Aircraft noise rating by A‐weighted sound exposure level, sidewise 1000 ft

1996 ◽  
Vol 100 (4) ◽  
pp. 2649-2649
Author(s):  
Robert W. Young
Keyword(s):  
Aircraft Noise ◽  
Exposure Level ◽  
Sound Exposure

Subtraction Analysis for Predicting the Propagation Effects of Aircraft Noise

2021 ◽  
Vol 263 (2) ◽  
pp. 4843-4850
Author(s):  
Yiming Wang ◽  
Kai Ming Li
Keyword(s):  
Time History ◽  
Federal Aviation Administration ◽  
Aircraft Noise ◽  
Design Tool ◽  
Exposure Level ◽  
Directivity Effect ◽  
Sound Exposure ◽  
Sound Levels ◽  
Propagation Effects ◽  
Recorded Data

In 2013, the Federal Aviation Administration and Volpe National Transportation System Center conducted a series of acoustic measurements with a propeller driven aircraft operating in the regions near Houston, Texas. The recorded data on octave band sound levels, aircraft locations, temperature and wind speed profiles were used in the current study to quantify the uncertainties for predicting the propagation effects of aircraft noise. Use of the Aviation Environmental Design Tool (AEDT) was explored for its accuracy and validity in real world scenarios offered by the dataset. The sound exposure level (SEL) data for each section of a flight path was used instead of the time history data for reducing the directivity effect of the sound source due to the change in its relative positions with the receivers. A subtraction-based method was introduced to analyze the propagation effect in which the SELs between two receiver locations were compared. The use of the subtraction method reduces the possible influences of the sound power variations along the flight paths. The measured data for a spiral and a level flight event were presented and the AEDT predictions on the propagation effects were examined in this paper.

An experiment on the feeling of separation when multiple aircraft noises are overlapped

2021 ◽  
Vol 263 (4) ◽  
pp. 2058-2063
Author(s):  
Makoto Morinaga ◽  
Takanori Matsui ◽  
Sonoko Kuwano ◽  
Seiichiro Namba
Keyword(s):  
Noise Level ◽  
Field Measurements ◽  
Aircraft Noise ◽  
Time Interval ◽  
Auditory Information ◽  
Exposure Level ◽  
Single Event ◽  
Considerable Time ◽  
Sound Sources ◽  
Sound Exposure

In order to calculate the A-weighted single event sound exposure level () of aircraft noise, the following method is described in the manual for aircraft noise measurement in Japan. Firstly a time-section, which is the range between two points where the noise level is 10 dB lower than the maximum noise level (), should be identified, and secondly the energy within the section is integrated. This method can easily be applied to the single event noises. When multiple aircraft noises are overlapped simultaneously, there are cases where cannot be calculated adequately by this method. In such cases, it is required to record the number of aircraft noises in the field measurements. However, even in the case of manned measurement, it is not easy to separate sound sources just by listening to the sound. A pilot study of the psychoacoustic experiment was conducted using the stimuli where multiple aircraft noises were overlapped in order to find what condition is needed so that multiple aircraft noises were separately perceived. It was suggested that a considerable time interval was needed so that people felt the separation between aircraft noises only with auditory information.

Aircraft noise-induced awakenings are more reasonably predicted from relative than from absolute sound exposure levels

2013 ◽  
Vol 134 (5) ◽  
pp. 3645-3653 ◽  
Author(s):  
Sanford Fidell ◽  
Barbara Tabachnick ◽  
Vincent Mestre ◽  
Linda Fidell
Keyword(s):  
Aircraft Noise ◽  
Sound Exposure ◽  
Exposure Levels

scholarly journals Background noise analysis in urban airport surroundings of Brazilian cities, Congonhas Airport, São Paulo

2016 ◽  
Vol 50 (0) ◽  
Author(s):  
Fabio Scatolini ◽  
Cláudio Jorge Pinto Alves
Keyword(s):  
Traffic Control ◽  
Background Noise ◽  
Noise Analysis ◽  
Exposure Level ◽  
Noise Levels ◽  
Sound Exposure ◽  
Operational Characteristics ◽  
Data Compilation ◽  
Noise Measurements ◽  
Noise Data

