University of Minnesota Solar Vehicle Project

The University of Minnesota Solar Vehicle Project, or UMNSVP, is a team of undergraduate students from the University of Minnesota that designs and constructs solar-powered cars. In its 29 years, it has established itself as one of the world's top solar racing teams, and the top Cruiser/MOV team in the Western Hemisphere, with top-two finishes in eighteen of thirty-four events entered.

Members of UMNSVP pose with Eos II outside Lind Hall at the University of Minnesota.

History

Beginnings

The University of Minnesota Solar Vehicle Project was founded following the GM Sunrayce USA in 1990. With little to no prior knowledge, the team successfully built and raced Aurora I in Sunrayce 93.

Aurora Generation

The Aurora generation of UMNSVP cars, starting with Aurora II, mostly followed the "cutout" design that was typical of the 1990s, with a relatively flat body and a bubble canopy. Over three cars, the design was refined more and more. All three of the Aurora vehicles had successful trips to international races, culminating in a 4th place in class finish in the 1999 World Solar Challenge in Australia.

Borealis Generation

The Borealis series of cars represents the newer generation of solar cars: exotic, aerodynamic "manta-style" bodies with unlimited array area, able to (under ideal conditions) travel as fast as, or faster than, the flow of traffic on any road. All three of the Borealis cars have been extremely successful.

Centaurus Generation

The new Centaurus series of cars took the project to a whole new level by allowing the driver to sit upright while driving. Three were built in the series, and it is clear that they quickly improved to achieve the levels of success the team enjoyed with the earlier Aurora and Borealis series cars.

Daedalus

Daedalus marked a drastic design change from all of the team's previous solar cars. Designed for the new cruiser class in the 2013 Bridgestone World Solar Challenge, Daedalus was the team's first two-seater car and emphasized practicality. The car incorporated padded seats, a sound system, and a Nexus 7 tablet display.

Eos Generation

Eos I is the UMNSVP's 12th solar vehicle and was designed and built for the 2015 Bridgestone World Solar Challenge Cruiser Class, like its predecessor, Daedalus. It featured improvements in both performance and practicality. It was the first Cruiser car to ever compete in the American Solar Challenge. Eos II, the team's newest solar vehicle, builds upon that foundation and has proved to be one of the team's most reliable and efficient vehicles yet.

Achievements
Borealis III crosses the border to Canada on July 21, 2005.

In 29 years of competition, UMNSVP has built and raced 13 different cars, assembling one of the best records in solar car racing. In the team's history:

  • No car has ever failed to qualify for or finish a race
  • First or second-place finishes in eighteen of thirty-four events entered
  • 8 top-five finishes in international competition
  • Raced in 5 different countries
  • Finished 2nd Place in the American Solar Challenge 6 times
  • 1st place victories in Formula Sun Grand Prix 5 times

UMNSVP takes great pride in being one of the very few collegiate solar car teams that researches, assembles, encapsulates, and attaches its own solar array. In fact, almost everything on the car is designed, built, and programmed by team members.

On July 21, 2005, during the North American Solar Challenge, Borealis III passed from the United States to Canada to become the first solar car to cross an international boundary during a race.

After the team's first race, UMNSVP has placed in the top 5 at the American Solar Challenge 9 times, no team has done that more times.

UMNSVP holds the record for the most FSGP victories; the only team with 5.

UMNSVP finished in the top-5 of 4 consecutive World Solar Challenges - the only American team to ever accomplish this feat.

In 2016, Eos I became the first Cruiser car to ever compete in the American Solar Challenge.

The future

The team is working on designing and building their 14th solar vehicle.

Team Composition

Participants

The UMNSVP team is composed mainly of undergraduate students from the Twin Cities Campus of the University of Minnesota. Most of the participants are studying some sort of engineering in the University's College of Science and Engineering, but students of any major are welcome to join the team. The team is usually composed of 40 to 60 students.

Subteams

The team is composed of 5 main sub-teams. Each team is responsible for designing certain components of the car, although all the systems must eventually be integrated with one another.

