An acoustic signal propagation experiment beneath sea ice

2012 ◽  
Vol 43 ◽  
pp. 56-63 ◽  
Author(s):  
Ron S. Lewis ◽  
Michèle Drogou ◽  
Peter King ◽  
George Mann ◽  
Neil Bose ◽  
...  
Keyword(s):  
Sea Ice ◽  
Acoustic Signal ◽  
Signal Propagation ◽  
Propagation Experiment

Modeling RF and acoustic signal propagation in complex environments

2018 ◽  
Author(s):  
D. Keith Wilson ◽  
Daniel J. Breton ◽  
Wesley M. Barnes ◽  
Michael B. Muhlestein ◽  
Vladimir E. Ostashev ◽  
...  
Keyword(s):  
Acoustic Signal ◽  
Signal Propagation ◽  
Complex Environments

scholarly journals Researches on very low frequency acoustic signal propagation characteristics in different shallow elastic wedge bottoms

2019 ◽  
Vol 283 ◽  
pp. 02003
Author(s):  
Jun Zhu ◽  
Hanhao Zhu ◽  
Jun Tang ◽  
Guangxue Zheng
Keyword(s):  
Acoustic Signal ◽  
Low Frequency ◽  
Signal Propagation ◽  
Acoustic Energy ◽  
Propagation Characteristics ◽  
The Finite Element Method ◽  
Very Low Frequency ◽  
Extremely Low Frequency ◽  
Elastic Bottom ◽  
Sloping Bottom

Targeted at the issue of extremely low-frequency (<100Hz) acoustic propagation in complex shallow elastic bottom environments. The influence law of different complex elastic bottoms on the acoustic signal propagation at very low frequency by acoustic energy flux has been analyzed with the simulation, which is based on the finite element method. The elastic bottoms which have been studied are the shallow horizontal elastic bottom, and the up-sloping and the down-sloping elastic bottom. The results show that the acoustic signal propagating in the up-sloping and down-sloping elastic bottom environments is more complex than that propagating in the horizontal elastic bottom, and the acoustic energy leaking into those elastic bottoms has very different influence on the acoustic signal propagation, especially in the up-sloping bottom.

Statistical moments for wideband acoustic signal propagation through a turbulent atmosphere

2014 ◽  
Vol 136 (4) ◽  
pp. 2139-2139
Author(s):  
Jericho E. Cain ◽  
Sandra L. Collier ◽  
Vladimir E. Ostashev ◽  
David K. Wilson
Keyword(s):  
Acoustic Signal ◽  
Turbulent Atmosphere ◽  
Signal Propagation ◽  
Statistical Moments

Study of Acoustic Signal Propagation from Sea to Land

2019 ◽  
Vol 65 (3) ◽  
pp. 279-287
Author(s):  
A. N. Rutenko ◽  
D. S. Manul’chev ◽  
S. B. Kozitskii
Keyword(s):  
Acoustic Signal ◽  
Signal Propagation

scholarly journals Characterization of In-Pipe Acoustic Wave for Water Leak Detection

2011 ◽  
Author(s):  
Atia E. Khalifa ◽  
Rached Ben-Mansour ◽  
Kamal Youcef-Toumi ◽  
Changrak Choi
Keyword(s):  
Acoustic Signal ◽  
Acoustic Waves ◽  
Wave Attenuation ◽  
Signal Propagation ◽  
Optimum Location ◽  
Flow Conditions ◽  
Water Leak ◽  
Flexible Pipes ◽  
Line Pressure

This paper presents experimental observations on the characteristics of the acoustic signal propagation and attenuation inside water-filled pipes. An acoustic source (exciter) is mounted on the internal pipe wall, at a fixed location, and produces a tonal sound to simulate a leak noise with controlled frequency and amplitude, under different flow conditions. A hydrophone is aligned with the pipe centerline and can be re-positioned to capture the acoustic signal at different locations. Results showed that the wave attenuation depends on the source frequency and the line pressure. High frequency signals get attenuated more with increasing distance from the source. The optimum location to place the hydrophone for capturing the acoustic signal is not at the vicinity of source location. The optimum location also depends on the frequency and line pressure. It was also observed that the attenuation of the acoustic waves is higher in more flexible pipes like PVC ones.

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