Re: [Flightgear-devel] JSBsim C310 crashes the sim on gearretraction.
Where in the code is the gear position (i.e. relative to retracted or
extended) calculated and managed?
Curt.
Tony Peden writes:
On Fri, 2002-02-15 at 01:49, Erik Hofman wrote:
This gets fixed by this patch:
--- /home/erik/src/CVS/fgfs/JSBSim/FGLGear.cpp
Fri Jan 25 21:10:22 2002
+++ FGLGear.cpp Thu Feb 14 11:26:01 2002
@@ -189,9 +189,11 @@
if (isRetractable) {
if (FCS-GetGearPos() 0.01) {
+ FCS-SetGearPos(0.0);
GearUp = true;
GearDown = false;
} else if (FCS-GetGearPos() 0.99) {
+ FCS-SetGearPos(1.0);
GearDown = true;
GearUp = false;
} else {
Well, I wasn't saying this was the cuase of the
problem, just *a*
solution. I figured there might be a counter
somwhere which decreses
GearPos by a certain amount, but the check didn't
catch it being close
to 0.0
Therefore it would en up in an endless loop or
something.
It's possible. Do you notice any problem with the
flaps? (it's the same code:
Well, I got the evidence now:
*** GearPos = 0.0200
*** GearPos = 0.0183
*** GearPos = 0.0167
*** GearPos = 0.0150
*** GearPos = 0.0133
*** GearPos = 0.0117
*** GearPos = 0.0100
*** GearPos = 0.0083
*** GearPos = 0.0067
*** GearPos = 0.0050
*** GearPos = 0.0033
*** GearPos = 0.0017
*** GearPos = 0.
*** GearPos =
-38906661405588607.
But I cant find where this happens. I trecked it down to FGState.cpp
FGState::SetParameter(eParam val_idx, double val) where I printed the
value of val.
Can anybody who has some more knowledge on JSBSim please take a look at it?
I'll look into it tonight or tomorrow.
Erik
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Tony Peden
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We all know Linux is great ... it does infinite loops in 5 seconds.
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Curtis Olson IVLab / HumanFIRST Program FlightGear Project
Twin Cities[EMAIL PROTECTED] [EMAIL PROTECTED]
Minnesota http://www.menet.umn.edu/~curt http://www.flightgear.org
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Re: [Flightgear-devel] JSBsim C310 crashes the sim on gearretraction.
On Thu, 2002-02-14 at 02:39, Erik Hofman wrote:
Alex Perry wrote:
That's the same error I have on the C172 at simulator startup. FYI.
A crash at startup is mostly because of stale objects files hanging
around. I think you should do a make clean in src/FDM/JSBSim and
remove src/FDM/JSBSim.o and try again.
JSBsim C310 crashes the sim on gear retraction.
$PATLA,117.30,119.0,111.80,29.0,266*69
182: GEAR_CONTACT 1
183: Crash Detected
184: GEAR_CONTACT 1
185: Crash Detected
186: GEAR_CONTACT 1
187: Crash Detected
188: GEAR_CONTACT 1
189: Crash Detected
190: GEAR_CONTACT 1
191: Crash Detected
192: GEAR_CONTACT 1
193: Crash Detected
194: GEAR_CONTACT 1
195: Crash Detected
Tile not found (Ok if initializing)
Attempting to schedule tiles for bogus latitude and
longitude. This is a FATAL error. Exiting!
This gets fixed by this patch:
--- /home/erik/src/CVS/fgfs/JSBSim/FGLGear.cpp Fri Jan 25 21:10:22 2002
+++ FGLGear.cpp Thu Feb 14 11:26:01 2002
@@ -189,9 +189,11 @@
if (isRetractable) {
if (FCS-GetGearPos() 0.01) {
+ FCS-SetGearPos(0.0);
GearUp = true;
GearDown = false;
} else if (FCS-GetGearPos() 0.99) {
+ FCS-SetGearPos(1.0);
GearDown = true;
GearUp = false;
} else {
Ths problem is that GearPos is decreased to it lowest maximum value
somewhere in the retraction code.
I suspect there is a check for == 0 where 0.01 would be more apropriate.
Erik
In as far as the gear are concerned, once FCS-GetGearPos() is below
0.01 or above 0.99, the gear are up and locked or down and locked
respectively so FCS-GetGearPos() ceases to have any meaning.
(that's what the code above does)
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We all know Linux is great ... it does infinite loops in 5 seconds.
-- attributed to Linus Torvalds
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