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Auto Architects V3
Baja SAE India 2013 Go Green
» Our team consists of 20 members from different disciplines.
» 1 Industrial Engineer » 13 Mechanical Engineer » 2 Electrical Engineer » 2 Instrumentation Engineer
» Our faculty advisor is Dr. Umashankar
INTRODUCTION
TEAM ALLOCATION
» Captain, Vice Captain, Driver, Co-driver, Spokesperson, Treasurer, Technical Coordinator, Marketing, Purchase, Design, Manufacturing, Web Manager, Validation and Aesthetics.
» Engine » Transmission » Roll Cage » Power
Transmission
» Suspension » Brakes » Steering » Electrical
Transmission
MANAGEMENT TECHNICAL
SAE BAJA Rulebook (2013) Important Parameters
Objective : To Design, Simulate and Fabricate a rugged and economical ATV
Design Parameters Rulebook 2013 Auto Architects V3
Rear Roll Hoop (RRH) Min 29’’ at 27’’ 34”
RRH angle to vertical Max ±200 100
Height above driver seat Min 41’’ 41.5”
Dist. Of RHO from driver seat Min 12’’ 27.46”
Angle subtended by front bracing member Max 450 440
Maximum width of the vehicle 64’’ 57.31”
Height of SIM above the seat 8-14” 10.5”
Table 1 : Comparison of parameters in SAE BAJA Rulebook 2013 with Auto Architects V3
Other important restrictions
The vehicle should be a Two Wheel Drive. All the four wheels should lock at the same time while braking.
The steel used for the roll cage should have a minimum of 0.18% of Carbon. Safety of the driver is the first priority.
Target Performance Specifications
Table 2 : Target Performance Specifications with Conditions assumed and Critical values
Other important targets
We also target to reduce our emission level as compared to previous year. Weight of the vehicle including driver weight would be less than 350Kgs.
Enhanced safety of the driver and of the pit crew.
Performance Parameters Conditions assumed Critical Values
Maximum Speed 4th gear Champion Alpha gear box 59.2 kmph
Uphill Climb Total weight 350Kg. and μ=0.5 Up to 50o
Maximum Acceleration 0 to 50 kmph in 5 seconds 2.7 m/s
Minimum Turning Radius At a speed of 8 kmph 2.2 m
Technical Specifications
Table 3 : Design parameters and Specifications
Important Operational Aspects
Design Parameters Specifications
Weight 350 Kg. (including drivers weight)
Length Width Height 90” 62” 66”
Wheel Base 78’’
Wheel Track 53’’
Ground Clearance 11’’
Maximum Wheel Travel Front : 10” Rear : 6”
Tire Size Front : 22” X 7” Rear : 23” X 10”
Centre of Gravity
130cms horizontal from middle of lower member of RRH and 60 cms above the vehicle base
Rear Engine
Rear Wheel Drive
Two Wheel Steering
Rack and Pinion Steering
Front Disc Brakes
Rear Drum Brakes
Mathematical Calculations
Steering Geometry
Weight transfer during incline
Turning Circle Radius
Outer Front Wheel 4.62 m
Inner Front Wheel 3.10 m
Suspension and Steering System
Suspension System
Steering System
Front Suspension : Double A shaped parallel wishbone with minimum un-sprung to sprung mass ratio. Rear Suspension : Trailing arm and Inclined Strut. Maximum Wheel Travel : 8”
Functions of Suspension Road Isolation Road Holding
Cornering
Centrally mounted rack and pinion steering system with a larger steering wheel to be used. The steering
column will be linked with universal joints.
Drafts of the AA-V3 ATV
Perspectives of the AA-V3 ATV
Roll cage Finite Element Analysis
Condition : Rear face is constrained and a load of 5000N is applied at 2 nodes of front face.
Maximum Stress : 103.59 Mpa Maximum Displacement : 0.76 mm
FRONT IMPACT
Roll cage Finite Element Analysis
Condition : LFAS is constrained and a load of 5000N is applied at the at four points of right face.
Maximum Stress : 0.0019061MPa Maximum Displacement : 0.66mm
OVERHEAD IMPACT
Stress analysis using Strain Gauge Model and Strain Gauge Details
Material Mild Steel
Diameter 6 mm
Welding Gas
Scaling ratio 1 : 4.23
Type Foil
Make Vishay , USA
Gauge Resistance 350 Ω
Gauge factor 2.17
Bonding element Cyano acrylate
Material Constantan
Bridge Quarter
Load Vo STRAIN
10Kg 0.05 0.0205
20Kg 0.12 0.0206
30Kg 0.16 0.0207
40Kg 0.27 0.0213 Ε = ( 4 X E0/Ei (Initial voltage) X (Gain Factor))
FORMULA USED
Ei = 5 volts Gain Factor = 2.17
Maximum Strain = 0.165x 10^-3 after applying 50kg of load.
Maximum stress from FEA results = 0.27x10^-3 N/m2
Ergonomic Analysis of Roll cage
Ergonomic analysis has been done keeping safety, comfort, ease of use, performance and aesthetics in mind. An exact replica of roll cage was made
from 1” PVC pipes cut at required size and held together by M-SEAL.
Innovations for a green ATV
Catalytic Converter Electrostatic Precipitator
It is a pollution control device which converts harmful NOx & CO into N2 &
CO2 respectively. Consists of ceramic structures coated with
platinum, rhodium and/or palladium. Reduction and oxidation chambers are
present separately.
Installed towards the rear end of the exhaust. It has two electrodes:
* Aluminum coated on inner surface * Copper wires made along the length of tube.
Input : 8KV to 15KV High potential difference is
set up between the electrodes, which attracts CO2 and CO gas molecules.
Distance between electrodes : 5 to 10 mm.
Project Plan for 4000 ATV’s
We have features for every step of the way
CONCEPTUAL
PHASE
DEVELOPMENT
PHASE
IMPLEMENTATION PHASE
•Team formation • Work distribution
• Identification of resources • Progress review through
group meetings
•Design: Modeling and Analysis • Checking the feasibility of the
model using strain gauges • Comparing both Analysis and
Experimental results
•Sponsorship • Locating sources for
material and other parts • Purchasing material
and required parts • Assembly
• Validation and testing
Any Queries?
THANK YOU