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