Marine Mammals and Low-frequency Sound: Progress Since 1994

2001 ◽  
Vol 110 (2) ◽  
pp. 649-650 ◽  
Author(s):  
◽  
James F. Lynch
Keyword(s):  
Marine Mammals ◽  
Low Frequency ◽  
Frequency Sound

Effects of low‐frequency sound (ATOC) on marine mammals: An experimental approach

1995 ◽  
Vol 97 (5) ◽  
pp. 3352-3352
Author(s):  
Daniel P. Costa ◽  
Dawn Goley ◽  
Danielle Waples ◽  
Don Croll ◽  
Burney Le Boeuf ◽  
...  
Keyword(s):  
Marine Mammals ◽  
Experimental Approach ◽  
Low Frequency ◽  
Frequency Sound

Radiated Sound From a Cross-Flow Turbine With Pitching Hydrofoils

2017 ◽  
Author(s):  
Michael Jonson ◽  
Rhett Jefferies ◽  
Margalit Goldschmidt ◽  
Jarlath McEntee
Keyword(s):  
Marine Mammals ◽  
Cross Flow ◽  
Low Frequency ◽  
Load Cell ◽  
Sound Power ◽  
Frequency Sound ◽  
Radiated Sound ◽  
Lift And Drag ◽  
Thrust And Torque ◽  
Cavitating Hydrofoil

An underwater drone turbine generator unit is currently under development. The turbine consists of three cross-flow pitching foils. While understanding single turbine lift, thrust, and torque performance in a reverberant tank with a six-component load cell, an opportunity arose to quantify its radiated sound performance since such information may have an environmental impact on marine mammals and fish. Unsteady lift and drag on a non-cavitating hydrofoil, quantified by the time-dependent load cell response, results in dipole sound. This radiated sound power within the reverberant tank also results in a uniform distribution acoustic pressure that can be measured with hydrophones. Given the tank properties such as volume and frequency dependent reverberation time constants, the radiated sound can be quantified. The low frequency sound power is therefore quantified using the load cell and the high frequency sound power by averaging hydrophone levels. The sound power for the two frequency ranges with excellent overlap are shown for a single turbine with a span of 900 mm and diameter of 450 mm operating at 107 rpm.

Potential Effects of Low Frequency Sounds on Distribution and Behavior of Marine Mammals

2000 ◽  
Author(s):  
Christopher W. Clark ◽  
Daniel P. Costa ◽  
Walter H. Munk
Keyword(s):  
Marine Mammals ◽  
Low Frequency ◽  
And Behavior

scholarly journals Study on broadband low-frequency sound insulation of multi-channel resonator acoustic metamaterials

AIP Advances ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 045321
Author(s):  
Chi Xu ◽  
Hui Guo ◽  
Yinghang Chen ◽  
Xiaori Dong ◽  
Hongling Ye ◽  
...  
Keyword(s):  
Low Frequency ◽  
Sound Insulation ◽  
Acoustic Metamaterials ◽  
Frequency Sound

Wideband low-frequency sound absorption by inhomogeneous multi-layer resonators with extended necks

2021 ◽  
pp. 113538
Author(s):  
Jingwen Guo ◽  
Xin Zhang ◽  
Yi Fang ◽  
Ziyan Jiang
Keyword(s):  
Sound Absorption ◽  
Low Frequency ◽  
Frequency Sound
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