Transcript of Ashley Wyatt Xavier Thompson Matt Galles Bobby Costen Chris McHugh Randy Fulcher 2014-2015 ODU FSAE...
- Slide 1
- Ashley Wyatt Xavier Thompson Matt Galles Bobby Costen Chris
McHugh Randy Fulcher 2014-2015 ODU FSAE Car
- Slide 2
- Frame
- Slide 3
- Suspension Handle course impacts from imperfections Increase
contact patch Dynamic system
- Slide 4
- Prior to designing: Camber angle Caster angle Kingpin
Inclination (KPI) Steering axis angle Scrub radius Included angle
Toe in Toe out Roll Center
- Slide 5
- Camber Angle Critical Width of contact patch Negative improves
handling in corners Prevent understeer
http://www.benzworld.org/forums/w126-s-se-sec-sel-sd/1678465-rear-tire-wear-due-negative-camber.html
- Slide 6
- Caster Angle Automatically realigns tires Improves directional
feel Adds negative camber during turns
http://www.toyota-4runner.org/5th-gen-t4rs/167451-fitting-285-tires-lr-ucas-adjusting-caster.html
- Slide 7
- Ackermann Steering Geometry The intention of Ackermann geometry
is to avoid the need for tires to slip sideways when following the
path around a curve. The geometrical solution to this is for all
wheels to have their axles arranged as radii of a circle with a
common center point.
- Slide 8
- Ackermann Steering Geometry Rear wheels are fixed and a center
point must be on a line extended from the rear axle. This line
intersects the axes of the front wheels and requires that the
inside front wheel is turned, when steering, through a greater
angle than the outside wheel.
- Slide 9
- Carbon Fiber Wheels Reduction in weight Increases fuel
efficiency Higher tensile strength than most metals
- Slide 10
- Stats from Material Testing at Ohio State University
https://kb.osu.edu/dspace/bitstream/handle/1811/58422/carbon_whe
el_thesis_FINAL.pdf?sequence=1
- Slide 11
- Aluminum Rim Piece:Carbon Fiber Rim Piece: Moment (in*lbs.)
=3900 Weight (lbs.) =7.1 Deflection Angle (Degrees)= 0.036
Stiffness (in*lbs./Degrees) =84782.6 Specific Stiffness
(stiffness/lbs.) =11941.2 Moment (in*lbs.)= 3900 Weight (lbs.)=
1.73 Deflection Angle (Degrees) =.21 Stiffness (in*lbs./Degrees) =
18571.4 Specific Stiffness (stiffness/lbs.)=10734.9
- Slide 12
- Rear Suspension Change from Pull-Rod to Push-Rod System
Suspension travel will be increased A-Arms overdesigned to handle
additional bending moments Upper A-arm carries weight of
vehicle
- Slide 13
- Upright Design Weight Reduction Adjustability Room for Brake
Caliber Attachment Adjustable Toe- In /Out