Re: Very high changes in acceleration and wheel forces which is not logical

Hi Alan

Please print out the suspension course, max, and if the SUSP_EXT 
condition kicks in, I bet that is the reason. Review as well the car 
model, in the previous post I mentioned the interesting parameters.

That the noise disappears with growing speed is clear, because at the 
start just the wight of the car is present as main force, so the spring 
is on this magic "cannot extend more" limit. When the car dives faster, 
downforce (wings and ground effect) kicks in, and the suspension gets 
compressed, so relative to the lower actual ride height it can then 
extend a bit, because not operating anymore on the "mechanical limit".

Makes all total sense to me;-)

Best regards

Bernhard

On 03/14/2013 08:34 PM, Alan Ali wrote:
> Hi Berniw,
>
> Thank you very much for your help.
>
> But the problem still exist .
> *
> The changes i made is the followings:*
>
> I put your code from "TORCS Robot tutorial" instead of the drive
> function for the robot
> static void drive(int index, tCarElt* car, tSituation *s)
> {
>      memset(&car->ctrl, 0, sizeof(tCarCtrl));
>
>      float angle;
>      const float SC = 1.0;
>
>      angle = RtTrackSideTgAngleL(&(car->_trkPos)) - car->_yaw;
>      NORM_PI_PI(angle); // put the angle back in the range from -PI to PI
>      angle -= SC*car->_trkPos.toMiddle/car->_trkPos.seg->width;
>
>      // set up the values to return
>      car->ctrl.steer = angle / car->_steerLock;
>      car->ctrl.gear = 1; // first gear
>      car->ctrl.accelCmd = 0.3; // 30% accelerator pedal
>      car->ctrl.brakeCmd = 0.0; // no brakes
> }
>
> and i print the forces of the first wheel as i have already mentioned...
>
> *The expeimenrts :*
>
> i have tested (TORCS 1.3.3,tita3, car1-trb1 on wheel-1) the changes
> exist just at start , and it disapear (smooth force changes) after the
> car moves even without any changes.
>
> But I am using (TORCS 1.3.3 ,bt , car2-trb1 on wheel-1) i have wiped out
> all stuff out of the default xml file for all the cars(
> D:\torcs-1.3.3\runtimed\drivers\bt\ i \default.xml ,   where i =0...9 )
> (keeping the brake part as you told me to do)
> but the problem didn't disaprear...
>
> I have also tested  (TORCS 1.3.3,berniw2, "FOCW61"on wheel-1) and the
> same problem exist.
>   acutally what i made is to replace all the drive funciotn.
>
> i have also replaced the code
> Ft -= F * sx / s;
> Fn -= F * sy / s;
> but it still exist...
>
>
> Thank you very much again and sory for bothering you...
>
>
>


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