ABSTRACT OBJECTIVE To perform a quantitative analysis of the background noise at Congonhas Airport surroundings based on large sampling and measurements with no interruption. METHODS Measuring sites were chosen from 62 and 72 DNL (day-night-level) noise contours, in urban sites compatible with residential use. Fifteen sites were monitored for at least 168 hours without interruption or seven consecutive days. Data compilation was based on cross-reference between noise measurements and air traffic control records, and results were validated by airport meteorological reports. Preliminary diagnoses were established using the standard NBR-13368. Background noise values were calculated based on the Sound Exposure Level (SEL). Statistic parameters were calculated in one-hour intervals. RESULTS Only four of the fifteen sites assessed presented aircraft operations as a clear cause for the noise annoyance. Even so, it is possible to detect background noise levels above regulation limits during periods of low airport activity or when it closes at night. CONCLUSIONS All the sites monitored showed background noise levels above regulation limits between 7:00 and 21:00. In the intervals between 6:00-6:59 and 21:00-22:59 the noise data, when analyzed with the current airport operational characteristics, still allow the development of additional mitigating measures.

Assessment of Barotrauma Injury and Cumulative Sound Exposure Level in Salmon After Exposure to Impulsive Sound

2012 ◽  
pp. 235-237 ◽  
Author(s):  
Michele B. Halvorsen ◽  
Brandon M. Casper ◽  
Thomas J. Carlson ◽  
Christa M. Woodley ◽  
Arthur N. Popper
Keyword(s):  
Exposure Level ◽  
Sound Exposure

Assessment of cumulative sound exposure level as criterion for exposure of fish to impulsive sound.

2009 ◽  
Vol 125 (4) ◽  
pp. 2488-2488
Author(s):  
Michele B. Halvorsen ◽  
Thomas Carlson ◽  
Arthur N. Popper
Keyword(s):  
Exposure Level ◽  
Sound Exposure

Empirical modelling for derived metrics as function of sound exposure level in marine pile driving

2018 ◽  
Vol 144 (3) ◽  
pp. 1809-1809
Author(s):  
Roel A. Müller ◽  
Michael A. Ainslie ◽  
Michele B. Halvorsen ◽  
Tristan Lippert
Keyword(s):  
Pile Driving ◽  
Exposure Level ◽  
Empirical Modelling ◽  
Sound Exposure

scholarly journals Effects of Background Sounds on Annoyance Reaction to Foreground Sounds in Psychoacoustic Experiments in the Laboratory: Limits and Consequences

2019 ◽  
Vol 9 (9) ◽  
pp. 1872 ◽  
Author(s):  
Armin Taghipour ◽  
Eduardo Pelizzari
Keyword(s):  
Sound Propagation ◽  
Background Level ◽  
Sound Level ◽  
Exposure Level ◽  
Block Designs ◽  
Sound Exposure ◽  
Balanced Incomplete Block Designs ◽  
Balanced Incomplete Block ◽  
Realistic Scenes ◽  
Noise Production

In a variety of applications, e.g., psychoacoustic experiments, virtual sound propagation demonstration, or synthesized noise production, noise samples are played back in laboratories. To simulate realistic scenes or to mask unwanted background sounds, it is sometimes preferable to add background ambient sounds to the noise. However, this can influence noise perception. It should be ensured that either background sounds do not affect, e.g., annoyance from foreground noise or that possible effects can be quantified. Two laboratory experiments are reported, in which effects of mixing background sounds to foreground helicopter samples were investigated. By means of partially balanced incomplete block designs, possible effects of three independent variables, i.e., helicopter’s sound exposure level, background type, and background sound pressure level were tested on the dependent variable annoyance, rated on the ICBEN 11-point numerical scale. The main predictor of annoyance was helicopter’s sound exposure level. Stimuli with eventful background sounds were found to be more annoying than those with less eventful background sounds. Furthermore, background type and level interacted significantly. For the major part of the background sound level range, increasing the background level was associated with increased or decreased annoyance for stimuli with eventful and less eventful background sounds, respectively.

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