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Suspension Peter Morabito Michael Paliga Brian Ross Drivetrain Kenny Elliot Patrick Mooney Dylan Quinn Frame Dan DAmico Curtis May Greg Schafran Slide 2 To design a vehicle for the SAE Baja Competition Slide 3 Slide 4 Slide 5 [Veh. wt]*[Sin(incline angle)] = Repelling Weight [650 lbs]*[Sin(40 degrees)] = 418 lbs Rep wt = (tire rad)*(CVT ratio)*(engine tq)*(X min) 418 lbs = (1.0 ft)*(3.85)*(14 lb-ft)*(X min) ----->Xmin= 7.7551 Gear Ratio Calculations Slide 6 Stage 1 - 2.0:1 Size: 20/40 teeth Pitch: 12 Face Width: 1.0 in Stage 2 - 4.0:1 Size: 20/80 teeth Pitch: 12 Face Width: 1.5 in 6.5 inch diameter output gear allows room for differential mounting to increase vehicle handling. Slide 7 Slide 8 Slide 9 Front Suspension Basic Double A-arm setup Same overall design as previous years car No significant changes, just modifying to fit newly designed frame Rear Suspension Using a rear trailing arm set up similar to the 2012 car Eliminating the dynamic toe aspect, but maintaining the dynamic camber Improving wheel travel and reliability Slide 10 ASSEMBLYFRONT REAR Slide 11 Steering wheel angle vs. steering angle (front left) Motion is of a body roll Slide 12 Camber angle (rear right) Motion is of a body roll Slide 13 Camber Angle (rear right) Motion is of a jump Slide 14 Camber angle (front right) Motion is of a jump Slide 15 FEA - Stress FEA - Displacement TRAILING ARM 1 X 0.065 4130 STEEL Slide 16 UPPER A-ARM FEA - Stress FEA - Displacement 1 X 0.065 4130 STEEL Slide 17 LOWER A-ARM FEA - Stress FEA - Displacement 1 X 0.065 4130 STEEL Slide 18 Fox Float Racing Shocks: Adjustable air spring, velocity damping control, and light weight. Reduced Cost - $521.25 per pair versus $859 per pair for Custom Works Shocks. Comparable performance Slide 19 Frame- Methods SAE standards SAE standards Firewall Firewall Front end Front end Roll cage Roll cage Rear end Rear end Finite Element Analysis Finite Element Analysis Slide 20 The 2012 ODU Mini Baja (55 th place) weighed 479 pounds The 2012 ODU Mini Baja (55 th place) weighed 479 pounds Cornells car (3 rd place) weighed only 306 pounds Cornells car (3 rd place) weighed only 306 pounds Reduce frame size and weight Reduce frame size and weight Eliminate redundant members Eliminate redundant members Frame- Analysis Slide 21 Material-4130 steel tubing: primary members: 1.25x.065 secondary members: 1x.065 Shorter overall length Lighter than previous ODU cars: 63.7 lbs. Frame- Results Slide 22 Slide 23 Slide 24 Slide 25 Slide 26