Volume 124, Number 6, December 2018
|Number of page(s)||7|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||15 January 2019|
Dynamic properties in beam formation of the Indo-Pacific humpback dolphin
1 Key Laboratory of Underwater Acoustic Communication and Marine Information Technology of the Ministry of Education, College of Ocean and Earth Sciences, Xiamen University - Xiamen 361005, Fujian, China
2 Biology Department, Woods Hole Oceanographic Institution - Woods Hole, MA 02543, USA
3 Department of Mechanical Engineering, Massachusetts Institute of Technology - Cambridge, 02139 MA, USA
4 Third Institute of Oceanography, State Oceanic Administration - Xiamen 361005, Fujian, China
Received: 30 August 2018
Accepted: 18 December 2018
In this letter, a numerical head model is inspired from an Indo-Pacific humpback dolphin to investigate its acoustic field and beam patterns. The numerical solutions show a dynamic property of the beam patterns. The beam has a minimum width outside but close to the head. Then it widens before reaching a stable state in far distances. Sound pressure along the axis is the highest around the sound source. Afterwards, it decreases rapidly and fluctuates, reaching a local maximum before sounds spread into water, where the axial pressure amplitude decreases with the increase of distance.
PACS: 43.80.Ka – Sound production by animals: mechanisms, characteristics, populations, biosonar / 43.64.Tk – Physiology of sound generation and detection by animals
© EPLA, 2019
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