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- What paint do you use to paint the car?
- How did you guys go about designing your shell to shell attachment mechanism?
- In general, something quick to attach/detatch
- leaving small gaps - enough to tape over
- Any insight on how to do large-format resin infusion? Do you do yours in house?
- Own layups using prepreg
- Prepreg hard to source
- Kentucky may use wet layups for the whole shell
- Own layups using prepreg
- How do you attach your bulkheads to your car?
- MIT has no bulkheads
- MIT has no bulkheads
- what mold release do you use?
- frekote
- peel ply
- foam → fiberglass tooling → frekote, shell
- Array Attachment
- VHB Tape between array and composite shell
Dynamics
- Frame
How do you simulate your frame?Solid bodies/Shells?If solids, do you use beams to establish displacement BCs or do you just simulate with load cases
Experience doing a space frame or is all frame sim on composites?
- Suspension
- How do you train your members to have a good knowledge and intuition of kinematics, especially freshmen who haven't taken dynamics yet
- 1st month is just developing skills
- Statics FBD,CAD, Assembly, FEA,
- New members get a subteam project
- Brakes makes a calculation spreadsheet off of a FBD
- Lot of shadowing upperclassmen
- Freshmen usually don't design anything on their own
- Take in a lot of sophomores
- No rigid curriculum
- If there are less upperclassmen, focus more on education
- Recruiting
- Open to anyone who's interested in joining
- let people self select
- no goal/application
- what resources do yall use to better understand susp technical concepts
- How do you train your members to have a good knowledge and intuition of kinematics, especially freshmen who haven't taken dynamics yet
- UNSPRUNG MASS
- How do you design parts that can withstand fatigue? Hand calcs? FEA? Want to design for ASC not just FSGP
- FEA internal SF higher than regs
- Instron testing of all welds/composites
- Spare parts
- Precedent on old parts
- No specific calculations
- Do you use topology optimization for lightning or do you do it by hand/trial and error?
- Only brake rotors
- Start with base design, run FEA
- Would rather have testing time rather than design optimization
- Do you use the Mitsuba motor? What do you aim for in your tires
- what tires do you use?
- Bridgestone
- Source first since they take a while
- 200kg with
- what tires do you use?
- Do you use 2 motors
- Direct drive
- 2 on Gemini (MOV)
- 1 on their (SOV)
- How do you design parts that can withstand fatigue? Hand calcs? FEA? Want to design for ASC not just FSGP
- Steering
- How do you control toe on your rear wheels?
- double wishbone on front
- modified L arm on the back
- How do you control toe on your rear wheels?
- What is your upper level design process/design philosophy?
- Start by deciding steering system that you want to use
- noralyl will compartmentalize and then ensure that each part of the system integrates onto the upright
- look for where steering can best attach to the upright first
- steering angle chosen early on
- Nimbus
- acrmin but not
- Gemini
- achermin full on
- Make sure things are overconstarining your system and then making sure that the system no break
- what kind of testing/validation do yall do?
- To what level do you model and characterize your car?
- What components do you characterize(ie. shock absorber characteristics)
- what data do you collect from onboard sensors
- how do yall set up ur tests,
- what are the inputs/outputs
- Speed of Car
- Temp of battery
- TMPS
- Lux measurement
- (no IMUs just talked about it)
- what have u learned abt how to do a test correctly/efficiently?
- how do u calculate uncertainty in the sensors (if at all)
- Senor uncertainty isn't really kept into account
- good enough sensors should be close enough that you probably arent worried about it propagating out
- How do you decide what data should be sent over telemetry during/after driving?
- Strat team will take input from the car telemetry and a scout car that takes info at the front and then they spit out target range of speed and then stick to it
- How do you choose what sensors to use?
- Hall for battery 40A onboard (on PCB)
- What is your transmission range?
- Range for transmission
- How did you decide on the placement of the radios/antennae (if applicable)?
- Do you do any analysis to predict the amount of noise generated by different arrangements?
- How do you store your telemetry data?
- How is the data incorporated into your workflow?
- To what level do you model and characterize your car?
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