How can I implement downforce and drag generated from a rear wing into my drag racing model using Simulink/Simscape?

I am trying to expand the Simscape Vehicle with 4-Speed Transmission example to compare time-to-speed of vehicles with and without rear wings. I have attached a screenshot of the vehicle body subsystem below. Within this subsystem, I cannot figure out a way to add an external force function input representing the downforce and drag forces generated from the wing as vehicle speed increases because the lines that I think I want to connect the force input to are conserving (?) lines going to and from conserving ports. The red circle indicates where I think I would like to add in my forces generated by the wing. I would assume the downforce generated acts on the driven tires, thus increasing my normal load and available traction. I still need to figure out where I would add in the drag effects from the wing. I would like to see how the wing affects TTS performance.

Is there a way for me to add this function to the existing model or do I need to generate my own? Would it be wiser to try to recreate the model in Simulink rather than Simscape?

Answer 1

[Steve Miller]

If you wish to mak the downforce increase with speed, one option is to multiply it by a scaling factor that is speed dependent. Below is one method that would work, where the new blocks are highlighted in green.

These kind of tightly coupled physical effects are best done in Simscape where the equations will be solved simultaneously, which is more accurate.

--Steve