[Crrcsim-devel] Wind turbulence model implemented

[<luc...@li...>]

Dear Developers,

After flying a bit more with the wind turbulence model, I noticed a wrong 
behaviour related to the roll-disturbances (they extend for too long a time 
causing the model to continuosly roll towards one side instead of rolling a 
little bit back and forth). Careful inspection revealed that the formulas for 
roll disturbance were wrong in both the documents I was taking as reference 
(one being the MIl Handbook itself...)
I could find a third reference doc were the error is corrected and so have 
fixed the bug, recovering the expected behaviour.
Thus if you want to try wind turbulence don't forget to take this last 
revision.

Regards,

Luca

>----Messaggio originale----
>Da: luc...@li...
>Data: 28/10/2012 23.12
>A: "crrcsim-devel"<crr...@li...>
>Ogg: [Crrcsim-devel] Wind turbulence model implemented
>
>Dear Developers,
>
>I've juste pushed a development of CRRCsim which implements a wind 
turbulence 
>model.
>The model is based on MIL-HDBK-1797 and implements the Dryden digital filter 
>formulation, in particular focusing on the low-altitude model (which is 
valid 
>until at least 1000ft above ground leves, so quite ok for our rc-airplanes).
>
>Turbulence is activated from the wind/thermal dialog by setting the 
>"Turbulence intensity [rel]" to a value > 0. A value of 1 (default) produces 
>the turbulence intensity specified by Dryden model, while value lower/hgher 
>then 1 can be used to tune turbulence intensity to something more 
appropriate 
>for the location (e.g. less turbulence on a slope facing the sea, more 
>turbulence on a slope in the Alps).
>Turbulence intensity is proportional to wind speed, so its effect is much 
more 
>evident in strong winds, as in real life.
>
>Although in ligh to moderate winds the effect of turbulence is not very 
>strong, it seems to me (but I've just debugged it and have not flown a lot 
yet) 
>that it adds quite some realism to the simulation: have a try your self!
>
>Remarks and suggestions are welcome.
>
>Kind regards,
>
>Luca
>

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