RC...

[Nick Haman]

Hello all,



I'm using Flightgear to simulate a UAV control system. Does anyone know
where I can get an RC model for Flightgear?



--Nick Haman

[Sam Heyman]

Post by Nick Haman
Hello all,
I’m using Flightgear to simulate a UAV control system. Does anyone
know where I can get an RC model for Flightgear?
--Nick Haman

Hi there

Yes I am working on it as well. So far I have simulated a standard
Futaba servo, with a second order transfer function that I got off the
Internet
(http://roger.ecn.purdue.edu/~andrisan/Courses/AAE451%20Fall2000/Servo.html).
This is what it looks like in the XML file:

<COMPONENT NAME="Futaba Servo" TYPE="SECOND_ORDER_FILTER">
INPUT fcs/elevator-control-aug
C1 0
C2 0
C3 950
C4 1
C5 40
C6 950
OUTPUT fcs/elevator-pos-rad
</COMPONENT>

The output of the servo is the elevator (or control surface) position in
radians. This needs to be in the range +/- 0.5 rad. However, with this
model I am getting over 1 rad!

I am beginning to think that a better model would be a simple first
order filter with the rise time and gain of a servo...

let me know if this helps at all...
Sam




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[Nick Haman]

Thanks Sam,

It sounds like you're trying to model the control system response times.
I'm not looking for anything this complex. I'd be happy with a flying
RC model of a 40 or 60 size trainer. I have a working autopilot and I'd
like to try to get the PID gains close before an actual flight.





-----Original Message-----
From: flightgear-flightmodel-***@lists.sourceforge.net
[mailto:flightgear-flightmodel-***@lists.sourceforge.net] On Behalf Of
Sam Heyman
Sent: Monday, February 20, 2006 10:31 AM
To: flightgear-***@lists.sourceforge.net
Subject: Re: [Flightgear-flightmodel] RC...

Post by Nick Haman
Hello all,
I'm using Flightgear to simulate a UAV control system. Does anyone
know where I can get an RC model for Flightgear?
--Nick Haman

Hi there

Yes I am working on it as well. So far I have simulated a standard
Futaba servo, with a second order transfer function that I got off the
Internet
(http://roger.ecn.purdue.edu/~andrisan/Courses/AAE451%20Fall2000/Servo.h
tml).
This is what it looks like in the XML file:

<COMPONENT NAME="Futaba Servo" TYPE="SECOND_ORDER_FILTER">
INPUT fcs/elevator-control-aug
C1 0
C2 0
C3 950
C4 1
C5 40
C6 950
OUTPUT fcs/elevator-pos-rad
</COMPONENT>

The output of the servo is the elevator (or control surface) position in

radians. This needs to be in the range +/- 0.5 rad. However, with this
model I am getting over 1 rad!

I am beginning to think that a better model would be a simple first
order filter with the rise time and gain of a servo...

let me know if this helps at all...
Sam




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This SF.net email is sponsored by: Splunk Inc. Do you grep through log
files
for problems? Stop! Download the new AJAX search engine that makes
searching your log files as easy as surfing the web. DOWNLOAD SPLUNK!
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=103432&bid=230486&dat=121642
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for problems? Stop! Download the new AJAX search engine that makes
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