  • The Aerodynamics and Structures Team is responsible for designing and constructing the outside shell of the vehicle. At most speeds, much of the power to drive the car is spent on air resistance. Thus, a shell with a low drag coefficient must be built. In addition, much of the vehicle construction involving lightweight composite materials is done by the Aerodynamics Team.
  • The Array Team is responsible for creating the solar array that is the primary source of the vehicle's power. The Array Team does not just attach the solar cells to the car, but must also research encapsulation techniques to protect the fragile solar cells. The University of Minnesota Solar Vehicle Project is one of the few collegiate teams that encapsulates and mounts their own array.
  • The Controls Team is responsible for designing, building, and programming all of the electrical systems of the car. This includes the batteries, power trackers, driver interface, telemetry systems, and the electric motor that drives the car. The primary goal of the Electrical Team is efficiency; the less power a device uses, the longer the car will be able to go.
  • The Vehicle Dynamics Team is responsible for the design and fabrication of the structural and moving parts of the car, including the suspension, steering, and chassis of the car. The largest challenges presented are to make the components as light and as small as possible so that the car may go faster.
  • The Operations Team manages the project's fundraising and public relations, ensuring the team has a presence with both sponsors and various educational activities.

Administration

In addition to the 5 sub-teams, there is also an executive team. This team composed of students from the sub-teams; it is responsible for taking on the duties of the team that are not directly associated with the vehicle, such as acquiring sponsors and setting meeting times.

As with any student group at the University of Minnesota, UMNSVP must have a faculty advisor. The faculty advisor is not directly involved with the design or construction of the car, but performs executive duties and serves as a contact to the University. The current faculty advisors for the team are Professors David Orser and Philip Cohen (Electrical and Computer Engineering). Previous faculty advisors include Professors Jeff Hammer, Patrick Starr, Virgil Marple, and Paul Imbertson.

Cars

The University of Minnesota Solar Vehicle Project has built 13 cars in its history:

Aurora I

Aurora I was the first vehicle built by UMNSVP. It is arguably one of the largest solar cars ever built for a race. It served as a solid basis of knowledge with which to work on future projects.

Aurora II

Aurora II built heavily on the experience gained from Aurora I. It featured a complete redesign from the previous car and made the UMNSVP a permanent fixture in the world of Solar Car Raycing.

  • Sunrayce 95 (Indianapolis, Indiana to Golden, Colorado)
    • 2nd Place Overall
    • Best daily average speed (50.4 mph)
    • Awarded "EDS Best use of Aerodynamics in Design"
  • 1995 World Solar Rallye (Akita, Japan)
    • 2nd Place, Junior Class
    • 9th Place Overall (out of 79)

Aurora3

Aurora³ was a redesign of Aurora II, with a focus on improving the efficiency of the car. It featured a more aerodynamic shape and an in-wheel motor, which was a vast improvement over Aurora II's chain driven motor.

  • Sunrayce 97 (Indianapolis, Indiana to Colorado Springs, Colorado)
    • 11th Place Overall (out of 36), due to a brake failure after brake fluid that was incompatible with the seals on the brake system caused the team to lose most of a day for repairs.
    • Broke the Sunrayce daily speed record set by Aurora II in Sunrayce 95 with a 54 MPH average speed over the 166 mile journey from Smith Center, Kansas to St. Francis, Kansas
    • 3rd Place, teamwork
  • 1998 World Solar Rallye (Akita, Japan)
    • 1st Place, Junior Class
    • 7th Place overall (out of 81)
  • 2000 Formula Sun Grand Prix (Heartland Park, Topeka, Kansas)
    • 2nd Place Open Class
    • 3rd Place Overall
    • 1st Place, 1/4 mile drag race

Aurora 4

Aurora 4 improved on the successes of the Aurora class of cars. The nickel-metal hydride battery pack was the first new battery technology used by the Minnesota team, and the solar array was the first to use two different sizes of photovoltaic solar cells. The team overcame a collision with its lead vehicle and many days of rain for a 4th-place finish in Sunrayce '99. It was the second 4-wheeled car that the UMNSVP built after Aurora I.

