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.

U.S. Federal Aviation Administration Neighborhood Environmental Survey: Noise Methodology

2021 ◽  
Vol 263 (1) ◽  
pp. 5828-5837
Author(s):  
Joseph Czech ◽  
Mary Ellen Eagan
Keyword(s):  
Dose Response ◽  
Response Curve ◽  
Research Team ◽  
Noise Exposure ◽  
Federal Aviation Administration ◽  
The United States ◽  
Aircraft Noise ◽  
Dose Response Curve ◽  
Exposure Level ◽  
Environmental Survey

As part of the agency's broader noise research program, the Federal Aviation Administration (FAA) has undertaken a multi-year research effort to quantify the impacts of aircraft noise exposure on communities around commercial service airports in the United States (U.S.). The overall goal of the study was to produce an updated and nationally representative civil aircraft dose-response curve; providing the relationship between annoyance and aircraft noise exposure around U.S. airport communities. To meet this goal, the FAA sponsored a research team to help design and conduct a national survey, known as the Neighborhood Environmental Survey (NES). A multi-stage and statistically rigorous process was used to select a representative sample of US airports, including a balanced sampling frame that included six factors: geographic distribution, temperature, day-night split, operational tempo, fleet mis, and population density. The research team computed Day-Night Average Sound Levels (DNL) for the 20 airports in two waves: first for survey respondent selection, and then for pairing with respondent locations to create the dose response curve. Analysis of the responses and the associated DNL was used to generate dose-response curves for each individual airport and a national dose-response curve showing the percent "Highly Annoyed" for a given noise level. The National dose-response curve created from the mail questionnaire shows considerably more people are highly annoyed by aircraft noise at a given noise exposure level compared to historical FICON data. This paper presents the airport selection and noise modeling process used to support the creation of the National dose-response curve. Additional information describing the motivation to conduct the NES and how its findings will help inform ongoing work to address aircraft noise concerns; and the survey methodology are provided in companion papers.

A sound exposure level study near the Camden Sound area, Browse Basin

2011 ◽  
Vol 51 (2) ◽  
pp. 705
Author(s):  
Andrew Long ◽  
Alec Duncan ◽  
Amos Maggi ◽  
Jeremy Colman ◽  
Jens Wisløff ◽  
...  
Keyword(s):  
Sound Level ◽  
Seismic Survey ◽  
Exposure Level ◽  
Underwater Sound ◽  
Marine Animals ◽  
Worst Case ◽  
Sound Exposure ◽  
Sound Levels ◽  
Marine Seismic ◽  
Threshold Criteria

A common approach to environmental risk assessment when assessing the level of risk to marine animals during marine seismic surveys is to compare either measured or modelled estimates of underwater sound levels to a known sound level threshold criteria. Over the years, a number of measures have been used to calculate and characterise underwater sound thresholds, including: sound pressure level (SPL), a root mean square (RMS) calculation, and—more recently—sound exposure level (SEL). SEL was suggested in 2007 by an expert panel of researchers as an appropriate measure to reduce the risk of temporary threshold shift (TTS) occurring in marine animals. Petroleum Geo-Services (PGS) commissioned an SEL study in preparation for a large MultiClient 3D seismic survey planned for the environmentally sensitive Camden Sound area, Western Australia, in late 2010. The Centre for Marine Science and Technology (CMST) at Curtin University built a comprehensive bathymetric model of the Camden Sound area and used two seabed geoacoustic models, with sand/limestone—as worst case, most reflective—and silt—as best case, least reflective. Acoustic propagation modelling over the frequency range of 8–1 kHz was used to build 3D maps of sound levels throughout all areas relevant to the seismic survey. The CMST SEL modelling results were integrated with other airgun array and SEL modelling pursued by PGS, and represent part of a broader environmental management strategy by PGS. Discussion is also given to other variants of SEL modelling.

