JSBSim airship_added_mass system: Updated to support JSBSim external moments.
This commit is contained in:
Anders Gidenstam
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1 changed files with 75 additions and 17 deletions
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@ -2,7 +2,7 @@
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Airship added/virtual mass model for JSBSim.
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Copyright (C) 2008 - 2014 Anders Gidenstam (anders(at)gidenstam.org)
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Copyright (C) 2008 - 2018 Anders Gidenstam (anders(at)gidenstam.org)
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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@ -35,12 +35,15 @@
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Define the following properties:
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aero/constants/volume-ft3
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aero/constants/length-diameter-ft2 (length^2 + diameter^2)
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aero/constants/added-mass/k-axial
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aero/constants/added-mass/k-traverse
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aero/constants/added-mass/k-rotational
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aero/constants/added-mass/tweak-factor (1.0 is the standard value)
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aero/constants/added-mass/k-axial (all three are positive but
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aero/constants/added-mass/k-transverse can be entered as negative
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aero/constants/added-mass/k-rotational for backwards compatibility)
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aero/constants/added-mass/tweak-factor (1.0 is the standard value)
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Define the following external forces:
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aero/constants/added-mass/k-traverse (old misspelling, can be given
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to work with older FlightGear)
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Define the following external forces and moments:
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<force name="added-mass-bx" frame="BODY">
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<location unit="">
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@ -73,6 +76,31 @@
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</direction>
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</force>
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<moment name="added-mass-pitch" frame="BODY" unit="LBSFT">
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<direction>
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<x> 0.0 </x>
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<y> 1.0 </y>
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<z> 0.0 </z>
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</direction>
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</moment>
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<moment name="added-mass-roll" frame="BODY" unit="LBSFT">
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<direction>
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<x> 1.0 </x>
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<y> 0.0 </y>
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<z> 0.0 </z>
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</direction>
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</moment>
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<moment name="added-mass-yaw" frame="BODY" unit="LBSFT">
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<direction>
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<x> 0.0 </x>
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<y> 0.0 </y>
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<z> 1.0 </z>
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</direction>
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</moment>
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The old deprecated force based external moment implementation below is still
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supported.
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<force name="added-mass-pitch[0]" frame="BODY">
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<location unit="">
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<x> AERORP X </x>
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@ -145,14 +173,32 @@
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</channel>
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<property>aero/constants/added-mass/k-transverse</property>
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<property>aero/constants/added-mass/k-traverse</property>
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<channel name="backward-compatibility">
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<!-- Allow vehicles still using the old misspelled k-traverse coefficient. -->
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<switch name="aero/constants/added-mass/k-transverse-final">
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<default value="aero/constants/added-mass/k-transverse"/>
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<test logic="AND" value="aero/constants/added-mass/k-transverse">
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aero/constants/added-mass/k-transverse NE 0.0
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</test>
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<test logic="AND" value="aero/constants/added-mass/k-traverse">
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aero/constants/added-mass/k-traverse NE 0.0
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</test>
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</switch>
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</channel>
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<channel name="translational">
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<fcs_function name="aero/added-mass/force-bx-lbs">
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<function>
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<product>
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<value>-1.0</value>
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<property> aero/added-mass/active </property>
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<property> atmosphere/rho-slugs_ft3 </property>
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<property> aero/constants/added-mass/k-axial </property>
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<abs><property> aero/constants/added-mass/k-axial </property></abs>
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<property> aero/constants/volume-ft3 </property>
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<property> accelerations/udot-ft_sec2 </property>
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</product>
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@ -163,9 +209,10 @@
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<fcs_function name="aero/added-mass/force-by-lbs">
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<function>
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<product>
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<value>-1.0</value>
