I need to change the lateral friction coefficient of the tire. I modified the .tir file, but the change didn’t have any effect. I’m not sure what the correct procedure is to apply these changes.
Hi @PedroNeto,
What type of tire model are you using?
Why do you need to modify this parameter?
Hope this helps!
Adam Reid
estou calculando o torque do volante para girar e preciso estudar como o coeficiene influencia
It looks like you are trying to complete either the nPost or KnC standard event. For these events, the tire is not in contact with a road surface (RDF, etc.), but rather it is constrained at the contact patch to the post with a joint. Therefore, changes you make to the tire model friction coefficients will not be realized.
To study this change in steering effort when completing something like a dry static steer event, you will need a few things: Tires capable of capturing the Turn-Slip characteristics and a custom event.
For the event, you will need to use the Default Event, constrain the vehicle in a similar manner (vehicle body to ground), and rotate the steering where with a Motion to achieve a similar sequence of events but this time incorporate the road file.
For the tire model, you will need to be using a tire model that can enable a use mode that ends in a 5, such as 115 (shown from a MF-SWIFT tire model example):
! USE_MODE specifies the type of calculation performed: ! 0: Fz only, no Magic Formula evaluation ! 1: Fx,My only ! 2: Fy,Mx,Mz only ! 3: Fx,Fy,Mx,My,Mz uncombined force/moment calculation ! 4: Fx,Fy,Mx,My,Mz combined force/moment calculation ! 5: Fx,Fy,Mx,My,Mz combined force/moment calculation + turnslip ! +0: steady state behaviour ! +10: including relaxation behaviour ! +20: including relaxation behaviour (nonlinear) ! +30: including rigid ring dynamics ! +100: smooth road contact ! +200: smooth road contact (circular cross section, motorcycles) ! +400: road contact for 2D roads (using travelled distance) ! +500: road contact for 3D roads ! ! example: USE_MODE = 434 implies: ! -combined slip ! -rigid ring dynamics ! -road contact for 2D roads
Turn-slip requires extra licensing, so if you are not equipped to enable this use mode then you will be unable to use the above workflow.
