This information is part of the Modelica Standard Library maintained by the Modelica Association.

Vehicles vehicle and vehicle1 are accelerated and decelerated by a driving torque. Nominal torque is defined as the sum of driving resistances at nominal velocity vNom times wheel radius R.

Starting at 5 s, the vehicle is accelerated by a multiple of nominal torque until it nearly reaches nominal velocity, then driven by nominal torque. Between 20 s and 25 s, an inclination of 5 % occurs and driving torque is increased to a multiple of nominal torque temporarily. Between 50 s and 55 s, the driving torque is set below zero, causing the vehicle to decelerate. After 55 s, the vehicle decelerates due to the driving resistances.

Coupling the trailer with the same data but without drive, the driving torque of vehicle1 has to be doubled to achieve the same acceleration and velocity. Force and power between the two vehicles is measured.

Note

Since the trailer is coupled tightly with the vehicle1, initialization of the trailer has to be removed.

m	Value: 100 Type: Mass (kg) Description: Mass of vehicle
R	Value: 0.25 Type: Length (m) Description: Radius of wheel
A	Value: 1 Type: Area (m²) Description: Cross section of vehicle
Cd	Value: 0.5 Type: Real Description: Drag resistance coefficient
rho	Value: 1.18 Type: Density (kg/m³) Description: Density of air
vWind	Value: 0 Type: Velocity (m/s) Description: Constant wind velocity
Cr	Value: 0.01 Type: Real Description: Rolling resistance coefficient
inclination	Value: 0 Type: Real Description: Constant inclination = tan(angle)
vNom	Value: 25 / 3.5 Type: Velocity (m/s) Description: Nominal velocity
fDrag	Value: Cd * A * rho * (vNom - vWind) ^ 2 / 2 Type: Force (N) Description: Drag resistance
alpha	Value: atan(inclination) Type: Angle (rad) Description: Inclination angle
fRoll	Value: Cr * m * g_n * cos(alpha) Type: Force (N) Description: Roll resistance
fGrav	Value: m * g_n * sin(alpha) Type: Force (N) Description: Grav resistance