2015-03-28 05:59:29 +00:00
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<?xml version="1.0" encoding="UTF-8"?>
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<PropertyList>
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<debug>true</debug>
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<!-- Some filters are useful when tuning the parameters, but not needed in
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production aircraft. They're tagged DEVELOP and disabled by default. -->
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<!-- limit time step -->
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<filter>
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<type>gain</type>
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<gain>1.</gain>
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<output>/sim/systems/wingflexer/delta-sec</output>
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<input>
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<property>/sim/time/delta-sec</property>
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</input>
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<max>0.05</max>
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</filter>
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<!-- fuselage z (up) acceleration in m/s^2
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we get -g in unaccelerated flight, and large negative numbers on touchdown -->
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<filter>
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<type>gain</type>
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<gain>1.</gain>
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<output>/sim/systems/wingflexer/a-fuselage-mps2</output>
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<input>
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<expression>
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<product>
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<property>/accelerations/pilot/z-accel-fps_sec</property>
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<value>0.3048</value> <!-- FT2M -->
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</product>
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</expression>
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</input>
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</filter>
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<!-- compute k and d -->
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<filter>
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<type>gain</type>
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<gain>1.</gain>
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<output>/sim/systems/wingflexer/k</output>
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<input>
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<expression>
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<product>
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<property>/sim/systems/wingflexer/params/K</property>
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<property>/sim/systems/wingflexer/params/m-wing-dry-kg</property>
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</product>
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</expression>
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</input>
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</filter>
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<filter>
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<type>gain</type>
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<gain>1.</gain>
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<output>/sim/systems/wingflexer/d</output>
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<input>
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<expression>
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<product>
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<property>/sim/systems/wingflexer/params/D</property>
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<property>/sim/systems/wingflexer/params/m-wing-dry-kg</property>
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</product>
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</expression>
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</input>
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</filter>
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<!-- lift force. Convert to N and use 1/2 (one wing only) -->
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<filter>
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<type>gain</type>
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<gain>1.</gain>
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<output>/sim/systems/wingflexer/f-lift-N</output>
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<input>
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<expression>
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<product>
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<property>/sim/systems/wingflexer/params/lift-node-lbs</property>
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<product>
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<property>/environment/gravitational-acceleration-mps2</property>
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<value>0.226796</value> <!-- LB2KG / 2-->
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</product>
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</product>
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</expression>
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</input>
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</filter>
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<!-- z_ofs = g * mass_dry_kg / k -->
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<filter>
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<type>gain</type>
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<gain>1.</gain>
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<output>/sim/systems/wingflexer/z-ofs-m</output>
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<input>
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<expression>
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<div>
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<product>
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<property>/environment/gravitational-acceleration-mps2</property>
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<property>/sim/systems/wingflexer/params/m-wing-dry-kg</property>
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</product>
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<property>/sim/systems/wingflexer/k</property>
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</div>
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</expression>
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</input>
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</filter>
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<!--
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compute total mass of one wing, using the average fuel mass in all wing tanks.
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The weighting factor should be lumped into fuel_frac.
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mass = mass_dry_kg + fuel_frac * sum_i (fuel_node_i_kg)
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-->
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<filter>
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<type>gain</type>
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<gain>1.</gain>
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<output>/sim/systems/wingflexer/m-wing-kg</output>
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<input>
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<expression>
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<sum>
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<property>/sim/systems/wingflexer/params/m-wing-dry-kg</property>
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<product>
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<property>/sim/systems/wingflexer/params/fuel-frac</property>
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<sum>
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<property>/sim/systems/wingflexer/params/fuel-node-1-kg</property>
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<property>/sim/systems/wingflexer/params/fuel-node-2-kg</property>
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<property>/sim/systems/wingflexer/params/fuel-node-3-kg</property>
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<property>/sim/systems/wingflexer/params/fuel-node-4-kg</property>
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</sum>
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</product>
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</sum>
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</expression>
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</input>
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</filter>
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<!-- integrate the ODE -->
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<filter>
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2015-04-07 12:01:58 +00:00
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<type>damped-oscillation</type>
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2015-03-28 05:59:29 +00:00
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<output>/sim/systems/wingflexer/z-raw-m</output>
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<a>
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<expression>
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<div>
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<property>/sim/systems/wingflexer/d</property>
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<property>/sim/systems/wingflexer/m-wing-kg</property>
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</div>
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</expression>
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</a>
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<b>
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<expression>
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<div>
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<property>/sim/systems/wingflexer/k</property>
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<property>/sim/systems/wingflexer/m-wing-kg</property>
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</div>
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</expression>
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</b>
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<c>
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<expression>
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<difference>
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<div>
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<property>/sim/systems/wingflexer/f-lift-N</property>
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<property>/sim/systems/wingflexer/m-wing-kg</property>
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</div>
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<property>/sim/systems/wingflexer/a-fuselage-mps2</property>
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</difference>
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</expression>
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</c>
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<!-- DEVELOP: initialize the wing's vertical velocity to a given value,
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overriding all previous computations -->
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<input>
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<expression>
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<product>
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<property>/sim/systems/wingflexer/sink-rate-fps</property>
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<value>0.3048</value> <!-- feet to meters -->
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</product>
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</expression>
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</input>
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</filter>
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<filter>
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<type>gain</type>
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<output>/sim/systems/wingflexer/z-m</output>
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<!--<gain>1.</gain> -->
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<!-- DEVELOP: scaled output. For production aircraft, this should be done in
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the model animation. -->
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<gain><property>/sim/systems/wingflexer/params/z-fac</property></gain>
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<input>
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<expression>
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<sum>
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<property>/sim/systems/wingflexer/z-raw-m</property>
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<property>/sim/systems/wingflexer/z-ofs-m</property>
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</sum>
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</expression>
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</input>
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</filter>
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<!-- DEVELOP: reset sink rate -->
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<filter>
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<type>gain</type>
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<gain>0.</gain>
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<output>/sim/systems/wingflexer/sink-rate-fps</output>
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</filter>
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<!-- DEVELOP: log max z-m -->
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<filter>
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<type>gain</type>
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<gain>1.</gain>
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<output>/sim/systems/wingflexer/z-max-m</output>
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<input>
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<expression>
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<max>
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<property>/sim/systems/wingflexer/z-max-m</property>
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<abs>
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<property>/sim/systems/wingflexer/z-m</property>
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</abs>
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</max>
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</expression>
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</input>
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</filter>
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</PropertyList>
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