Estimation of surface noise source level from low‐frequency seismoacoustic ambient noise measurements

1987 ◽  
Vol 82 (S1) ◽  
pp. S62-S63
Author(s):  
Henrik Schmidt ◽  
W. A. Kuperman
Keyword(s):  
Ambient Noise ◽  
Noise Source ◽  
Low Frequency ◽  
Noise Measurements ◽  
Source Level ◽  
Surface Noise

scholarly journals Estimation of the Noise Source Level of a Commercial Ship Using On-Board Pressure Sensors

2021 ◽  
Vol 11 (3) ◽  
pp. 1243
Author(s):  
Hongseok Jeong ◽  
Jeung-Hoon Lee ◽  
Yong-Hyun Kim ◽  
Hanshin Seol
Keyword(s):  
Noise Source ◽  
Pressure Sensors ◽  
Low Frequency ◽  
Frequency Resolution ◽  
Source Strength ◽  
Recording Time ◽  
Source Level ◽  
The One ◽  
Hydrophone Array ◽  
Good Agreement

The dominant underwater noise source of a ship is known to be propeller cavitation. Recently, attempts have been made to quantify the source strength using on-board pressure sensors near the propeller, as this has advantages over conventional noise measurement. In this study, a beamforming method was used to estimate the source strength of a cavitating propeller. The method was validated against a model-scale measurement in a cavitation tunnel, which showed good agreement between the measured and estimated source levels. The method was also applied to a full-scale measurement, in which the source level was measured using an external hydrophone array. The estimated source level using the hull pressure sensors showed good agreement with the measured one above 400 Hz, which shows potential for noise monitoring using on-board sensors. A parametric study was carried out to check the practicality of the method. From the results, it was shown that a sufficient recording time is required to obtain a consistent level at high frequencies. Changing the frequency resolution had little effect on the result, as long as enough data were provided for the one-third octave band conversion. The number of sensors affected the mid- to low-frequency data.

A Method for Noise Source Levels Inversion with Underwater Ambient Noise Generated by Typhoon in Deep Ocean

2018 ◽  
Vol 26 (02) ◽  
pp. 1850007 ◽  
Author(s):  
Qiulong Yang ◽  
Kunde Yang ◽  
Shunli Duan
Keyword(s):  
Ambient Noise ◽  
Noise Source ◽  
Surface Wind ◽  
Deep Ocean ◽  
Noise Sources ◽  
Noise Field ◽  
Sea Surface Wind ◽  
Source Level ◽  
The Western Pacific ◽  
Good Agreement

Sea-surface wind agitation can be considered the dominant noise sources whose intensity relies on local wind speed during typhoon period. Noise source levels in previous researches may be unappreciated for all oceanic regions and should be corrected for modeling typhoon-generated ambient noise fields in deep ocean. This work describes the inversion of wind-driven noise source level based on a noise field model and experimental measurements, and the verification of the inverted noise source levels with experimental results during typhoon period. A method based on ray approach is presented for modeling underwater ambient noise fields generated by typhoons in deep ocean. Besides, acoustic field reciprocity is utilized to decrease the calculation amount in modeling ambient noise field. What is more, the depth dependence and the vertical directionality of noise field based on the modeling method and the Holland typhoon model are evaluated and analyzed in deep ocean. Furthermore, typhoons named “Soulik” in 2013 and “Nida” in 2016 passed by the receivers deployed in the western Pacific (WP) and the South China Sea (SCS). Variations in sound speed profile, bathymetry, and the related oceanic meteorological parameters are analyzed and taken into consideration for modeling noise field. Boundary constraint simulated annealing (SA) method is utilized to invert the three parameters of noise source levels and to minimize the objective function value. The prediction results with the inverted noise source levels exhibit good agreement with the measured experiment data and are compared with predicted results with other noise sources levels derived in previous researches.

An analysis of low‐frequency wind‐generated ambient noise source levels in the ocean

1988 ◽  
Vol 83 (S1) ◽  
pp. S87-S87
Author(s):  
W. M. Carey ◽  
D. J. Kewley ◽  
D. G. Browning ◽  
W. A. Von Winkle
Keyword(s):  
Ambient Noise ◽  
Noise Source ◽  
Low Frequency

Wind‐generated, low‐frequency, ambient‐noise source levels revisited

1999 ◽  
Vol 106 (4) ◽  
pp. 2297-2297
Author(s):  
William M. Carey ◽  
David G. Browning
Keyword(s):  
Ambient Noise ◽  
Noise Source ◽  
Low Frequency

Low‐frequency wind‐generated ambient noise source levels

1990 ◽  
Vol 88 (4) ◽  
pp. 1894-1902 ◽  
Author(s):  
D. J. Kewley ◽  
D. G. Browning ◽  
W. M. Carey
Keyword(s):  
Ambient Noise ◽  
Noise Source ◽  
Low Frequency

Low-frequency ambient-noise measurements in the South Fiji basin

1990 ◽  
Vol 15 (4) ◽  
pp. 311-315 ◽  
Author(s):  
R. Marrett ◽  
N.R. Chapman
Keyword(s):  
Ambient Noise ◽  
Low Frequency ◽  
The South ◽  
Noise Measurements

scholarly journals Review of Research Results Concerning the Modelling of Shipping Noise

2021 ◽  
Vol 28 (2) ◽  
pp. 102-115
Author(s):  
Xiaowei Yan ◽  
Hao Song ◽  
Zilong Peng ◽  
Huimin Kong ◽  
Yipeng Cheng ◽  
...  
Keyword(s):  
Ambient Noise ◽  
Noise Source ◽  
Low Frequency ◽  
Empirical Models ◽  
Academic Community ◽  
Marine Ecology ◽  
Related Research ◽  
Research Results ◽  
Radiated Noise ◽  
Underwater Radiated Noise

Abstract The effect of underwater radiated noise (URN) pollution (produced by merchant ships) on marine ecology has become a topic of extreme concern for both the academic community and the general public. This paper summarises some research results and modelling about shipping noise published over several decades, which comprises the research significance of low-frequency ambient noise and shipping noise, shipping noise source levels (SL), empirical models and the measurement standards of shipping noise. In short, we try to present an overall outline of shipping noise and ocean ambient noise for related research.

A standard definition for wind‐generated, low‐frequency ambient noise source levels

1988 ◽  
Vol 84 (S1) ◽  
pp. S201-S201
Author(s):  
William M. Carey ◽  
William A. VonWinkle ◽  
David G. Browning ◽  
Douglas J. Kewley
Keyword(s):  
Ambient Noise ◽  
Noise Source ◽  
Low Frequency ◽  
Standard Definition
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