[Csp-commits] svn:csp r1201 - in trunk/CSP/CSPSim: . Data/XML/vehicles/aircraft/m2k Include Source

[<sv...@ww...>]

Author: mkrose
Date: 2004-08-06 19:05:39 -0700 (Fri, 06 Aug 2004)
New Revision: 1201

Modified:
   trunk/CSP/CSPSim/CHANGES.current
   trunk/CSP/CSPSim/Data/XML/vehicles/aircraft/m2k/gear.xml
   trunk/CSP/CSPSim/Data/XML/vehicles/aircraft/m2k/model.xml
   trunk/CSP/CSPSim/Include/LandingGear.h
   trunk/CSP/CSPSim/Source/LandingGear.cpp
Log:
Fixed a bug in the landing gear code that omitted lateral damping
of tire oscillations when the wheels were rolling.  Also increased
the tire damping coefficient.

Changed the tire rolling friction to a simdata::Real so that each
wheel spins down at a slightly different rate.  In practice this
isn't very noticible, since the wheels generally leave the ground
at different times, so they will have different initial speeds.

Eliminated the nose-wheel castering routine.  It isn't necessary any
more (high speed taxiing is stable), and made the front wheel appear
to have a very low friction coefficient for lateral sliding at low
speeds.

Increased the static friction coefficient of the tires (they were
skidding too much / for too long).

Improved tire rotation logic: wheels roll backward and forward as
appropriate, tire rotation continues when airborne, damped by
friction and brakes.

Found the cause of mysterious "flips" of the aircraft on the ground.
Turns out it isn't the landing gear physics: gusts of wind from behind
the aircraft (20-30 m/s) are driving very poorly modelled parts of the
"flight" envelope.  No attempt to fix this yet.

Update steering wheel angle in flight now.  Aircraft model can disable
this "manually" if desired (e.g. NWS disengaged when no WOW) by setting
the steering channel to zero.

Removed redundant contol of the aileron/elevators that was causing
conflicts.  If these inputs and control surfaces need to be coordinated,
then a more specialized FCS system should be written.

Adjusted the CM of the M2k forward by 30 cm to put more weight on the
front wheel (reduce skidding when steering) and increase the takeoff
pitchup speed.

Adjusted the vertical height of the M2k nosewheel (6.8 cm) to put it on
the ground.  (Easier to see now that the camera can be panned down to
ground level.)

Added an info line to show when ABS is active.

Reduced the gear damping coefficients slightly.  The front gear is now
slightly underdamped, which agrees with an F-16 cockpit video I've seen.

Browse at: https://www.zerobar.net/viewcvs/viewcvs.cgi?view=rev&rev=1201

Diff omitted (26755 bytes).