Timothy Havens, the William and Gloria Jackson Associate Professor of Computer Systems, has co-authored a paper recently published in The Journal of the Acoustical Society of America, Volume 50, Issue 1.
The paper is titled, “Recurrent networks for direction-of-arrival identification of an acoustic source in a shallow water channel using a vector sensor.” Havens’s co-authors are Steven Whitaker (EE graduate student), Andrew Barnard (ME-EM/GLRC), and George D, Anderson, US Naval Undersea Warfare Center (NUWC)-Newport.
The work described in the paper was funded by the United States Naval Undersea Warfare Center and Naval Engineering Education Consortium (NEEC) (Grant No. N00174-19-1-0004) and the Office of Naval Research (ONR) (Grant No. N00014-20-1-2793). This is Contribution No. 76 of the Great Lakes Research Center at Michigan Technological University.
Conventional direction-of-arrival (DOA) estimation algorithms for shallow water environments usually contain high amounts of error due to the presence of many acoustic reflective surfaces and scattering fields. Utilizing data from a single acoustic vector sensor, the magnitude and DOA of an acoustic signature can be estimated; as such, DOA algorithms are used to reduce the error in these estimations.
Three experiments were conducted using a moving boat as an acoustic target in a waterway in Houghton, Michigan. The shallow and narrow waterway is a complex and non-linear environment for DOA estimation. This paper compares minimizing DOA errors using conventional and machine learning algorithms. The conventional algorithm uses frequency-masking averaging, and the machine learning algorithms incorporate two recurrent neural network architectures, one shallow and one deep network.
Results show that the deep neural network models the shallow water environment better than the shallow neural network, and both networks are superior in performance to the frequency-masking average method.
Michigan Tech is among 17 top colleges and universities nationwide that have been selected to compete in the 2021-22 Marine Energy Collegiate Competition: Powering the Blue Economy The event is hosted by the U.S. Department of Energy’s (DOE) Office of Energy Efficiency and Renewable Energy (EERE).
These student competitors are poised to be the next blue economy innovators as they gain real-world experience and make industry connections to prepare for future careers in marine energy, according to the Marine Energy Collegiate Competition.
Administered by the National Renewable Energy Laboratory, on behalf of EERE’s Water Power Technologies Office, the competition challenges interdisciplinary teams of undergraduate and graduate students to explore opportunities for marine energy technologies via real-world concept development experiences, and to propose unique solutions to the burgeoning marine energy industry.
Submissions can run the gamut from concepts that aid in ocean observation and underwater vehicle charging to desalination and more, including—but not limited to—the markets identified in DOE’s Powering the Blue Economy™ report.
The DOE is hosting the challenge to advance one of the most up-and-coming industries: marine energy. Marine energy has the potential to provide reliable power to the blue economy, but further work is needed to optimize designs and reduce costs, according to the competition website.
The “blue economy” describes the sustainable use of ocean resources for economic growth, improved livelihoods and jobs, and ocean ecosystem health.
- Develop a market-research-supported business plan, which will include key aspects of their design of a system that could be commercialized to address power needs for a chosen sector of the blue economy
- Pitch their plan to a panel of judges and hypothetical investors
- Have the option to build and test a device to achieve energy production
- Engage with their community through outreach and educational activities.
- A 20- to 30-page market research-supported business plan and technical design of a marketable device powering any marine energy sector of the blue economy
- A 20-minute public pitch that will be presented to a panel of judges during the competition event at Water Power Week 2022 or virtual followed by a 15-minute Q&A session
- 5 minutes of the public pitch will focus on community engagement and outreach activities the team conducted throughout the year
- A poster summarizing the entire technical and business plan
- Optional: An effective prototype that will be tested for power performance at model scale. Results of the test will be summarized in the written report.
Inspiring Blue Economy Ingenuity
“The MECC provides an opportunity for a diversity of experience, education, and perspectives in exploring the possibilities of the blue economy,” said Arielle Cardinal, the MECC operations manager at NREL. “We’re excited to support the 2022 competitors in bringing new ideas and innovations to the forefront of marine energy.”