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

Hi Berniw,

I think i were not very clear in my last email, but what i want to say is
that the *problem* of high changes  *disappear* when the car moves *only for
* ( *tita*  , car2-trb1) car. *While* for the other cars (*bt* , car2-trb1
and *berniw2*, "FOCW61) it  *always* *exist*  (at low and high speeds).

Anyway tomorrow i will try to print the suspension...

Thank you very much


On Thu, Mar 14, 2013 at 9:40 PM, Bernhard Wymann <[email protected]> wrote:

> 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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