sevt

Road Trip 2016: Ohio

The week following finals is usually a relaxing time to unwind, relax, and try to put those nasty tests in perspective. However, this is not true for solar car. Finals had barely finished, and the team was already abuzz with activity. The team was getting ready to leave on a road trip that Sunday for Ohio. Road trips are a strong tradition on the team, and for good reason; they offer a great chance to extensively test the solar car on public roads, get the team ready to perform in the upcoming solar challenges, and help train the next generation of drivers.

Photo Credit: Chris Pentacoff '06

Photo Credit: Chris Pentacoff ’06

This year’s road trip was during the last week of May in Columbus, Ohio. The main purpose of this road trip was to get more strategy data on Arcturus, and use Arcturus as a test bed for ideas for the next car. This included testing Arcturus with an off center center of mass to see how stable an asymmetric car would be. This road trip helped train new team members on how to work together during a solar challenge. From this road trip we now have two new solar car drivers who are both comfortable with driving at highway speeds. The data that we collected on our electrical system, brakes, balance, and stability will help improve the design for our 2017 car. The road trip helped with weeding out more issues that team can now address and prevent in future designs.

If you want to see more from the roadtrip check out our flickr

2016 Ohio Road Trip

By |ee, MechE, photography, photos, sevt, testing, Uncategorized|Comments Off on Road Trip 2016: Ohio

Regulations Released for 2017 Bridgestone World Solar Challenge

Just today the regulations for the 2017 Bridgestone World Solar Challenge were released. Since then the team has been meticulously reading the regulations. The team mailing list has been ablaze with emails looking at the impact of the regulations of the design.

From the regulations’ introduction here are the biggest changes that have been made for 2017:

  • The maximum allowable size for cars has been increased to allow greater diversity of design, and provisions made to find synergy with other international events.
  • Challenger solar collector area has been reduced to 4 m2 (for silicon PV) half of what was allowed in the first World Solar Challenge in 1987.
  • Cruiser solar collector area is reduced to 5 m2 for silicon PV cells, to make it easier to fit a solar collector on a practical car.
  • The apertures of solar reflectors and concentrators will be restricted.
  • Refinements have been made to the requirements for occupant protection and vehicle dynamics. In addition there is a new requirement for mechanical braking on all road wheels.
  • Energy storage limits have been removed for Cruiser Class, which will be run as a single stage regularity trial’, Success in Cruiser Class will be based on energy efficiency practicality and adherence to time targets.
  • Adventure Class will be non-competitive.

This marks many large changes for all of the classes. For challenger class, which we hope to compete in, this greatly reduces the solar collector area. The regulations also limit solar concentrators and other devices which will ultimately reduce the power output of the car’s solar array. More than ever efficiency will be the name of the game as teams work to further optimize how the precious Watts the solar array produce are used. Car will be lighter, and more aerodynamic, and will continue to push the boundary of efficiency. our team is excited to take this challenge head on, and hopes to see everyone at the start line on Saturday October 8,2017.

Bridgestone World Solar Challenge PRIMARY LOGO

By |BWSC17, darwin, hidden valley, scrutineering, sevt, team, Uncategorized, World Solar Challenge|Comments Off on Regulations Released for 2017 Bridgestone World Solar Challenge

Spring Semester and Tilted Solar Cells

This week is the first week of classes for the spring semester. This is rather late for a college to be starting classes, but as I mentioned in our last blog MIT has the Individual Activities Period (IAP) for most of January. This is the fun week of figuring out classes, and bugging your Adviser every other day. I have managed to submit two add/drop forms by the second day of the semester. Let’s hope this trend doesn’t continue. So what does a nuclear Engineering student take? This semester I am taking thermal-fluids engineering, programming in MATLAB, Applied Nuclear Physics, and Soviet and Post-Soviet Politics.

Besides classes I have also been working on an interesting project for the solar car. Right now I am working on modeling the power output from possible array designs for our next car. I am working with the aerodynamics team to give them feedback so we can balance the aerodynamics with solar array output. In my research for this I came across this programming library called PVLIB which was developed by the PV Performance Modeling Collaborative at Sandia National Labs. This library is making my life so much easier by predicting the solar irradiance, calculating the “effective irradiance” for a single cell, and just doing all the complex (real numbers only) math I didn’t want to code. Now just to model a few hundred solar cells that move!

By |body, ee, sevt, Solar Cells, sponsors, Uncategorized|Comments Off on Spring Semester and Tilted Solar Cells

New Year, New Members, and New Projects

Happy very belated New Year! It’s now January and here at MIT that means only one thing: IAP, or Independent Activities Period. IAP is most of January and is a time for students to relax and focus of fun activities, projects, and classes. Some IAP favorites include: mystery hunt, Charm School, and Battlecode. But I’m not here to explain everything there is know about IAP, I’m actually here to talk about the most exciting thing about January: SNNNNNOOOOOOWWWWWWW!!!!!! Oh right also I’m talking about the second most exciting thing about January: Arcturus is back in shop!

