A summary of points relevant to our car
Onboarding Resource
Static Analysis -Front Suspension
inside wheel of solar car vs FSAE usually outside wheel analysis because N force >
Force analysis and designing parts for loads
2g bump, 1g lateral force turn, 1g braking input forces referenced to the contact patch
keep in mind the changes in N force during all ^ behaviors
MINIMUM
statics problem w 3 torques 3 forces
if pass forces on one component - pass to the next component - to the frame - determine if the frame mounting point will fail at these conditions
combined loading conditions AND separated loading conditions
one loading condition may be HELPING the other one - so important to do combine + separate because it may pass in combined but not separate
ex) braking + cornering - cornering may be helping alleviate the > N force on front axles during braking and < load from pitching forward - vice versa
brake perform analysis
VDR Requirements - will car survive brake system, will brake system survive, will car perform and pass dynamics brake performance (4.7 m/s^2)
pedal force required? - panic stop - when our car is decelerating at this rate ^ (to pass) then how much is the pounds of force on pedal to achieve that?
is this a reasonable number? too much or too little force to achieve is not good
hard to modulate brakes that react too easily - preventing from locking up
convergent behavior
what point do front lock up vs required force to gen 4.72 m/s^2 gradual braking
50 lbs F to braking performance vs 60 lbs to lock up - driver needs to be good at working in the spot between - decelerating but not locking up
at point F wheels lock up - did rear wheels lock up yet
wheels that lock up are not preventing slip - no lateral acceleration or cornering force
locked up wheels have now lost their ability to stop themselves from sliding
front with braking force and imbalances / if one wheel is more brake force or CG not centered or sidewind - back wheels will slide to one side and create a yaw and now unstable = spinout
sim - 200lbs F on the brake pedal and box - does the mount and hydraulics survive?