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From: virtue on 21 Nov 2009 04:29
Hi,

I am dealing with a vehicle dynamics model with a fuzzy logic steer
control. Model equations are in the form of differential equations of
the motions. The problem is, I am getting the below message pointing
out the singularity. (I have tried to reduce the step size but it
didn't work out. Strange thing for me is, if I give longitudinal
velocity 15 m/s and high, (for a particular maneouvre) it works... If
the speed is below 15 m/s it gives this message... Any idea would be
appreciated. Thanks..

virtue
...................................
Derivative input 1 of '......./3 DOF/VEHICLE MODEL/Yaw Motion/
velocity' at time 4.450147717014402e-309 is Inf or NaN. Stopping
simulation. There may be a singularity in the solution. If not, try
reducing the step size (either by reducing the fixed step size or by
tightening the error tolerances).
..................................................
From: virtue on 21 Nov 2009 11:48
On 21 Kasım, 11:29, virtue <virtu...(a)gmail.com> wrote:
> Hi,
>
> I am dealing with a vehicle dynamics model with a fuzzy logic steer
> control. Model equations are in the form of differential equations of
> the motions. The problem is, I am getting the below message pointing
> out the singularity. (I have tried to reduce the step size but it
> didn't work out. Strange thing for me is, if I give longitudinal
> velocity 15 m/s and high, (for a particular maneouvre) it works... If
> the speed is below 15 m/s it gives this message... Any idea would be
> appreciated. Thanks..
>
> virtue
> ..................................
> Derivative input 1 of '......./3 DOF/VEHICLE MODEL/Yaw Motion/
> velocity' at time 4.450147717014402e-309 is Inf or NaN.  Stopping
> simulation.  There may be a singularity in the solution.  If not, try
> reducing the step size (either by reducing the fixed step size or by
> tightening the error tolerances).
> .................................................

I solved the problem guys. It was silly... Just an Initial condition
block forgotten somewhere...
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