Arcturus in Shop

Arcturus is back! She got back to port in late December. Our team Captain, Priya, and a few other team members who got back right at the beginning of IAP made the fun five hour drive to Newark port at 02:00 in the morning to pick our trailer up and bring it back to shop. So now Arcturus is back in shop. The electrical team was able to power her back up after a few days of unpacking and rewiring. This is because many of the connections were disconnected in order to make the battery safe for shipping. Now you may be wondering what our plans are for Arcturus. First of all the electrical team is right now working on debugging the electrical issues Arcturus was having at the end of the 2015 Bridgestone World Solar Challenge. We then plan to in the spring and summer drive Arcturus a lot to gather more data on her performance so we can better optimize a four-wheeled car. In the mean time there are many small projects to be done. Such as my “fake motor” project. We are planning to send our motors back to manufacturer for some maintenance and to prolong their lives. The problem is that our car uses hub motors which removes the need for gears or belts connect the motor and the wheel. However this means that right now without a motor there is no way to attach the rear wheels to the car. So my project is to design a system to attach the spindle and hub that we use on the front of the car to the rear suspension, so the rear wheels can still spin. Many of our members doing these projects are participating in the Undergraduate Research Opportunity Program (UROP) and are receiving credit right now for working on the team. For example one Freshman, Helen, is working on reducing the weight of our braking system and preventing brake rub.

Finally I promised to talk about snow. Snow is fantastic! Ok my northwestern love of snow is showing. This last weekend winter storm Jonas gave us three inches of snow; I was hoping for more but any snow is still snow. It was wonderful. I spent many hours in the snow, and my friend and I tried to make a snowman. However the snow was too powdery so instead we tried making snow sculptures. Sadly though Tuesday was above freezing so now there is no more snow. :(

Snow at MIT! :D

By |Arcturus, sevt, shop, testing|Comments Off on New Year, New Members, and New Projects

Road Trip to Detroit

As we previously mentioned, the team went to Detroit in July! Though the purpose of the trip was for wind tunnel testing, that activity only took one day, so we spent the rest of the week doing some serious road testing and practicing for the upcoming Bridgestone World Solar Challenge. This week of testing gave us valuable experience, allowed for design optimizations to be made, and gave us critical data on Arcturus’s power draw.

For those not familiar with Michigan, they have some very snowy, cold winters, which leads to many of their roads having pot holes. This was great for testing our suspension, but after proving our rugged design, it was time to allow the drivers to have some comfort in the form of a smooth road. We eventually found a suitable route in a rural town outside of Detroit. While driving out in the countryside, we noticed that there was a large thunderstorm forming on the Doppler RADAR. Fearing there might be hail, and with our trailer a few miles away, we sought the only feasible shelter, a gas station. This was definitely a good call, as, within a few minutes of parking Arcturus, a torrential downpour began.

Arcturus at a gas station

This testing was good, but we quickly became limited by the speed limit on our chosen route, so we graduated to testing Arcturus on rural highways. After speaking with the Superintendent, we were able to set up “camp” at a school along the highway we had chosen to test on. The route also had some good hills, which was great for testing.

Beyond testing the car and training our drivers, the road trip was great for meeting people and doing some informal outreach. Almost all of the people we met in Michigan were very kind and intrigued by the car. In fact, one of the teachers we happened to talk to ended up tweeting about us:

We left Michigan at the end of the week. Everyone was exhausted from seven long days of testing and fixing. This week provided great practice and road time to prepare for the 2015 Bridgestone World Solar Challenge. We even managed to get back to Boston in time to get the people who flew in for the week to the airport for their flights out. Check out the pictures from the road trip.

Bridgestone World Solar Challenge PRIMARY LOGO

Chopper is at Hidden Valley!!



We spent most of the daytime finishing up errands and buying materials that we needed, anxiously waiting for our shipping agent to clear up our customs issues. At 3pm we finally got the call and sprinted over to the Darwin airport to get our trailer. By 5pm, Chopper had arrived at Hidden Valley! We unpacked all our gear and went to work immediately.



We mostly had to finish lots of detail work – the night before we went through the rules one more time and marked a couple things we had to adjust in order to comply. We also built a solar array stand for charging pre- and post-race hours. Our trailer got updated with sponsor stickers.

We left pretty late, but there were still a few teams working! We’re back at the SEVT shack to a few hours of sleep, then back to the track for some more work. Stay tuned for more updates!

By |chopper del sol, hidden valley, sevt|Comments Off on Chopper is at Hidden Valley!!