Acoustic Cavitation Localization in Reverberant Environments
Open Access
- Author:
- Anderson, Samuel Jesse
- Graduate Program:
- Acoustics
- Degree:
- Master of Science
- Document Type:
- Master Thesis
- Date of Defense:
- November 02, 2012
- Committee Members:
- Dean Capone, Thesis Advisor/Co-Advisor
William Kris Bonness, Thesis Advisor/Co-Advisor
David Marion Jenkins Jr., Thesis Advisor/Co-Advisor
Robert Lee Campbell, Thesis Advisor/Co-Advisor
Richard Lee Culver, Thesis Advisor/Co-Advisor - Keywords:
- Cavitation
acoustic
bubble
reverberant
localization
underwater - Abstract:
- Cavitation detection and localization techniques generally require visual access to the fluid fi eld, multiple high-speed cameras, and appropriate illumination to locate cavitation. This can be costly and is not always suitable for all test environments, particularly when the bubble diameter is small or duration is short. Acoustic detection and localization of cavitation can be more robust and more easily implemented, without requiring visual access to the site in question. This research utilizes the distinct acoustic signature of cavitation events to both detect and localize cavitation during experimental water tunnel testing. Using 22 hydrophones and the processing techniques straight-ray Monte Carlo processing, plane-wave beamforming and Matched-Field Processing (MFP), cavitation is accurately and quickly localized during testing in a twelve-inch diameter water tunnel. Cavitation is induced using a Nd:YAG laser for precise control of bubble location and repeatability. Accounting for and overcoming the eff ects of reflections on acoustic localization in acoustically small environments is paramount in water tunnels, and the techniques employed to minimize error will be discussed.