presentation on car for SUPRA event
- 1. Team Vega Supra SAE INDIA Student Formula Team JSS Academy of Technical Education, Noida
- 3. Ergonomics and Structure Right Side View Top View Front View
- 4. Material specification: IS 3074 Material specification: ASTM 106b O.D. : 1”. O.D. : 1”. W.T. : 0.065”. W.T. : 0.095”. Youngs’ Modulus : 200 GPa. Youngs’ Modulus : Yield Strength : 373 MPa. Yield Strength : Density : 7860 kg/m3 . Density : 6100 kg/m3 . Materials Options available IS 3074 AISI 4130 ASTM 106 AISI 1018 Material and Design • Optimum level of triangulation and tetragonal design. • Structural side pods for rigidity and side impact safety. • Being light weight but cost effective material. • Compact inclusive of all systems packaging. • High torsional rigidity.
- 5. Analysis & Simulation Sr. no. Test Boundary conditions Force moments Magnitude Von Misses Stress (N/m2) Factor Of safety 1. Static Shear Clamp rear suspension mounts Downward force at front bulkhead 1440 1.08e+008 3.01 2. Static Overall Vertical Bending Clamp- front and rear suspension mounts Uniformly distributed loading 1500 1.48e+008 4.18 3. Static torsional loading Clamp- rear suspension mounts Clockwise Moment at bulkhead side 310 0.79e+008 7.81 4. Front Impact analysis Clamp- front and rear suspension mounts
- 6. Suspension Geometry • Wheel base – 1600mm • Track width – 1300mm • Four wheel independent. • Double A Arm with pushrod actuation on front. • Provides desired motion ratio with easy adjustability. • Max. load is transferred to the springs. • Reduces drag. • Double A Arm with direct acting springs on the rear. • Provides the required stability. • Packaging constraint is dealt with. • Static Roll Centre height of 45mm with FVSA 1731mm. • Static Camber of 2 degree negative.
- 7. Suspension – Linkages, Spring and Damper • Usable wheel travel aimed at 60 mm. • Desired motion ratio of 1:1. • Wheel Rate(N/mm) = Load(N)/Deflection(mm) • Wheel rate • Front – 18.312 N/mm • Rear – 27.468 N/mm • The spring with required stiffness and travel can be determined. • Design criterion for A Arms • Must provide the desired kinematic characteristics. • Strength should be high to bear the required loads with sufficient factor of safety. Force Diagram
- 8. Steering • Minimum turning radius is 2.5meter. • Steering ratio 8:1 was assumed to be good considering both the factors, driver handling as well as fatigue. • Lock to lock angle of wheel is 67.7° • C-factor for given steering system is 120mm. • Selected steering axis inclination for negative scrub radius not more than 10mm was 3° . • Mechanical trail for the front tires is 28mm .
- 9. Other parameters – *Above parameters are at static condition. Brake system • Weight Transfer –
- 10. • Disc brakes(hydraulic) was selected for brake system. • Maximum retardation of the vehicle is “ g”. • Distance travel by car in brake test (40 - 0kmph) is 6.9metre. • Pedal force require to stop the vehicle 207.5N . • Other Parameters –
- 11. • Selected pedal ratio for desire play of brake pedal was 4:1 • Maximum efficiency is 98% for µ=1 and it is 88% for µ=0.7 • Thermal Analysis of rotor- • Maximum Temperature of the disc is 224.57 °C
- 12. Engine & Power train Engine: HONDA CBR 250R Comparison between CBR-250R & RE-500 Selection of Honda CBR-250R over RE-500 • Power to weight ratio • Power band lying in desired rpm range • Low emission level: 1. Secondary air supply system 2. Three way catalytic convertor
- 13. Drive train unit: 6 speed transmission Gear Gear Ratio Tractive Force (N) Acceleration (m/s2) Velocity (m/s) 1 3.33 3443.113 10.43 4.72 2 2.12 2188.909 6.63 7.43 3 1.57 1624.363 4.92 10.02 4 1.31 1348.94 4.08 12.07 5 1.12 1152.87 3.92 14.12 6 0.96 994.627 3.01 16.37 Primary reduction=2.808:1(73/26) Final reduction=4:1(56/14)
- 14. Restrictor design: Converging-Diverging geometry with throat of 15mm. • Optimization of restrictor is carried out to get minimum pressure drop across it. • Numerous iteration were carried out in Ansys fluent as shown below. Maximum mass flow rate: 0.02976 kg/s Mass flow rate for choked condition: 0.0726 kg/s Intake manifold design Static Pressure V/s Position Contours of velocity magnitude (m/s)
- 15. DFMEA & DVP
- 16. Project Management Phase I Design & Fabrication July-November End Semesters (GAP) December Phase II Design & Fabrication January-March Phase III Testing & Optimization April-June
- 17. Cost Plan
- 18. BREAK EVEN ANALYSIS for B-PLAN • Fixed cost, x-units of production, Variable Cost, Selling Price per unit, Total Sale Revenue. • At BEP, x = F/(s-v). OBJECTIVES • Brand establishment. • Exploration and optimization. • Demographic dividend. • Opportunity cost. FLOW OF FUNDS SPONSORSHIPS • POTENTIAL • PART • MONETARY EMI WORKS HOP CONTINGE NGY fUNDS ALLOCATION OF FUNDS
- 19. • Lathe Machine • Shaper Machine • CNC Milling • Milling Machine • Cylindrical Grinding • Surface Grinding • Drilling Machine • TIG Welding • MIG Welding • Gas Welding • Electric Arc Welding • Universal Testing Machine College Facilities
- 20. VEHICLE OVERVIEW Part Specification Overall Length 2640 mm Height 1320 mm Wheelbase 1600 mm Track Width 1300 mm Centre of Gravity Height 250 mm Ground Clearance 89 mm Engine Honda CBR 250R Engine Displacement 249.6 cc Engine Power 25 bhp Transmission 6 speed Constant Mesh Suspension Double A Arms Pushrod Brakes 4 Wheel Disc Brakes