Borealis I

Borealis I featured a major redesign from the tried-and-true cutout car. Instead of a flat shell with a "bubble" canopy, the team used an innovative "manta" shell design, where the windshield and canopy are integrated into the body of the car. Also, nearly all other systems were redesigned for higher performance.

In early 2005, Borealis I was sold to the Illinois State University Solar Car Team, where it was refitted with new electronics and solar panels. ISU raced it as Mercury I in the 2005 North American Solar Challenge, where they finished 18th. Its chassis was re-used for their 2008 car Mercury II, but unfortunately, troubles with their motor prevented them from qualifying. In 2009, Mercury II finished 5th out of 11 entered vehicles in the 2009 Formula Sun Grand Prix.

Borealis II

Borealis II improved on the design of Borealis I, stressing first and foremost reliability, which resulted in a relatively heavy car. It overcame a number of mishaps that damaged the car to become one of UMNSVP's most successful projects to date.

Borealis III
Borealis III leads the way during the 2005 North American Solar Challenge, passing by Lake Benton, Minnesota.

Borealis III improved upon its predecessors by stressing efficiency and weight reduction; the car weighs just over 400 lb. Borealis III was also the first solar car in history to cross an international boundary during a race; it did so on July 21, 2005 during that year's North American Solar Challenge.

During June and July 2006, Borealis III underwent slight modifications in order to race in the World Solar Rally in Taiwan in September 2006.

Centaurus I

Centaurus I featured several major design adjustments from both previous series of cars. Due to a change in the North American Solar Challenge rules for 2008 requiring the driver to sit upright, the team was faced with the task of allowing the driver to do this while still minimizing aerodynamic drag. Many design components were reworked to fit the new style of vehicle and improve performance.

Centaurus II

Centaurus II was designed for the 2010 American Solar Challenge. Building off of experience from C1, the team managed to build a much lighter car (389 lbs empty, versus ~440 lbs for C1), as well as decrease the aerodynamic drag by a significant margin. Despite having one of the cheapest solar arrays at the event, the team managed to finish in 2nd place overall.

Centaurus III

Centaurus III was the culmination of the Centaurus series with improvements in weight and aerodynamics. Designed for the 2012 American Solar Challenge, it was slowed in the middle of the race by faulty thermistors. In 2014 it was renamed Centaurus π and was refitted with a new electrical system and a vinyl wrap for the 2014 American Solar Challenge. There the car realized its full potential by finishing 2nd overall despite having to overcome extensive water damage to the solar car and team equipment before the final day of the Formula Sun Grand Prix qualifying race.

Daedalus

Daedalus marked a drastic design change from the team's previous solar cars. Designed for the new cruiser class in the World Solar Challenge, it was the team's first two-seater car with an emphasis on practicality. The team overcame electrical problems to be in the minority of teams to finish the race without trailering. Daedalus also marked a permanent switch from three-wheeled to four-wheeled solar cars.

Eos I

Eos I continues the team's focus on more practical multi-occupant solar cars. It differs from Daedalus in that the occupants are on either side of the catamaran shell with door on the sides instead of a canopy on top. Eos finished BWSC 2015 without trailering despite a more challenging scoring formula and regulations. In 2016, Eos I became the first Cruiser car to ever compete in the American Solar Challenge.

Eos II

Eos II is the team's newest solar vehicle. It incorporates significant aerodynamic and solar array improvements from the previous car. It competed in the 2017 BWSC Cruiser Class against teams from around the world, and finished with zero breakdowns. The follow year Eos II won FSGP 2018, and competed the first ever ASC MOV (Multi-Occupant Vehicle) class, leading the race for over 70% of the distance along the Oregon Trail, before experiencing an unfortunate electrical failure and finishing in 2nd Place.

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See also

References
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