scholarly journals The ground effect in terms of A-weighted sound exposure level.

1991 ◽  
Vol 12 (1) ◽  
pp. 13-17
Author(s):  
J. Jarzecki ◽  
R. Makarewicz
Keyword(s):  
Ground Effect ◽  
Exposure Level ◽  
Sound Exposure

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.

scholarly journals Sound exposure level as a metric for analyzing and managing underwater soundscapes

2019 ◽  
Vol 146 (1) ◽  
pp. 135-149 ◽  
Author(s):  
S. Bruce Martin ◽  
Corey Morris ◽  
Koen Bröker ◽  
Caitlin O'Neill
Keyword(s):  
Exposure Level ◽  
Sound Exposure

Passive Acoustic Observations in the Shallow Waters of Northwest Bay of Bengal to Study the Effects of Impact Pile Driving on Fish Chorus

2017 ◽  
Vol 51 (1) ◽  
pp. 23-31 ◽  
Author(s):  
Madan Mohan Mahanty ◽  
G. Latha ◽  
M. C. Sanjana ◽  
A. Thirunavukarasu
Keyword(s):  
Bay Of Bengal ◽  
Pile Driving ◽  
Exposure Level ◽  
Data Sets ◽  
Sound Exposure ◽  
Spectral Peaks ◽  
Lower Frequency Band ◽  
Few Data ◽  
Passive Acoustic ◽  
The Impact

AbstractAmbient noise time series measurements were recorded in the shallow water of Northwest Bay of Bengal. A few data sets revealed the presence of impact pile-driving noise. The site is also known for the presence of the species Terapon theraps (Family:Terapontidae), and the fish chorus was recorded during the measurement period. Sound metrics of impact pile-driving noise were calculated to assess their potential impacts on fish chorus. Averaged peak sound pressure level reached 162 dB re 1 μPa, and single-strike sound exposure level is about 134 dB re 1 μPa2 s, leading to a cumulative sound exposure level of approximately 148 dB re 1 μPa2 s. The impact pile-driving signal has the highest energy in lower frequency band over 0.05‐1 kHz. It is observed that T. theraps fish chorus also displays their pulse repetition rate and swimbladder spectral peaks at lower frequencies. Detailed analysis of the entire data sets indicates that the fishes were exposed to the pile-driving noise, which would have an impact on the chorus made by them.

Sign in / Sign up

Export Citation Format

Share Document