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

U.S. Federal Aviation Administration Neighborhood Environmental Survey: Study Motivation and Results

2021 ◽  
Vol 263 (1) ◽  
pp. 5815-5827
Author(s):  
Sean Doyle ◽  
Donald Scata ◽  
James Hileman
Keyword(s):  
Noise Exposure ◽  
Survey Methodology ◽  
Research Effort ◽  
Research Priorities ◽  
Federal Aviation Administration ◽  
The United States ◽  
Aircraft Noise ◽  
Survey Study ◽  
Environmental Survey ◽  
Additional Information

As part of the agency's broader noise research program, the Federal Aviation Administration (FAA) has undertaken a multi-year research effort to quantify the impacts of aircraft noise exposure on communities around commercial service airports in the United States (U.S.). The overall goal of the study was to produce an updated and nationally representative civil aircraft dose-response curve; providing the relationship between annoyance and aircraft noise exposure around U.S. airport communities. To meet this goal, the FAA sponsored a research team to help design and conduct a national survey, known as the Neighborhood Environmental Survey (NES). By assessing the results of the NES through both internal review and input from public comment, the FAA seeks to better inform its noise research priorities and noise policies. This paper will outline the FAA's motivation to conduct the NES as well as how its findings will help inform ongoing work to address aircraft noise concerns. Additional information describing the noise methodology and survey methodology are provided in companion papers.

scholarly journals Optimizing Protective Clothing Design for Hot Outdoor Environments

2013 ◽  
Vol 10 ◽  
pp. 89-92
Author(s):  
Uwe Reischl ◽  
Gang Sun ◽  
Qazaleh Bahramian ◽  
Zhu Qing Xue
Keyword(s):  
Radiation Exposure ◽  
Evaluation Method ◽  
Heat Insulation ◽  
Design Tool ◽  
Heat Radiation ◽  
Thermal Manikin ◽  
Exposure Level ◽  
Clothing Design ◽  
Outdoor Environments ◽  
Transfer Properties

Thermal manikin tests were performed on selected protective garments to assess their heat transfer properties during exposure to infrared heat radiation. Comparing a newly developed Infrared (IR) Heat Radiation attenuatuion vest with a standard winter jacket, it could be seen that that the IR Vest provided a thermal comfort benefit above a heat radiation exposure level of 150 Watts while the winter jacket provided a thermal benefit above a 450 Watt heat radiation exposure level. The study identified important temperature cross-over points which define the thermodynamic properties and also characterize the heat radiation attenuation and heat insulation properties of garments. The evaluation method is seen as a new design tool for optimizing garment comfort and safety.

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.

US Federal Aviation Administration Neighborhood Environmental Survey: Study Design and Survey Methodology

2021 ◽  
Vol 263 (1) ◽  
pp. 5804-5814
Author(s):  
Eric Jodts ◽  
Jean Opsomer
Keyword(s):  
Dose Response ◽  
Response Curve ◽  
Noise Exposure ◽  
Telephone Interview ◽  
Mail Survey ◽  
Federal Aviation Administration ◽  
Aircraft Noise ◽  
Dose Response Curve ◽  
Mail Questionnaire

As part of the agency's broader noise research program, the Federal Aviation Administration (FAA) has undertaken a multi-year research effort to quantify the impacts of aircraft noise exposure on communities around commercial service airports in the United States (U.S.). The overall goal of the study was to produce an updated and nationally representative civil aircraft dose-response curve; providing the relationship between annoyance and aircraft noise exposure around U.S. airport communities. To meet this goal, the FAA sponsored a research team to help design and conduct a national survey, known as the Neighborhood Environmental Survey (NES). Residents from households around 20 airports were selected for participation in the survey; the detailed sampling process is covered in another paper. Two survey instruments were administered to adult residents within the NES: a mail questionnaire and a follow-up telephone interview for the mail respondents. The mail survey was administered to samples of individuals in the selected airport communities in six separate "waves" over a 12-month period starting in October 2015. All mail survey respondents were invited to complete a follow-up telephone interview, which asked detailed questions on several areas including respondents' opinions on noise, exposure to aircraft noise, relationship to the airport, concerns about aircraft operations, views on airport community relations, among others. Analysis of the survey responses on annoyance levels and the associated DNL was used to estimate dose-response curves for each individual airport and a national dose-response curve. The national dose-response curve created from the mail questionnaire shows considerably more people are highly annoyed by aircraft noise at a given noise exposure level compared to historical FICON data. This paper provides a detailed discussion of the survey design and methodology. Additional information describing the motivation to conduct the NES and how its findings will help inform ongoing work to address aircraft noise concerns; and the noise methodology are provided in companion papers.

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