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A study on the asymmetric cylinder wall thickness difference discrimination by dolphins
Wen Feng1, Yu Zhang1, Chong Wei2
1Key Laboratory of Underwater Acoustic Communication and Marine Information Technology of the Ministry of Education, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, People's Republic of China.
The Journal of the Acoustical Society of America
|September 6, 2018
Summary
Atlantic bottlenose dolphins discriminate underwater targets by analyzing acoustic echoes. A new model reveals asymmetric echo shifts, potentially caused by Lamb waves, explaining dolphin discrimination abilities.
Area of Science:
- Acoustics
- Bioacoustics
- Biomimetic Intelligence
Background:
- Atlantic bottlenose dolphins exhibit sophisticated acoustic discrimination abilities.
- Dolphin performance in discriminating target thickness is asymmetric.
- Existing models do not fully explain this observed asymmetry.
Purpose of the Study:
- To develop a finite element model simulating dolphin acoustic target discrimination.
- To investigate the physical mechanisms behind asymmetric echo discrimination by dolphins.
- To explore the role of Lamb waves in acoustic signal processing.
Main Methods:
- Finite element modeling of acoustic echoes from cylinders with varying wall thicknesses.
- Comparison of simulated echo waveforms and spectra with experimental data.
- Analysis using geometric acoustics and wave acoustics principles.
Main Results:
- Model simulations accurately replicated previous experimental findings.
- Asymmetric arrival time shifts in echo peaks and troughs were observed.
- Lamb waves were identified as a potential source of the observed discrimination asymmetry.
Conclusions:
- The study provides a physical explanation for asymmetric dolphin acoustic discrimination.
- Lamb waves play a crucial role in underwater target discrimination.
- Findings support the development of biomimetic intelligence for signal processing.
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