Re: [Paparazzi-devel] Tuning the vertical loop for rotorcraft fw

[Eduardo lavratti]

Hello Felix, i continue tunnig the guidance_v

When in hover it hold altitude ... not perfect but work. Need more tune.
When in NAV or att_z the altitude not hold good.

If i do command to right and stay to right for some seconds, when i release the stick the rotorcraft goes up +- 20 meter, some times more than 30 then is goes slowly to correct altitude.
in NAV the same occur.

Today i changing the motor and props of my rotorcraft. i send the logs as soon as possible,

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Date: Thu, 10 Jan 2013 16:35:40 +0100
From: address@hidden
To: address@hidden
Subject: Re: [Paparazzi-devel] Tuning the vertical loop for rotorcraft fw

Hi Christoph,

for testing/debugging the control it makes sense to set a fixed NOMINAL_HOVER_THROTTLE (disables the adaptive "mass" estimation) to make sure this doesn't get messed up by vibrations, etc...

I guess you looked at the altitude and _velocity_ estimates to check if they make sense? What about them if you move the quad up/down 1.5m by hand?

Could you maybe provide the logfiles of one of these tests?

Cheers, Felix

On Thu, Jan 3, 2013 at 6:26 PM, Christoph Niemann <address@hidden> wrote:

Hi everybody and a happy new year!

Currently I'm doing my first steps tuning a rotrcraft. The ATT loop
seems to work well but I'm experiencing problems in tuning the
vertical loop. To do so I took my airframe into a hall with a ceiling
allowing to fly about six meters high without being disturbed by wind
and also not to fly in the ground effect.
So far I'm trying to do this in the Attitude Z Hold Mode. In my
opinion I should activate it and then give full throttle to allow the
controller to control the height. To have compareable results I
allways the set the altitide setpoint to a determined value.
What happens when I engange it? It gives to much thrust and fly up to
the ceiling until it reduce the thrust and get It back. You can the
the pattern in the enlosed plot.
I have no clue what to do. I played around with the contoller values
and tried for instance puttin everything to "0". By increasing the
pgain again a valiue of lets say 80 is enough to reproduce the
behavior again. I also tried to set the nominal throttle by hand, I
think with very few success.
Now I have no idea. Which values should I have a look at? What could
be the problem? Did I missunderstand something?
What I've got to say its a pretty old Paparazzi
(v4.0_stable-13-gcca26bb-dirty) but currently I can't update it, since
the Hardware is pretty beta, but the hw shouldn't be the problem,
since the z value seems ok to me.

Kind regards and thank you for your help

Christoph

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