; Jun 20, 1988 - Jun 22, 1988; West Lafayette, IN; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Status of sonic boom methodology and understanding (1989)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: In January 1988, approximately 60 representatives of industry, academia, government, and the military gathered at NASA-Langley for a 2 day workshop on the state-of-the-art of sonic boom physics, methodology, and understanding. The purpose of the workshop was to assess the sonic boom area, to determine areas where additional sonic boom research is needed, and to establish some strategies and priorities in this sonic boom research. Attendees included many internationally recognized sonic boom experts who had been very active in the Supersonic Transport (SST) and Supersonic Cruise Aircraft Research Programs of the 60's and 70's. Summaries of the assessed state-of-the-art and the research needs in theory, minimization, atmospheric effects during propagation, and human response are given.
    Keywords: AERODYNAMICS
    Type: NASA-CP-3027 , L-16567 , NAS 1.55:3027 , Sonic Boom Workshop; Jan 01, 1988; Hampton, VA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Aircraft noise induced building vibration and effects on human response (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The acoustic loads resulting from aircraft noise and sonic booms which can induce vibration in the structure and result in radiation of noise into its interior, rattling of items in contact with the structure, and the perception of the inhabitants that the structure is vibrating, are investigated. In particular, the response of buildings, particularly residential structures, to aircraft noise and the resulting effects on human response have been the subjects of considerable research at the NASA Langley Research Center. These studies are reviewed with particular emphasis on the response of houses to aircraft overflight noise and any increase in noise annoyance caused by the perception of vibration and rattling.
    Keywords: ENVIRONMENT POLLUTION
    Type: International Conference on Noise Control Engineering; Dec 04, 1989 - Dec 06, 1989; Newport Beach, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Relationship between Aircraft Noise Contour Area and Noise Levels at Certification Points (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: The use of sound exposure level contour area reduction has been proposed as an alternative or supplemental metric of progress and success for the NASA Quiet Aircraft Technology program, which currently uses the average of predicted noise reductions at three community locations. As the program has expanded to include reductions in airframe noise as well as reduction due to optimization of operating procedures for lower noise, there is concern that the three-point methodology may not represent a fair measure of benefit to airport communities. This paper addresses several topics related to this proposal: (1) an analytical basis for a relationship between certification noise levels and noise contour areas for departure operations is developed, (2) the relationship between predicted noise contour area and the noise levels measured or predicted at the certification measurement points is examined for a wide range of commercial and business aircraft, and (3) reductions in contour area for low-noise approach scenarios are predicted and equivalent reductions in source noise are determined.
    Keywords: Air Transportation and Safety
    Type: NASA/TM-2003-212649 , L-18333 , NAS 1.15:212649
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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