RE: RC...

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: [email protected]
[mailto:[email protected]] On Behalf Of
Sam Heyman
Sent: Monday, February 20, 2006 10:31 AM
To: [email protected]
Subject: Re: [Flightgear-flightmodel] RC...

Nick Haman wrote:

> 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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