Recent Advancements in Research and Commercialization of Tethered Encapsulated Bubbles for Low-Frequency Underwater Noise Abatement

date February 1, 2013
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Friday, February 1, 2013 4:00 p.m. in ETC 4.150

Dr. Kevin M. Lee
Applied Research Laboratories
The University of Texas at Austin
Dr. Mark S. Wochner
AdBm Technologies, LLC

Arrays of large encapsulated bubbles have been shown to be very effective at reducing underwater sound radiated from various sources.  These arrays provide noise reduction using the combined effects of bubble resonance attenuation and acoustic impedance mismatching and have been used to treat both sources of noise and to protect receiving areas from external noise. Recent research efforts at UT concerning the acoustics of large encapsulated bubbles and their use in reducing underwater noise will be presented.  Measurements of encapsulated bubble resonance frequencies and attenuation were made and compared with various bubbly liquid effective medium models for the purpose of determining which models are best suited for designing future systems.  Additionally, experiments were conducted in which encapsulated bubble arrays were used to reduce underwater noise from both continuous and impulsive noise sources. The research has also resulted in a UT spin-off company, AdBm Technologies, which was formed in 2012 and is currently commercializing the technology as well as sponsoring UT research aimed at developing prototype noise abatement systems. The process of technology commercialization at UT and the transition from idea to salable product will be detailed.