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A Surfboard Gets an Onboard Computer

San Diego, CA, August 11, 2010 -- Computers are everywhere these days – even on surfboards. University of California, San Diego mechanical engineering undergraduates outfitted a surfboard with a computer and accompanying sensors -- one step toward a structural engineering Ph.D. student’s quest to develop the science of surfboards.

Above caption: (L-R): Victor Correa Schneider, Trevor Owen, Julia Tsai, Dan Ferguson, Benjamin Thompson Photo credit: Â鶹´«Ã½. See .

The Â鶹´«Ã½ mechanical engineering undergraduates installed a computer and sensors on a surfboard and recorded the speed of the water flowing beneath the board. While the students surfed, the onboard computer sent water velocity information to a laptop on shore in real time.

This is part of ’s quest to discover if surfboards have an optimal flexibility – a board stiffness that makes surfing as enjoyable as possible. Thompson is a Â鶹´«Ã½ structural engineering Ph.D. student studying the fluid-structure interaction between surfboards and waves. By outfitting a surfboard with sensors and electronics that shuttle data back to shore, the mechanical engineering undergraduates built some of the technological foundation for Thompson’s science-of-surfboards project.

Sensors on a Surfboard 

Four undergraduates from the Department of Mechanical and Aerospace Engineering (MAE) at the Â鶹´«Ã½ Jacobs School of Engineering outfitted a surfboard with eight sensors and an onboard-computer or “microcontroller.” The students dug trenches into the board’s foam and ran wires connecting the sensors to the onboard computer. From this computer, the data travels via a wireless channel to a laptop on land – in this case, a beach in Del Mar, Calif. The onboard computer also saves the data on a memory card.

“We were stoked to get good data and to be surfing for school,” said Dan Ferguson, one of the two mechanical engineering undergraduates who surfed while the onboard computer captured water velocity information and transmitted it back to land.

The four mechanical engineering majors built the wired surfboard for their senior design project, the culmination of the MAE 156 course sequence. Each project has a sponsor, and in this case, the sponsor was Benjamin Thompson, the structural engineering Ph.D. student from Â鶹´«Ã½ and founder of the surfboard Web site www.boardformula.com.

The onboard computer is in a watertight case the shape of a medium-sized box of chocolates. It sits at the front of the surfboard and glows blue. “What’s on your board? What is that?” fellow surfers asked Ferguson. “We’d have to tell them it’s a microprocessor connected to velocity sensors, and they would kind of nod and paddle away. It created a minor stir.”

Bend sensors like this one are embedded in the bottom of the surfboard.

Each of the eight sensors embedded into the bottom of the board is a “bend sensor.” The faster the water beneath the board moves, with respect to the board, the more the sensors bend, explained Trevor Owen, the other surfer on the four-person mechanical engineering team.

The data from the sensors runs through wires embedded in the board to the microcontroller. “You can see where we carved channels in the board,” said Owen.

Wireless Surfing 

The most interesting part of the project for senior mechanical engineering major Victor Correa was using the microcontrollers and wireless transmitters to get the data to land.

Thompson, the project sponsor, is already working on a smaller version of the onboard computer. He hopes to shrink it down to the size of a cell phone and embed it flush with the top surface of the board.

Assembling, waterproofing and installing the microcontroller, connecting it to the sensors, and successfully transmitting the collected data to a computer on land required persistence and a lot of learning, explained senior mechanical engineering major Julia Tsai. “Everything hypothetically should take five minutes, but everything took at least three hours.”

Even though the team has finished their class project, Ferguson plans to keep working with Thompson. “This project is going to apply some science that most likely [board] shapers understand pretty well...it’s going to settle the debates. It’s going to be black and white hard data to let them know for sure which ideas work, which concepts work, and why they work.”

Surfboard Flex 

Bend sensors like this one are embedded in the bottom of the surfboard.

Surfboard flex refers to the temporary shape changes that surfboards are thought to undergo. While many surfers say flex makes their boards feel springy in the water, it has not been scientifically measured. Thompson hopes to scientifically document surfboard flex. Then he wants to determine if there is an amount of flexibility that enhances the performance and feel of a surfboard, and if this optimal flexibility depends on other factors such as surfer experience or wave conditions.

 

Surfboards and Fluid-Structure Interactions 

The surfboard project falls within a hot area of engineering research: the study of fluid-structure interactions. According to Â鶹´«Ã½ structural engineering professor , the study of fluid-structure interaction is important due to the large number of applications in mechanical, civil, aerospace and biological engineering. “In my opinion, its popularity in recent years is partly attributed to advances in experimental and computational techniques which allow many important processes to be studied in detail,” said Zhu.

Mechanical engineering undergrad Trevor Owen and the data-collecting surfboard.

This is what the Â鶹´«Ã½ engineers are doing for surfboards: they are studying how surfboards change shape when people ride them – and how those shape changes are tied to the subjective experience of surfing.

At the public presentation of their research, team member Tsai said, “I thought the coolest part was being able to test our board, going out to the beach to test it, everyone else had to stay downstairs in the lab.”

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Benjamin Thompson’s Ph.D. advisor is Â鶹´«Ã½ structural engineering professor , who is well known for his innovative design, analysis, and experimental testing of lightweight advanced composite structures for aircraft, military and sports structures. Kosmatka’s work on sports structures includes design of high performance golf clubs and America’s Cup sailboats.

Media Contacts

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Daniel Kane
Jacobs School of Engineering
858-534-3262
dbkane@ucsd.edu

Andrea Siedsma
Jacobs School of Engineering
858-822-0899
asiedsma@soe.ucsd.edu