Upright Team Lloyd Outten Joseph Perry Josh Carroll Taylor Watkins Frame Analysis Team Josh Carroll Lloyd Outten Intake & Exhaust Team James Hogge Rebekah McNally Alisa Phillips Henos Woldegiorgis 1 Design Competition for Collegiate students Represent ODU’s Engineering Department 8 part competition (8 Events) 2 3 [Car 106 Front Upright] [Car 106 Rear Upright] 4 Good Design, but hard to machine. The integrated components would add excess machining time and cost • Retains the strength • Separated and low weight of steering and brake brackets. original design while lowering machining cost. 5 Brake Bracket Upper A-Arm Connection Brake Caliper Connection Upper A-Arm Bracket Spec Sheet Material: 6061 Aluminum Total Assembly Weight. Total Assembly Volume: Weight by Part Main Upright Brake Bracket Upper A-Arm Bracket Spindle Steering Bracket 2.45 lb. 25.80 in3 Main Upright 1.42 lb. 0.44 lb. 0.12 lb. 0.33 lb. 0.11 lb. Steering Bracket Spindle Lower A-Arm Connection 6 Normal Loading Represents Weight of Car at maximum Turning Maximum Von Mises Stress: 46,152,184 N/m^2 Factor of Safety: 5.96 Braking Force Represents Maximum Braking Force Maximum Von Mises Stress: 46,929,128 N/m^2 Factor of Safety: 5.86 Steering Force Represents Maximum Steering Force Maximum Von Mises Stress: 117,611,216 N/m^2 Factor of Safety: 2.34 7 Original Design • One solid piece • Heavy (2.51 lbs) • Requires optimization Midterm Final Design • • • • One solid piece Very light (1.64 lbs) Difficult to machine Sharp edges result in multiple stress concentrations Final Design • Three pieces 1. Upright 2. Two control arm mounts • Lighter than original (2.16 lbs) • Fewer corners mean fewer stress concentrations • Easier to machine Upright Upright Specs Total Weight: 2.16 lbs Material: Al 6061-T6 Yield Strength: 31,183 psi (215 Mpa) Weight by Part: Upright: 2.02 lbs Mounts: 0.07 lbs e. Control Arm Mounts Load Transfer Cornering Full Simulation Maximum load transfer onto the upright due to acceleration. Lateral force on upright due to turning. Simulation of both the load transfer and lateral force applied to upright due to turning Max von Mises Stress: 14.3 Mpa (2059.5 psi) Factor of Safety: 19.29 Max von Mises Stress: 56.1 Mpa (8136.6 psi) Factor of Safety: 4.9 Max von Mises Stress: 57 Mpa (8267.2 psi) Factor of Safety: 4.82 Current Accomplishments: Researched different intake styles and chose the most efficient style Created and revised design in SolidWorks Completed flow analysis Ordered materials for intake 11 Intake Research Exhaust Research determined that a spherical collector upright intake was the most efficient design (1). The taper of the cone collector should be between 3-7 degrees (2). Optimal runner length of 250-325mm (3). 20 mm FSAE mandated restrictor (2) Research Typical stock exhaust uses small diameter crush bent pipe or mandrel bent pipe. ◦ Crush bents are easier and cheaper to make however reduce the flow by 50%. ◦ To produce the most power exhaust should have minimal restriction on the exact flow. Components: 4 headers and silencer canister (muffler) (3) (1) 12 13 Analysis o Bernoulli’s equation provides accurate pressure drop calculations o Air Flow velocites obtained by SolidWorks to check for choked flow o Flow rates can be calculated to compare the theoretical volumetric efficiency o Real world Flow Bench testing in the future to determine actual volumetric efficiency 𝑷𝟏 𝒗𝟐𝟏 − 𝒗𝟐𝟐 𝑷𝟐 = 𝝆𝟐 × + 𝝆𝟏 𝟐 Choked Flow 𝒄= 𝜸𝑹∗ 𝑻 𝑅𝑎𝑖𝑟 𝑅∗ = 𝑀𝑎𝑖𝑟 𝜸=1.4 (for air) 14 Analysis ◦ FloXpress provides flow through one intake runner at a time ◦ Testing in SolidWorks using the pressure drop calculations ◦ Goal is to verify when restriction chokes engine air flow. ◦ Choked flow only after 11000 RPM -Airflow through the intake at 9500 RPM -RPM at which max power was previously recorded -Airflow through the intake at 11000 RPM, when choke flow begins 15 Total Estimated Cost $217.04 16 -Runners made of pieced together prebent mandrel tube -Flanges laser cut by Bauer Compressor of Norfolk -Collector rolled from flat aluminum sheet -Restriction turned from solid aluminum round 17 Accomplishments ◦ Finite Element Analysis Patran and Nastran ◦ 5 loading cases ◦ CBAR (1D) Mat. Prop. 4031 Annealed Steel Various Diameters 18 19 Factor of Safety: 4.17 20 21 Factor of Safety: 4.0 22 23 Factor of Safety: 17.6 24 **Forces from Statically Loaded case also included in this analysis** 25 Factor of Safety: .015 26 **Forces from Statically Loaded case also included in this analysis** **Same Total Force Used from Frontal Impact** 27 Factor of Safety: .016 28 29