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  • 1
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    On Sonic Booms: People vs Planes (1968)
    American Institute of Physics
    Details
    Publication Date: 1968-06-01
    Print ISSN: 0031-9228
    Electronic ISSN: 1945-0699
    Topics: Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 2
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    Sonic booms (1968)
    American Institute of Physics
    Details
    Publication Date: 1968-02-01
    Print ISSN: 0031-9228
    Electronic ISSN: 1945-0699
    Topics: Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 3
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    Factors Relating to the Airport-Community Noise Problem (1965)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: Factors relating to the airport-community noise problem are discussed herein. The noise problems are associated with aircraft landing approaches, take-offs, and climbouts in communities near commercial airports. The main objectives are to identify the significant factors involved in the problem, to define some of their interrelationships, and to present recent related research information from NASA in-house and contract studies. Changes in the types of aircraft power plants, the aircraft operating procedures, and the community itself are all judged to be important; however, these changes should not be made without understanding the associated human-response implications.
    Keywords: Acoustics
    Type: NASA Conference on Aircraft Operating Problems: A Compilation of the Papers Presented; 73-81
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Aeroacoustics of large wind turbines (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: This paper reviews published information on aerodynamically generated noise from large horizontal axis wind turbines operated for electric power generation. Methods are presented for predicting both the discrete frequency rotational noise components and the broadband noise components, and results are compared with measurements. Refraction effects that result in the formation of high-frequency shadow zones in the upwind direction and channeling effects for the low frequencies in the downwind direction are illustrated. Special topics such as distributed source effects in prediction and the role of building dynamics in perception are also included.
    Keywords: ACOUSTICS
    Type: Acoustical Society of America, Journal (ISSN 0001-4966); 89; 2495-250
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Noise control in aeroacoustics; Proceedings of the 1993 National Conference on Noise Control Engineering, NOISE-CON 93, Williamsburg, VA, May 2-5, 1993 (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: In the conference over 100 papers were presented in eight sessions: (1) Emission: Noise Sources; (2) Physical Phenomena; (3) Noise ControlElements; (4) Vibration and Shock: Generation, Transmission, Isolation, and Reduction; (5) Immission: Physical Aspects of Environmental Noise; (6) Immission: Effects of Noise; (7) Analysis; and (8) Requirements. In addition, the distinguished lecture series included presentations on the High Speed Civil Transport and on research from the United Kingdom on aircraft noise effects.
    Keywords: ACOUSTICS
    Type: (ISSN 0736-2935); 651 p.
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Comparisons of Methods for Predicting Community Annoyance Due to Sonic Booms (1996)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Two approaches to the prediction of community response to sonic boom exposure are examined and compared. The first approach is based on the wealth of data concerning community response to common transportation noises coupled with results of a sonic boom/aircraft noise comparison study. The second approach is based on limited field studies of community response to sonic booms. Substantial differences between indoor and outdoor listening conditions are observed. Reasonable agreement is observed between predicted community responses and available measured responses.
    Keywords: Acoustics
    Type: NASA-TM-110289 , NAS 1.15:110289
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Wind turbine acoustics (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Available information on the physical characteristics of the noise generated by wind turbines is summarized, with example sound pressure time histories, narrow- and broadband frequency spectra, and noise radiation patterns. Reviewed are noise measurement standards, analysis technology, and a method of characterizing wind turbine noise. Prediction methods are given for both low-frequency rotational harmonics and broadband noise components. Also included are atmospheric propagation data showing the effects of distance and refraction by wind shear. Human perception thresholds, based on laboratory and field tests, are given. Building vibration analysis methods are summarized. The bibliography of this report lists technical publications on all aspects of wind turbine acoustics.
    Keywords: ACOUSTICS
    Type: NASA-TP-3057 , E-5663 , DOE/NASA/20320-77 , NAS 1.60:3057
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Aeroacoustics of Flight Vehicles: Theory and Practice. Volume 1: Noise Sources (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Methodology recommended to evaluate aeroacoustic related problems is provided, and approaches to their solutions are suggested without extensive tables, nomographs, and derivations. Orientation is toward flight vehicles and emphasis is on underlying physical concepts. Theoretical, experimental, and applied aspects are covered, including the main formulations and comparisons of theory and experiment. The topics covered include: propeller and propfan noise, rotor noise, turbomachinery noise, jet noise classical theory and experiments, noise from turbulent shear flows, jet noise generated by large-scale coherent motion, airframe noise, propulsive lift noise, combustion and core noise, and sonic booms.
    Keywords: ACOUSTICS
    Type: NASA-RP-1258-VOL-1 , L-16926-VOL-1 , NAS 1.61:1258-VOL-1 , WRDC-TR-90-3052-VOL-1 , AD-A241141
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Aeroacoustics of Flight Vehicles: Theory and Practice. Volume 2: Noise Control (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Flight vehicles and the underlying concepts of noise generation, noise propagation, noise prediction, and noise control are studied. This volume includes those chapters that relate to flight vehicle noise control and operations: human response to aircraft noise; atmospheric propagation; theoretical models for duct acoustic propagation and radiation; design and performance of duct acoustic treatment; jet noise suppression; interior noise; flyover noise measurement and prediction; and quiet aircraft design and operational characteristics.
    Keywords: ACOUSTICS
    Type: NASA-RP-1258-VOL-2 , L-16926-VOL-2 , NAS 1.61:1258-VOL-2 , WRDC-TR-90-3052-VOL-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Ground Measurements of the Shock-Wave Noise from Airplanes in Level Flight at Mach Numbers to 1.4 and at Altitudes to 45000 Feet (1959)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Time histories of noise pressures near ground level were measured during flight tests of fighter-type airplanes over fairly flat, partly wooded terrain in the e Mach number range between 1.13 and 1.4 and at altitudes from 25,000 to 45,000 feet. Atmospheric soundings and radar tracking studies were made for correlation with the measured noise data. The measured and calculated values of the pressure rise across the shock wave were generally in good agreement. There is a tendency for the theory to overestimate the pressure at locations remote from the track and to underestimate the pressures for conditions of high tailwind at altitude. The measured values of ground-reflection factor averaged about 1.8 f or the surface tested as compared to a theoretical value of 2.0. P o booms were measured in all cases. The observers also generally reported two booms; although, in some cases, only one boom was reported. The shock-wave noise associated with some of the flight tests was judged to be objectionable by ground observers, and in one case the cracking of a plate-glass store window was correlated in time with the passage of the airplane at an altitude of 25,000 feet.
    Keywords: Aerodynamics
    Type: NASA-TN-D-48
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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