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expression gains filter and such...
Posted: Mon Sep 26, 2016 5:09 pm
by bomber
https://forum.flightgear.org/viewtopic.php?f=4&t=30529
Code: Select all
<filter>
<name>Door L1</name>
<type>gain</type>
<gain>1</gain>
<update-interval-secs type="double">0.05</update-interval-secs>
<input>
<expression>
<table>
<property>/controls/doors/L1-i</property>
<entry><ind>0</ind><dep>-80</dep></entry>
<entry><ind>1</ind><dep> 80</dep></entry>
</table>
</expression>
</input>
<output>/controls/doors/L1-o</output>
</filter>I've not seen this done before, so can someone point me to any documentation (not holding my breath) or explain this and any more like this I don't know about ?
Maybe we could create a library of these little gems ?
regards
Simon
Re: expression gains filter and such...
Posted: Mon Sep 26, 2016 5:13 pm
by IAHM-COL
Re: expression gains filter and such...
Posted: Mon Sep 26, 2016 5:15 pm
by Octal450
I used them in this file in MD-80s, to make custom values.
https://github.com/it0uchpods/MD-88/blob/master/Systems/engine-timing.xmlThey are basically gain filters with custom values.
Wiki not very helpful sadly.
I can help
Re: expression gains filter and such...
Posted: Mon Sep 26, 2016 5:52 pm
by bomber
Can I take it these are Flightgear XML 'extensions' for want of a better word and not native JSBsim XML ?
Re: expression gains filter and such...
Posted: Mon Sep 26, 2016 6:24 pm
by Octal450
It's autopilot/property rule xml
Re: expression gains filter and such...
Posted: Mon Sep 26, 2016 6:50 pm
by bomber
yes and that property is outside of the JSBsim property tree....
But what we have here are xml functions.. such as the filter
and others
However these are not anywhere to be found in the JSBsim manual...
And as I do flight models in both flightgear and Outerra I can only use xml functions that are JSBsim if I want an easy transfer from one to the other.
Simon
Re: expression gains filter and such...
Posted: Mon Sep 26, 2016 7:39 pm
by OPFOR77
Yes, these are FG specific, not related to JSBSim.
You can do the same thing as the first bit you posted in JSBSim with a table and clamping the output.
Re: expression gains filter and such...
Posted: Mon Sep 26, 2016 7:39 pm
by Octal450
I don't understand why you are saying JSBsim.
This is a FlightGear XML based expression gain filter...
Re: expression gains filter and such...
Posted: Mon Sep 26, 2016 7:41 pm
by IAHM-COL
@Josh,
he would just love to be able to use the <filter> options within JSBsim. Which AFAIK, no way.
Re: expression gains filter and such...
Posted: Mon Sep 26, 2016 7:56 pm
by Octal450
Yeah.