Sound exposure level and energy spectral density of underwater explosions in shallow water over a coral substrate off the southern coast of O`ahu, Hawai`i

2016 ◽  
Vol 140 (4) ◽  
pp. 3171-3171
Author(s):  
Alexander G. Soloway ◽  
Peter H. Dahl ◽  
Lee H. Shannon
Keyword(s):  
Spectral Density ◽  
Shallow Water ◽  
Exposure Level ◽  
Southern Coast ◽  
Underwater Explosions ◽  
Sound Exposure ◽  
Energy Spectral Density

White noise wave generation method controlled by a rotary valve

2020 ◽  
pp. 107754632097480
Author(s):  
Yi Liu ◽  
De-xin Chen ◽  
Heng Jin ◽  
Tao Wang
Keyword(s):  
Theoretical Model ◽  
Spectral Density ◽  
White Noise ◽  
Transmission Function ◽  
Wave Generation ◽  
Control Parameters ◽  
Rotary Valve ◽  
Variable Amplitude ◽  
Energy Spectral Density ◽  
Marine Engineering

To meet the demands of white noise waves with different and higher energy spectral density, a new white noise wave generation method was proposed and a corresponding wave-making system controlled by a rotary valve was developed. The theoretical model of the new method was established, and the hydraulic transmission function of the wave-making system was solved. After the control parameters of the white noise waves in the wave-making system were obtained, the experiment tests were carried out to generate the white noise waves, and its energy spectral density was analyzed by Fourier analysis. The results show that white noise waves with different amplitudes have different energy spectral densities. And the energy spectral density of the generated waves is approximately a constant. Therefore, the present white noise wave generation method is feasible in marine engineering tests, and the wave with variable amplitude and higher energy spectral density can be generated.

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.

A new framework using deep auto-encoder and energy spectral density for medical waveform data classification and processing

2019 ◽  
Vol 39 (1) ◽  
pp. 148-159 ◽  
Author(s):  
Ahmad M. Karim ◽  
Mehmet S. Güzel ◽  
Mehmet R. Tolun ◽  
Hilal Kaya ◽  
Fatih V. Çelebi
Keyword(s):  
Spectral Density ◽  
Data Classification ◽  
Waveform Data ◽  
Energy Spectral Density ◽  
Medical Waveform ◽  
New Framework

Spectral Wave Modeling in Very Shallow Water at Southern Coast of Caspian Sea

2018 ◽  
Vol 17 (1) ◽  
pp. 140-151
Author(s):  
Seyed Masoud Mahmoudof ◽  
Peyman Badiei ◽  
Seyed Mostafa Siadatmousavi ◽  
Vahid Chegini
Keyword(s):  
Shallow Water ◽  
Caspian Sea ◽  
Southern Coast ◽  
Wave Modeling

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
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