Fall 2024 - SRR ...
todo:
upload pictures from pre-SRR mech meetings - parameterization
upload jacob lecture audio #1 tilting
upload jacob lecture audio #2 (dynamics room)
upload conversations from robert audio
other resources todo:
meeting w IC suspension members
meeting with robert about shock selection
check electric design sharepoint
https://pdfs.semanticscholar.org/b86d/bc4f5f60a10c107c5f4fb3c9c61a513426e4.pdf
https://www.reddit.com/r/solarracing/comments/141vkvf/3_vs_4_wheels/
https://www.reddit.com/r/solarracing/comments/asgzr8/suspension_design/
https://www.reddit.com/r/bajasae/comments/wx3ohc/which_of_these_is_trailing_arm_and_semi_trailing/
https://engineerdog.com/wp-content/uploads/2015/09/delta-vs-tadpole-steering.jpg
https://www.notion.so/8-30-square-1-5261c037b4604d5085155e8138966d66?pvs=4 (notes from discussions with lhr leads)
https://www.notion.so/updated-suspension-parts-fa0b0c813f1b41c993cdce7381d99bb2?pvs=4 (notes from budgeting, updating purchases, repairing daybreak/new car)
https://msumcmaster.ca/app/uploads/2021/11/2021-2022-Solar-Car-Presentation.pdf (trailing arm resource)
overall 3 v 4
understeer vs tipping - tradeoffs in trying to redistribute weight to the front suspension, correcting understeering vs oversteering in 3 wheels
“tadpole design has to incorporate extra linkages to approximate ‘Ackermann’ steering geometry to prevent wheel slippage”
winning solar car prefers 3 wheel: lighter, less complex to design/manufacture, simpler rear align, gen > energy efficient
BUT easy for car to go into spin if traction lost in rear - 60-70% of weight should be allocated to front of car to combat risk of a blowout and for braking purposes
LHR discussions
tanu, robert, jacob, nathan,
What is the difference between swing arm, trailing arm, and semi-trailing arm?
trailing swing arm
torsional rigidity in main arm
main arm like trailing
side arm for supporting lateral loads
not that good at adjusting / tuning to be vertical - would need a trial
trailing - only travels vertically so conserves most energy
careful of bending stresses in the main vs swing because they need to retain rigidity and vertical wheel to chassis under lltd
spring placements
llt capacity >>
less bending stress
rr >, possible assembly weight >, but generally less unsprung weight
semi - two pivot points ^
generally same notes as trailing
roll center can be modified
^ seems to be more stable than trailing (less info on three wheel / solar applications)
What are constraints from regs?
000 vs dynamics test - how much more can we theoretically increase our trackwidth / wheelbase - overall current shell and frame by regs? bulkhead space? '
changes to overall car based on 3 wheel - dynamics testing constraints
Frame and aeroshell constraints - to determine how much we can change overall trackwidth and wheelbase - what determined the space in space frame?
noah’s notes
suspension and wheel turnout cutouts
array surface area
overall aerodynamics sims → packaging
Hardpoints?
^
vsusp - lower ride height - check at garage
shocks
change the rear to a coil shock - but based on what parameters - shock discussion TBA
minimize angle to vertical
closer to the rear wheel and rod ends
MEOWWWWWWWWWW
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