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Re: [Paparazzi-devel] Parameter identification


From: gatib
Subject: Re: [Paparazzi-devel] Parameter identification
Date: Thu, 5 Sep 2013 21:52:29 +0200
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Hi Reto,

your experience is very interesting. I was afraid that I won't be able to
perform trimmed flight manually, and this will cause low confidence in the
result. I'll try it next time.

Regards,
Balazs

> Hi Balazs
>
> The ZHAW (Switzerland) identified the airframe stability parameters in
> manual flight by analyzing the Paparazzi flight logs. The airframe
> resonance frequencies can be measured by flying nicely trimmed straight
> and
> level and giving a short manual disturbance in the according axis.
>
> To measure the pitch resonance frequency you give a short impulse on the
> elevator and then measure the frequency of the airplanes nose going up and
> down. That works same for the yaw axis using the rudder. The roll axis is
> a
> bit more difficult, as it is not stable on many airframes and the
> oscillation mixes with the other axes.
>
> Regards
> Reto
>
>
>
> 2013/9/5 Balazs GATI <address@hidden>
>
>> Hi all,
>>
>> we are using TWOG for 4 years, and now we would like to use it for
>> identification of control and stability derivatives. My strategy would
>> be
>> the following:
>> - level flight in AUTO2
>> - when the flight seems steady, test engineer clicks on a button on the
>> GCS
>> - then TWOG:
>>     - measures the trim position of the controls
>>     - opens loop (controls fixed in trim position)
>>     - adds predefined control inputs (i.e doublet) to trimm values
>>     - closes loop after predefined seconds
>>
>> I would be pleased if you could confirm whether this procedure can be
>> realized by editing the flight plan only. (I would like to avoid
>> changing
>> the source code.)
>>
>> Regards,
>>   Balazs
>>
>>
>> --
>> Balazs GATI, PhD
>>      Department of Aeronautics, Naval Architecture and Railway Vehicles
>>      Budapest University of Technology and Economics
>>
>> Address:   Budapest
>>           Stoczek u 6. J. ép. 423
>>           1111
>> Tel:       +(36)-1-463-1960
>> Fax:       +(36)-1-463-3080
>> Homepage: http://rht.bme.hu/~gatib/
>>
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>>
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