Challenge

Week 7 Challenge

Traction Force:

Forces act on vehicle while it's going against the slope.

Fa = Aerodynamic Drag

Fr = Rolling Resistance

Fg = Grade Resistance

Forces act on vehicle while it's going along the slope.

Here we have designed a simulink model where traction force and total resistances are calculated.

We know that, F=m*a

a = F/m

Here F= Traction force - Total resistance

Now we will go through the model [with all susbsytems]

Blocks Used:

The entire model with the above requirements is:

Inside the driver block:

Inside Vehicle Model:

All the resistive forces are fed to a sum block and have been subtracted from the traction force to get the actual force.

**atan block is used to convert angle in degrees to radians as MATLAB couldn't analyse the input in degrees.

Data fed in to the signal builder:

Parameter change done for blocks:

Enabled "External Reset" as level to reset the "integrator" block while vehicle comes to rest position.
Accel saturation block is set to "1-upperlimit and 0-lowerlimit" as acceleration would en positive all the time.
Brake saturation block is set to "0-upperlimit and -1-lower limit" as braking is a negative phenomenon.

Rolling Resistance function block:

**Interpreted function block should be used for MATLAB 2021a and above versions

Aerodynamic Drag Block:

Grade Resistance:

Here we supplied actual force to Vehicle by "Traction force - Total Resistive Forces = Actual Force"

Variables taken in to consideration:

M = 1900

Frontal Area = 2.86

Drag Coeff = 0.4170

Roll Coeff = 0.15

Grade = 1

g = 9.81

Density of air = 1.13

Output of the model:

Ship work like this
in your own course.