Procedure

 

Chassis:

  1. Model of the chassis was made using modeling software like Catia with the aim being to maximize torsional rigidity.
  2. Finite element analysis was done using Ansys. The results were used to optimize the orientation of members such that torsional rigidity is maximized.
  3. A few iterations of validation using Ansys were done till the desired results were obtained.

 Suspension:

  1. Suspension geometry was determined using Catia after many iterations were done to optimize the given parameters.

a)      Maximize roll centre height.

b)      Minimize change in roll centre height during wheel travel.

c)      Minimize camber change.

d)      Accommodate the suspension within the given space.

  1. Suspension stiffness was determined after many iterations to optimize the give parameters.

a)      Minimize suspension stiffness as it is an all terrain vehicle.

b)      Minimize roll gradient.

c)      Achieve the target ratio for front suspension frequency and rear suspension ratio.

  1. Suspension travel was determined using the value of stiffness of the spring.
  2. Dynamic roll characteristics were simulated using MATLAB. We made a program (it was a model of a car during roll) to simulate the same.
  3. Hubs and uprights were made such that they can bear loads during off-road activities.
  4. Damping ratio for shock absorbers suitable for our car was found. After some elimination and assumptions we pick a stock damper suitable for our car.

Steering geometry:

  1. The steering axis inclination (kingpin inclination, castor angle, scrub radius and mechanical trail) was determined to optimize the given parameters.

a)            Have favourable dynamic camber change.

b)            Have suitable steering effort allowing the driver to get sufficient feel while turning while not making the effort            too much.

c)            Allow slight adjustments of camber.

2.  Ackermann geometry was determined using Catia to minimize understeer of the vehicle.

 

Brakes:

  1. Target deceleration was determined.
  2. Stock brakes and brake cylinders were selected.

 Engine:

  1. The organizers provide a 340 c.c. Lombardini engine.
  2. No modifications to the engine are allowed.

 Transmission:

1.      A gearbox from a motorcycle will be used as the torque characteristics are suitable for our car.

2.      It will be coupled with some parts of the Mahindra Alpha gearbox to account for a reverse gear.

3.      We probably will not be able to have paddle shift but this could be done if a motorcycle gearbox is used.

 

 

 

 

 

 

 

 

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