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<property> aero/added-mass/active </property>
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<property> atmosphere/rho-slugs_ft3 </property>
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<property> aero/constants/added-mass/k-traverse </property>
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<abs><property> aero/constants/added-mass/k-transverse-final </property></abs>
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<property> aero/constants/volume-ft3 </property>
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<property> accelerations/vdot-ft_sec2 </property>
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</product>
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@ -176,9 +223,10 @@
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<fcs_function name="aero/added-mass/force-bz-lbs">
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<function>
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<product>
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<value>-1.0</value>
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<property> aero/added-mass/active </property>
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<property> atmosphere/rho-slugs_ft3 </property>
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<property> aero/constants/added-mass/k-traverse </property>
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<abs><property> aero/constants/added-mass/k-transverse-final </property></abs>
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<property> aero/constants/volume-ft3 </property>
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<property> accelerations/wdot-ft_sec2 </property>
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</product>
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@ -194,9 +242,9 @@
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<function>
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<product>
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<property> aero/added-mass/active </property>
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<value> 0.05 </value>
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<value>-0.05 </value>
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<property> atmosphere/rho-slugs_ft3 </property>
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<property> aero/constants/added-mass/k-rotational </property>
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<abs><property> aero/constants/added-mass/k-rotational </property></abs>
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<property> aero/constants/volume-ft3 </property>
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<property> aero/constants/length-diameter-ft2 </property>
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<property> accelerations/qdot-rad_sec2 </property>
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@ -208,9 +256,9 @@
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<function>
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<product>
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<property> aero/added-mass/active </property>
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<value> 0.05 </value>
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<property> aero/constants/added-mass/k-rotational </property>
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<value>-0.05 </value>
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<property> atmosphere/rho-slugs_ft3 </property>
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<abs><property> aero/constants/added-mass/k-rotational </property></abs>
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<property> aero/constants/volume-ft3 </property>
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<property> aero/constants/length-diameter-ft2 </property>
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<property> accelerations/rdot-rad_sec2 </property>
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@ -218,23 +266,33 @@
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</function>
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</fcs_function>
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<pure_gain name="aero/added-mass/pitch-moment-force-lbs[0]">
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<pure_gain name="aero/added-mass/pitch-moment/moment-lbsft">
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<input>aero/added-mass/pitch-moment-lbsft</input>
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<gain>1.0</gain>
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<output>external_reactions/added-mass-pitch/magnitude-lbsft</output>
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</pure_gain>
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<pure_gain name="aero/added-mass/pitch-moment/force-lbs[0]">
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<input> aero/added-mass/pitch-moment-lbsft </input>
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<gain>-0.5</gain>
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<output> external_reactions/added-mass-pitch[0]/magnitude </output>
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</pure_gain>
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<pure_gain name="aero/added-mass/pitch-moment-force-lbs[1]">
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<pure_gain name="aero/added-mass/pitch-moment/force-lbs[1]">
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<input> aero/added-mass/pitch-moment-lbsft </input>
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<gain>0.5</gain>
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<output> external_reactions/added-mass-pitch[1]/magnitude </output>
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</pure_gain>
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<pure_gain name="aero/added-mass/yaw-moment-force-lbs[0]">
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<pure_gain name="aero/added-mass/yaw-moment/moment-lbsft">
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<input>aero/added-mass/yaw-moment-lbsft</input>
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<gain>1.0</gain>
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<output>external_reactions/added-mass-yaw/magnitude-lbsft</output>
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</pure_gain>
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<pure_gain name="aero/added-mass/yaw-moment/force-lbs[0]">
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<input> aero/added-mass/yaw-moment-lbsft </input>
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<gain>-0.5</gain>
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<output> external_reactions/added-mass-yaw[0]/magnitude </output>
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</pure_gain>
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<pure_gain name="aero/added-mass/yaw-moment-force-lbs[1]">
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<pure_gain name="aero/added-mass/yaw-moment/force-lbs[1]">
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<input> aero/added-mass/yaw-moment-lbsft </input>
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<gain>0.5</gain>
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<output> external_reactions/added-mass-yaw[1]/magnitude </output>
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