En Route Noise
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En Route Noise
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Author : United States. Federal Aviation Administration
language : en
Publisher:
Release Date : 1990
En Route Noise written by United States. Federal Aviation Administration and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.
Annoyance Caused By Aircraft En Route Noise
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-06-30
Annoyance Caused By Aircraft En Route Noise written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-06-30 with categories.
A laboratory experiment was conducted to quantify the annoyance response of people on the ground to enroute noise generated by aircraft at cruise conditions. The en route noises were ground level recordings of eight advanced turboprop aircraft flyovers and six conventional turbofan flyovers. The eight advanced turboprop enroute noises represented the NASA Propfan Test Assessment aircraft operating at different combinations of altitude, aircraft Mach number, and propeller tip speed. The conventional turbofan en route noises represented six different commercial airliners. The overall durations of the en route noises varied from approximately 40 to 160 sec. In the experiment, 32 subjects judged the annoyance of the en route noises as well as recordings of the takeoff and landing noises of each of 5 conventional turboprop and 5 conventional turbofan aircraft. Each of the noises was presented at three sound pressure levels to the subjects in an anechoic listening room. Analysis of the judgments found small differences in annoyance between three combinations of aircraft type and operation. Current tone and corrections did not significantly improve en route annoyance prediction. The optimum duration-correction magnitude for en route noise was approximately 1 dB per doubling of effective duration. Mccurdy, David A. Langley Research Center RTOP 535-03-11-03...
Annoyance Caused By Aircraft En Route Noise
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Author : David A. McCurdy
language : en
Publisher:
Release Date : 1992
Annoyance Caused By Aircraft En Route Noise written by David A. McCurdy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Aerodynamic noise categories.
Numerical Propagation Of Aircraft En Route Noise
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Author : Kieran Poulain
language : en
Publisher:
Release Date : 2011
Numerical Propagation Of Aircraft En Route Noise written by Kieran Poulain and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Aircraft En Route Noise Annoyance
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Author : David A. McCurdy
language : en
Publisher:
Release Date : 1990
Aircraft En Route Noise Annoyance written by David A. McCurdy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.
Audibility And Annoyance Of En Route Noise Of Unducted Fan Engines
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Author : S. A. Fidell
language : en
Publisher:
Release Date : 1990
Audibility And Annoyance Of En Route Noise Of Unducted Fan Engines written by S. A. Fidell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Airplanes categories.
Aircraft flyovers heard in high ambient noise urban environments are composed in large part of high absolute level, broadband noise. In contrast, noise exposure created en route by aircraft powered by unducted fan engines is expected to be relatively low in level, but to contain prominent low frequency tonal energy. These tones may be readily audible in low ambient noise rural environments. The annoyance of noise intrusions of low absolute level has been shown to be closely related to their audibility. Thus, one way to predict the annoyance of high altitude overflights by aircraft equipped with unducted fan engines is to estimate their audibility relative to that of conventionally powered aircraft in various ambient noise conditions. These predictions may be converted into estimates of the probability of high annoyance by means of a dosage-response relationship derived from laboratory data about the annoyance of individual noise intrusions. The latter estimates may in turn be applied to populations exposed to unducted fan engine noise over a range of assumed exposure levels. Application of these procedures to several assumed exposure cases suggests that millions of people in rural areas of the United States would be likely to be highly annoyed by the noise of aircraft powered by unducted fan engines. Keywords: Annoyance, Audibility, Noise exposure, Unducted fan engines. (SDW).
Audibility And Annoyance Of En Route Noise Of Unducted Fan Engines
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Author :
language : en
Publisher:
Release Date : 1990
Audibility And Annoyance Of En Route Noise Of Unducted Fan Engines written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Airplanes categories.
En Route Noise Levels From Propfan Test Assessment Airplane
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-07-02
En Route Noise Levels From Propfan Test Assessment Airplane written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-07-02 with categories.
The en route noise test was designed to characterize propagation of propfan noise from cruise altitudes to the ground. In-flight measurements of propfan source levels and directional patterns were made by a chase plane flying in formation with the propfan test assessment (PTA) airplane. Ground noise measurements were taken during repeated flights over a distributed microphone array. The microphone array on the ground was used to provide ensemble-averaged estimates of mean flyover noise levels, establish confidence limits for those means, and measure propagation-induced noise variability. Even for identical nominal cruise conditions, peak sound levels for individual overflights varied substantially about the average, particularly when overflights were performed on different days. Large day-to-day variations in peak level measurements appeared to be caused by large day-to-day differences in propagation conditions and tended to obscure small variations arising from operating conditions. A parametric evaluation of the sensitivity of this prediction method to weather measurement and source level uncertainties was also performed. In general, predictions showed good agreement with measurements. However, the method was unable to predict short-term variability of ensemble-averaged data within individual overflights. Although variations in absorption appear to be the dominant factor in variations of peak sound levels recorded on the ground, accurate predictions of those levels require that a complete description of operational conditions be taken into account. The comprehensive and integrated methods presented in this paper have adequately predicted ground-measured sound levels. On average, peak sound levels were predicted within 3 dB for each of the three different cruise conditions. Garber, Donald P. and Willshire, William L., Jr. Langley Research Center RTOP 535-03-11-02...
Faa Nasa En Route Noise Symposium
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Author :
language : en
Publisher:
Release Date : 1990
Faa Nasa En Route Noise Symposium written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Airplanes categories.
En Route Noise Levels From Propfan Test Assessment Airplane
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Author : Donald P. Garber
language : en
Publisher:
Release Date : 1994
En Route Noise Levels From Propfan Test Assessment Airplane written by Donald P. Garber and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Airplanes categories.