Simscape vehicle model starts to decelerate even there is no input

In " Tire Parameterization and Performance " model, when I changed the Torque input to 0, vehicle stars to move in negative direction even if there seems no external input to the vehicle. What might be the reason and solution for this. Thanks.

Answer 1

[Ayush]

Hi Volkan,

I understand that you want to know why the vehicle in the “Tire Parameterization and Performance” model starts moving in the negative direction even when the torque input to 0.

The primary reason for the above problem is the “Gravitational acceleration” parameter in the “Vehicle Body” block being set to 9.81 m/s^s by default. This parameter acts on the vehicle at its center of gravity by providing acceleration due to the gravitational forces which leads to resulting velocity and movement in the negative direction. Please refer to the below documentation to know more about the “Vehicle Body” block:

https://www.mathworks.com/help/sdl/ref/vehiclebody.html?s_tid=doc_ta

You can find the following block in the model using the path below:

TireParameterAndPerformance/Vehicle Body

To resolve the issue, you can set the “Gravitational acceleration” parameter to 0, which would nullify its effect on the vehicle which has zero torque. Please find the screenshots below to set the parameter to 0 and its resultant scope representation.

Hope it helps,

Regards,

Ayush Misra