01-12-2012, 06:18 PM
SAE BAJA 2012® Tilak Tracers
[attachment=42184]
Introduction
The objective of SAE BAJA since the time of its inception has been to give engineering students an opportunity and a platform to absorb real time design/manufacturing experience as well as face the challenges that come along.
We at team Tilak Tracers aim to capture the title while following the various rules put forth by the SAE.
The car
The car design was appreciated and approved by all the senior members of the team. Ergonomics and aesthetics were taken into consideration to shape the SRP (Seat Reference Point). The HRP (Heel Reference Point) was also fixed and Higher Reference Points were designed.
Steering
The Ackerman Steering system has been chosen for the car since it requires a lower steering ratio as compared to other setups
As per design, the wheelbase is 1796mm the track being 1400mm and the wheel width being 165mm. A turning radius of 2927mm was determined by using Ackerman calculations.
Also the turning angles for the inside and the outside wheels was calculated as 52° and 55° respectively.
The steering box ratio is to be as taken 15:1.
The lengths of the rack & tie rod are 18” and 10” respectively.
The Lateral force on the tyres is 1708.9N = 384lbs and the vertical load is 600lbs which give the following values –
Cornering Stiffness = 100lb/degree
Tyre size designation = C
Camber angle = 0.44°
Castor angle = 5°(-ve)
Toe-in angle = 2°
Braking System and Circuit
Taking a total braking force+ of 3825.9N and deceleration of ‘0.6g’ developed in a response buildup time of with a slip of 20%.
The Inner effective radius to be taken as 180mm and Outer effective radius as 250mm.
Effective(torque) radius calculated to be 108.5mm & braking force distribution by the circuit taken as 34:66 according to weight distribution, we get the braking distance to be 3.69mts and stopping time to be 2.44secs.
Ergonomics
Vehicle safety is not just about driving well and avoiding accidents, a good driving position can make a big difference to health.
Driver ergonomics focuses on the healthy aspects of driving drawing upon biology, psychology, engineering and design to create vehicle environments in which people have a lower chance of injury.
Ergonomics aids - 1) Sitting comfortably , 2) protecting the neck , 3) Positioning the steering wheel , 4) Aiding vision , 5) Driving position and comfort .
[attachment=42184]
Introduction
The objective of SAE BAJA since the time of its inception has been to give engineering students an opportunity and a platform to absorb real time design/manufacturing experience as well as face the challenges that come along.
We at team Tilak Tracers aim to capture the title while following the various rules put forth by the SAE.
The car
The car design was appreciated and approved by all the senior members of the team. Ergonomics and aesthetics were taken into consideration to shape the SRP (Seat Reference Point). The HRP (Heel Reference Point) was also fixed and Higher Reference Points were designed.
Steering
The Ackerman Steering system has been chosen for the car since it requires a lower steering ratio as compared to other setups
As per design, the wheelbase is 1796mm the track being 1400mm and the wheel width being 165mm. A turning radius of 2927mm was determined by using Ackerman calculations.
Also the turning angles for the inside and the outside wheels was calculated as 52° and 55° respectively.
The steering box ratio is to be as taken 15:1.
The lengths of the rack & tie rod are 18” and 10” respectively.
The Lateral force on the tyres is 1708.9N = 384lbs and the vertical load is 600lbs which give the following values –
Cornering Stiffness = 100lb/degree
Tyre size designation = C
Camber angle = 0.44°
Castor angle = 5°(-ve)
Toe-in angle = 2°
Braking System and Circuit
Taking a total braking force+ of 3825.9N and deceleration of ‘0.6g’ developed in a response buildup time of with a slip of 20%.
The Inner effective radius to be taken as 180mm and Outer effective radius as 250mm.
Effective(torque) radius calculated to be 108.5mm & braking force distribution by the circuit taken as 34:66 according to weight distribution, we get the braking distance to be 3.69mts and stopping time to be 2.44secs.
Ergonomics
Vehicle safety is not just about driving well and avoiding accidents, a good driving position can make a big difference to health.
Driver ergonomics focuses on the healthy aspects of driving drawing upon biology, psychology, engineering and design to create vehicle environments in which people have a lower chance of injury.
Ergonomics aids - 1) Sitting comfortably , 2) protecting the neck , 3) Positioning the steering wheel , 4) Aiding vision , 5) Driving position and comfort .