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- Title
A Method for Extracting Dynamic Vortex Acoustic Signal Characteristics in Island and Reef Channels Based on Time-Reversal Mirrors.
- Authors
Yu, Min; Liu, Hang; Zhou, Wei; Fan, Dingfan
- Abstract
Ships navigating in channels with vortex fields face increased risks. However, these vortex fields can be monitored using acoustic methods. The key is to extract the phase characteristics of sound signals passing through the vortices. Using time-reversal mirrors, this paper studied the extraction method of characteristics both numerically and experimentally, aiming to verify the effectiveness of the numerical simulation method. Starting from this point, the impact of different movement forms and scale changes in vortex fields on the acoustic signal extraction method was further investigated. The results indicate that with the iterations of time reversal (N < 6), the method is effective for uniformly moving vortex fields, when the vortex center moving speed V w < 2.2 × 10−3 m/s and the radius diffusion speed V r < 2.5 × 10−3 m/s. On the other hand, for oscillating vortex fields, it is effective when the oscillation amplitude L D < 0.15 m and the radius diffusion speed V r < 2.4 × 10−3 m/s; meanwhile, the dynamic characteristics of the vortex field can be ignored by the phase extraction method based on time-reversal mirrors.
- Subjects
TIME reversal; ACOUSTIC field; COMPUTER simulation; MIRRORS; REEFS
- Publication
Applied Sciences (2076-3417), 2024, Vol 14, Issue 16, p7042
- ISSN
2076-3417
- Publication type
Article
- DOI
10.3390/app14167042