Parking Brake Calculations

# Calculating Static Friction (for an 8 inch rotor)
import math

#variables
m = 297 #kg
g = 9.81 #m/s^2
r_wheel = 0.2792 #m
r_rotor_effective = 0.0857504 #m
mu = 0.42


ff_max = m*g*math.sin(0.191986)
ff_bp = (ff_max*r_wheel)/r_rotor_effective 
f_clamp = ff_bp/mu 
t_brake_req = ff_bp * r_rotor_effective
t_brake_per_wheel = t_brake_req/2

print(f"Braking torque required per wheel is {t_brake_per_wheel}")

# Calculating Actual Braking Torque Achieved (for an 8 inch rotor)

braking_radius_in = 3.376
lever_force_lbs = 80

t_brake_actual = 2.69*braking_radius_in*lever_force_lbs
t_brake_nm = t_brake_actual*(0.11298482933333)

print(f'Theoretical braking torque generated per wheel is {t_brake_nm} N/m')

# Calculations for ASC Regulation 10.6A (must be able to withstand pushing force of 10% of vehicles weight when parking brake is activated)

m = 297 #kg

f_push = 0.1*m*9.81
effective_rotor_radius = 0.0857504 #m

t_brake_actual = 164.1703917601402 #N/m per wheel

f_brake = t_brake_actual / effective_rotor_radius

print(f"Braking force generated is {f_brake} per wheel")