Uncategorized

Altium Appreciation

Greetings!

The new semester has begun, and we have a wave of new members, who along with the current team, are already hard at work- designing and building parts for Flux.

MIT Solar Electric Vehicle Team likes to custom design and build as much of the car as we can. This would not be possible without the help of one of our Platinum sponsors, Altium.  Last Monday, our one-year license was renewed. This allows 10 of our members to have access to the software. Thus, we can teach new members how to create schematics and layouts for our boards and get our electrical system optimized and customized. Altium also provides the very useful function of providing an automatic bill of materials, which makes the actual manufacturing process a lot easier.

Our team is very thankful for Altium’s continued support, and helping us make Flux run! (…I mean drive)

CAR

By |Uncategorized|Comments Off on Altium Appreciation

Updates

A statement from the team captain:

Hi everyone,

Apologies for the radio silence following our last post in November; as you can imagine, we’ve been fairly busy building our car and undergoing some significant team changes.

I would like to announce some recent decisions that the team has come to in light of our assessment of the feasibility of participating in 2017 Bridgestone World Solar Challenge this year. After multiple meetings that spanned several hours, the team has reached the decision that we will not be attending BWSC 2017 this October. This was not an easy decision for obvious reasons, but in the end we decided that there was simply not enough time to properly test and prepare ourselves for the race, and so the conclusion we came to was with the intention that we could have the opportunity to safely optimize what we currently have.

We would like to thank everyone – from all of our sponsors to specific individuals – for all of their help thus far; we are truly thankful for their continuous support. Though it’s a sad decision short term, and certainly not an easy one to make, I believe we’ve made a good decision for the long run that will allow us to properly prepare and ensure resources are well-spent. We look forward to taking on future races with an improved car and team.

Sincerely,

Veronica LaBelle

MIT SEVT, Captain

By |Uncategorized|Comments Off on Updates

Composite Layup 2016

First we are pleased to announce the name for our newest solar car, which we will be taking to the 2017 Bridgestone World Solar Challenge, will be named Flux! On that note we are happy to say as well that our team is now officially registered for the 2017 Bridgestone World Solar Challenge.

It is now well into the fall semester, people are studying for finals, the leaves have fallen, and the team has been busy building Flux. The biggest part of this has been the composite layup (see below if you aren’t familiar with this) for Flux’s body. The molds for the upper and lower body were made by Custom Composite Technologies in Maine. We traveled to Maine on the weekends in order to complete all the layups that needed to be done. In total the team has been in Maine five weekends this semester from September through November. There were many late nights, but also some great times as well, such as the team trying to devour three 28-inch pizzas. Sadly the pizzas won. Between all of the weekends we manufactured: the canopy, the top body, and the lower body. We finished off by assembling the chassis and bonding it to the lower body. We have made amazing progress for one semester, and most of the composites work is almost done. Check out some of the pictures from the layup below.

What is a Composite Layup?

In order to make the car as light as possible we use composite materials, such as carbon fiber and Kevlar, as much as possible. Basically we use sheets of woven carbon fiber or kevlar that we then glue together to make a sheet with a high strength to weight ratio. However a single sheet is very thin and flexible. So we make a sandwich-panel where a sheet of honey-comb is sandwiched between two composite sheets. This increases the thickness of the panel making it stiffer.

Laying-up is the actual process of manufacturing a composite material. There are two main layup processes that the team uses: a wet layup, and a prepreg layup. In a wet layup the fibers start out dry. They need to be covered in epoxy before they can be placed on the mold. On the other hand a prepreg layup starts with fibers that are pre-impregnated (or prepreg) with epoxy. With wet layups the epoxy will cure in about a day, and you only have a few hours before it becomes semi-solid. So with wet layups the team has to move fast. Whereas with prepreg the epoxy will take about a month to cure at room temperature, so the work can go much slower. However to get prepreg to properly cure it needs to be heated up with a car-sized oven.

By |Uncategorized|Comments Off on Composite Layup 2016

Summer Wrap Up

This summer was a really exciting time for MIT’s Solar Electric Vehicle Team. After coming back from the road trip, we got to work on constructing the latest vehicle for the 2017 World Solar Challenge. The release of the regulations gave us fun design challenges to think about.

We had several people working full time on solar car over the summer. They acted as owners of specific projects from designing the steering system to the turning fairings. Many of these students working full time were freshman, so they had the opportunity to conduct independent research and become experts in specific fields. Shop started at 11 AM and sometimes went late into the night, but thankfully there was breaks for Mexican food and other fun activities!

Now that the semester is underway, there are classes as well as solar car activities, so we are not in shop everyday! Currently, we have many new members and they are doing exciting new projects!

The future looks bright!

Posted on behalf of Priya Kikani

By |Uncategorized|Comments Off on Summer Wrap Up

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

Aerodynamic Design with ANSYS

ANSYS is one of the team’s newest platinum sponsors. They have generously provided the team with several simulation packages, including Fluent which the aerodynamics team uses extensively in our analysis of the solar car.

Ansys Simulation

Aerodynamic drag makes up the majority of the power loss during the normal running of a solar car, thus it is of upmost importance that the car’s shape is optimized to minimize this loss. ANSYS Computational Fluid Dynamics (CFD) products enable us to perform detailed analysis to help us iterate on our designs. By looking at pressure distributions, identifying vortices, and looking out for flow separation, the aerodynamics team have a myriad of tools with which we can improve our design.

We are delighted to use ANSYS Fluent for its fast, accurate and reliable results. If you would like to try your hand at some simulations, check out ANSYS Student, which is available free to all students worldwide. It includes several solid as well as fluid solvers, and is ideal for those who want to explore engineering design.

Ansys simulation2

Posted on behalf of: Tommy Li

By |Uncategorized|Comments Off on Aerodynamic Design with ANSYS

Battle of the cakes 2016

It is that time of year again: time for battle of the cakes. On our team we have a tradition that every year during a team potluck there is a cake baking competition between the freshmen/new members and the upperclassmen. The rules are simple as a team bake a cake based on our solar car and then a panel of third party judges will decide the winner based on taste and appearance. Last year the freshmen won in a land slide, as you can see below. So who won this year? The judges have their opinions, but before we tell you we want to know your opinion. Check out the two cakes (in no particular order), and then vote below.

Cake 1

Cake 1

Cake 2

Cake 2

2015-cakes.

Last year’s cake entries. The freshman cake is back.

All photos were taken by the author

By |food, just for fun, photos, team, Uncategorized|Comments Off on Battle of the cakes 2016

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

Following us during Bridgestone World Solar Challenge

Tomorrow the team will be leaving for Australia! Here’s how to follow us during the Bridgestone World Solar Challenge. During the actual challenge (Oct 18-25) we will be blogging daily and posting pictures to Instagram on the MITstudents account. During the challenge though we will be in the middle of the outback with very little internet connection. So our schedule may be odd, but don’t fret we will find a way to post content. Also the organizers will be putting up quite a bit of content so check them out at worldsolarchallenge.org.
Bridgestone World Solar Challenge PRIMARY LOGO

By |Uncategorized|Comments Off on Following us during Bridgestone World Solar Challenge