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Virginia Tech partners with Dive Technologies to launch autonomous underwater vehicle

July 7, 2020 by David Edwards Leave a Comment

Virginia Tech researchers at the Center for Marine Autonomy and Robotics have partnered with Boston-based Dive Technologies to support the development and testing of what they describe as a novel autonomous underwater vehicle with innovative vehicle design and state-of-the-art control, software, and autonomy systems.

This multiyear collaboration provides an opportunity to apply research discoveries and innovative technology developed in the academic lab and deploy them in next-generation commercial applications.

Bill Lebo, co-founder and chief technology officer of Dive Technologies, says: “We feel fortunate to be working closely with professors Daniel Stilwell, Stefano Brizzolara, and the entire team supporting Dive Technologies from the Center for Marine Autonomy and Robotics.

“Leveraging the expertise of the Virginia Tech team really drove our autonomous underwater vehicle design forward in a uniquely innovative way and has created immense efficiency in our development schedule. Our partnership with Virginia Tech has pushed our team creatively and demonstrates the exceptional value of academic partnerships.”

Brandy Salmon, Virginia Tech’s associate vice president for innovation and partnerships, says: “The structure of this partnership is so inspiring and embodies everything we’re working to enable through the Link License Launch discovery to market team.

“Through a sponsored research agreement and customized license, Dive Technologies and Virginia Tech are collaborating to develop cutting-edge autonomous underwater vehicle technologies.

“This gives Dive the opportunity to further commercialize, manufacture, and scale their innovative AUV platform.

“This end-to-end approach creates value on both sides and ensures technologies developed at the university deliver societal and economic impact. We look forward to supporting our researchers and Dive as the work advances.”

Autonomous underwater vehicles are self-propelled, unmanned, untethered underwater vehicles capable of carrying out simple activities with little or no human supervision.

Dive Technologies, a subsea robotics designer and manufacturer, partnered with the Center for Marine Autonomy and Robotics to leverage their expertise in innovative vehicle design, as well as state-of-the-art control, software, and autonomy systems.

The interdisciplinary research team at Virginia Tech is led by Daniel Stilwell, professor in the Bradley Department of Electrical and Computer Engineering, and Stefano Brizzolara, associate professor in the Kevin Crofton Department of Aerospace and Ocean Engineering.

Together with their team of graduate students, they are combining years of research and expertise in marine hydrodynamics and propulsion, with state-of-the-art autonomous control systems and software.

Stilwell says: “Dive Technologies came to us with a specific set of requirements for their unmanned underwater vehicle, which will perform deep ocean surveys and data collection.

“As one of the only places in the country that is comprehensively studying autonomous underwater vehicles, Virginia Tech is helping them leap ahead in terms of technology.”

Stilwell’s team is providing all of the vehicle’s software, which includes the autopilot, autonomy functions, and a graphical user-interface that the operator uses to program a mission.

Stillwell says: “The software we are providing has been largely vetted here at Virginia Tech on our own unmanned underwater vehicles.

“This work has the potential to advance the industry in terms of the capabilities of underwater vehicles.”

Brizzolara and his team have been working on improving the vehicle design to enable long endurance missions.

Through computational modeling and sophisticated hydrodynamic studies, they are collaborating with Dive Technologies to develop an innovative design that helps reduce drag and improve the propulsion efficiency of the vehicle.

With a more efficient design, the vehicle is more maneuverable and has the ability to cover longer distances.

Specifically, Brizzolara and his team are exploring innovative solutions to minimize the drag of the hull at cruise and survey speeds.

Brizzolara says: “Using high fidelity computational fluid dynamic models able to accurately model the transition between laminar and turbulent flow, we are able to resolve the steady and unsteady flow around the vehicle.

“This includes the propellers and fixed and movable appendages for motion control. Virtual model tests, based on the numerical models, are then used within design optimization algorithms to find the best combination of hull and appendages geometry as well as propulsion system, often resulting in novel shapes and configurations.”

Brizzolara initiated this type of innovative design-oriented research more than 15 years ago, which has generated a number of interesting new concepts of marine vehicles and systems.

These findings have been documented in over 200 publications and nine patented technologies, and include such successes as a medium-sized autonomous surface vessel whose top speed is 130 knots at up to sea state three and can safely navigate in higher sea state at reduced speed, and a new type of hydrofoil-assisted, high-speed planing hull that reduces the drag of conventional planing crafts by more than 30 percent.

Brizzolara says: “In the case of Dive Technologies’ vehicle, these novel design paradigms have led to an increase in the maneuvering abilities, through specific design choices based on a novel, high-fidelity maneuvering model and a particular design of the hull shape with compliant surfaces, which guarantees a very low drag coefficient.”

The research team has also provided a custom design for the vehicle’s propulsion and investigated the best size and location placement of the propeller in the stern of the vehicle.

Brizzolara says: “Optimizing propeller design to account for proper hull interaction and allowing for a change not only in propeller diameter but also longitudinal position behind a vehicle is a novel concept, which has shown significant improvements of the overall propulsion efficiency.”

The first prototype of the large displacement unmanned underwater vehicle, which measures about 18 feet long, is currently under construction at Dive Technologies and is on schedule for sea testing this summer.

The team at Virginia Tech will continue to work for another two years and use the test data to continually improve the control systems and the hydrodynamic design and refine the propulsion systems.

The research team includes doctoral candidates Cong Chen, Saksham Gupta, and Stephen Krauss of the Bradley Department of Electrical and Computer Engineering, and doctoral candidates Lakshmi Miller and Taylor Njaka of the Kevin Crofton Department of Aerospace and Ocean Engineering.

According to Stilwell, while the students each come from very different academic backgrounds, they come together as a team to do amazing things. They occupy the same workspace, learn from each others’ problems, and tackle research challenges together.

Stilwell says: “They are able to take their dissertation ideas and put them into practice.

“Through this partnership, the students have the opportunity to actually commercialize their research, which results in a really unique learning experience.”

The Center for Marine Autonomy and Robotics at Virginia Tech is an interdisciplinary organization that spans multiple academic departments. The center conducts research for a diverse set of government and commercial sponsors and provides unique cross-disciplinary training for students and postdoctoral scholars.

The center’s research expertise encompasses novel vehicle design, fundamental advances in autonomy, and the practical art of deploying advanced vehicle systems in the field.

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Filed Under: Industry, News Tagged With: autonomous, autonomy, brizzolara, center, design, dive, innovative, marine, novel, propulsion, robotics, stilwell, systems, team, tech, technologies, underwater, vehicle, vehicles, virginia

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