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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,
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.
Hope this helps!
Adam Reid
What type of tire model are you using?
Why do you need to modify this parameter?
estou calculando o torque do volante para girar e preciso estudar como o coeficiene influencia
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