Hello Everyone!
We are final year Mechanical Engineering students from Vishwakarma Institute of Technology, Pune. Currently, We are working on the problem statement of ‘Brake System Design for Formula Student Race Car.’
For development of this project we are using SOLIDWORKS, CATIA Part Design, CATIA Assembly Design and Mechanical System Design. Initially, for design of the different parts of the system we have referred to the model given below.
Fig. 1. FSAE Car Model for Reference
From this model the kerb weight of the car is 223 kg and Center of Gravity is 0.294 m is taken.
For initial Design calculations we have taken as Car is stationary on the road such that dynamic load on each wheel is distributed equally.
Fig.2. Weight Transfer Diagram
- RA = Normal Reaction on Front Wheel
- RB = Normal Reaction on rear Wheel
- a = Acceleration
- h = height of center of Gravity from ground
- b = Wheelbase
- m = mass of vehicle
- W = Weight of Vehicle
First, after applying brakes mass transfer of the car is calculated by using formula (m*a*h)/b in which m is the mass of car, a is acceleration, h is height of Centre of gravity of car and b is wheelbase. After calculating mass transfer, weight transfer is calculated by multiplying it by acceleration due to gravity. Weight Transfer of front wheel is 1508.75 N and for rear wheel is 678.87 N. Normal load on each of front and rear wheel is 754.38 N and 339.43 N respectively.
Fig. 3. Force on Disc
In the above figure, F1 is the frictional force in the road and tire, R is the radius of tire, r is the radius of brake disc and F2 is the Braking force in between disc and brake pads. By equating the torque Braking force calculation is done. Braking force for front two wheels is 2607.52 N and for real wheel is 1173.26 N. After that by using Pascal’s law force on caliper and master cylinder is calculated and finally Pedal force Calculation is done that is 39.65 Kg. and brake biasing is 68.96%.
Excel Parameters and Calculations:
Students Involved
@VJ
Edu
