September 17, 2009
Engineering Students Build Underwater ‘Bot
Long Beach City College's Ian Jasper tells what it's like to be a member of a student team participating in an international remotely operated vehicle competition
Remotely operated vehicles, or ROVs, are underwater robots that can go where the environment is too deep or difficult for human divers. I learned how to design and build ROVs as a student in the electrical department at Long Beach City College (LBCC) where, every year, students enrolled in the department's robotics class form a team that competes in the Marine Advanced Technology Education (MATE) Center's International Student ROV Competition.
The MATE competition is a pool-based competition that uses props to simulate realistic underwater workplaces. The MATE Center is one of 37 Advanced Technological Education (ATE) Centers established with funding from the National Science Foundation's (NSF) ATE Program.
LBCC's team, along with student teams from all over the world, compete with ROVs that we design and build to meet contest guidelines. I've been the team's captain for the last three years.
Teams compete in either the Ranger or Explorer class, depending on the sophistication of the ROVs. Our team competes in the Explorer class, which uses higher voltage in the ROVs' power supply. This year, the teams were tasked with designing and building ROVs to function as submarine rescue systems. The missions included inspecting the simulated submarine for damage, delivering emergency supplies and replenishing the onboard air supply. The mission specifications described how the simulated submarines--built out of milk crates, PVC and other everyday materials--would be constructed and positioned at the bottom of the pool.
Initially, our team learned as much as we could about ROVs used in real-world submarine rescue and recovery missions so that we could develop a realistic vehicle. We used computer-aided design (CAD) software to develop vehicle designs, starting out with about 10 different design ideas. We eliminated those that seemed complicated or unrealistic and tested the others. Eventually, the best designs rose to the top, and the vehicle came together.
Preparing for the competition is time-consuming: Our team of about 30 students logged more than 10,000 hours in and out of class working on the vehicle. I logged approximately 800 hours working on thrusters, the integrated motors and propellers that move the vehicle. All of the team members are responsible for different aspects of building or piloting the ROV.
Besides the CAD designers, the team includes aspiring electrical and mechanical engineers who build specific components, such as electronic controls, buoyancy management systems, the gripper arm that completes the mission tasks and the underwater camera system. In addition, tether managers supervise the cables that supply the vehicle with power and a pilot operates the vehicle in the pool using a control panel and video monitors.
Once our vehicle was pool-ready, our pilot had plenty of time to practice using props that we had built. When the competition was held in June at Massachusetts Maritime Academy in Buzzards Bay, Mass., we were ready.
Each team received two chances to complete the mission tasks. In addition, we had to prepare a technical report and engineering presentation to industry experts who volunteer as judges, and create a poster presentation that explained how we created our ROV.
In previous competitions, we experienced many challenges, such as vehicle malfunctions, inability to complete all the mission tasks or presentation errors. But this year was different: In the mission tasks, all of our practice time paid off and both of our mission tries were nearly perfect. We were the only team able to complete all of the mission tasks under the allotted time and receive bonus points.
At the MATE awards ceremony, we learned that we won the overall competition for the Explorer vehicle class, and we also won the Explorer class awards for the top technical report, engineering evaluation and poster presentation. This year, we had the right team and the right technology to finally win the competition.
The best part is not what we won, but what we learned. We learned how to work as a research, development and design team. We learned how the engineering process works from start to end--how to turn napkin sketches and chalkboard drawings into a functioning vehicle in nine months. Most importantly, we learned how to function in the real-world engineering workplace.
Participating in the MATE ROV competition has given us the skills and experiences that that will help us be successful members of the marine technology workforce.
Ian Jasper, Long Beach City College
Image Caption: Three Long Beach City College ROV team members transport their vehicle from the pool. On the left is Ricardo Casaine, in the middle is Nathan Grefe, and on the right is Baxter Hutchinson. Credit: Credit: Steve Van Meter/VideoRay
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