Hello,
First off: What a freaking great FF implementation. I first tried it right
before going to bed, and since I have to work I could not sit up all night.
Guess what, I really couldn't sleep, I was too e***d, just like the first
time i raced go-kart.
But i have encoutered some funny behaviour. Not so funny actually, it's
completely logic, but it sure was strange. It's just another statement of how
brilliant the physics in GPL is.
Try running slow at a straight and stay off the trottle. Give the FF wheel a
little tap to the left or right and let it go. It then starts to waggle back
and forth with increasing amplitude until the car hits something and the
steering goes back to normal. Before the car hits something you get too worried
about the wheel so you stop it yourself.
The reason for this is that the front tires turn angle depends on the angle of
the wheel, and the wheel's angle depends on the angle of the tires. When the
wheel gets a little tap, the forces of the moving tire is trying to straighten
out the wheel, and then the wheel doesn't stop soon enough and gets pushed
in the opposite direction, and here we go. It's a underdamped system. I
hope despite my bad english this is understandable.
The question is : Should i try to andjust the damping or the sync-number to
fix this ? From wave-physics this is called a underdamped system, so maybe I
should increase the damping, or is that too theoretical ?
--
Olav K. Malmin
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