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Revise NWS steer - now linearly reduces to zero after 20 knots, correct max steer angle to 75 deg

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This commit is contained in:
Jonathan Redpath 2019-01-02 14:52:38 +00:00
parent 3a6a0f2eee
commit 2d65e94d0e
2 changed files with 72 additions and 13 deletions
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83
Systems/a320-fcs.xml
View file

@ -1869,23 +1869,82 @@
</test>
</switch>
<fcs_function name="hydraulics/tiller/function">
<fcs_function name="hydraulics/tiller/steer-input">
<function>
<table>
<independentVar lookup="row">/velocities/groundspeed-kt</independentVar>
<independentVar lookup="column">hydraulics/tiller/switch</independentVar>
<tableData>
-1 0 1
30.000 -70.0 0 70.0
30.001 -10.0 0 10.0
</tableData>
</table>
<product>
<value>75</value>
<property>hydraulics/tiller/switch</property>
</product>
</function>
</fcs_function>
<fcs_function name="hydraulics/tiller/function-spd-L">
<function>
<product>
<sum>
<product>
<value>-0.016667</value>
<difference>
<property>/velocities/groundspeed-kt</property>
<v>20</v>
</difference>
</product>
<value>1</value>
</sum>
<property>hydraulics/tiller/steer-input</property>
</product>
</function>
<clipto>
<min>-75</min>
<max> 0</max>
</clipto>
</fcs_function>
<fcs_function name="hydraulics/tiller/function-spd-R">
<function>
<product>
<sum>
<product>
<value>-0.016667</value>
<difference>
<property>/velocities/groundspeed-kt</property>
<v>20</v>
</difference>
</product>
<value>1</value>
</sum>
<property>hydraulics/tiller/steer-input</property>
</product>
</function>
<clipto>
<min> 0</min>
<max> 75</max>
</clipto>
</fcs_function>
<switch name="hydraulics/tiller/steer-cmd">
<test logic="OR" value="0">
position/wow eq 0
</test>
<test logic="AND" value="hydraulics/tiller/steer-input">
/velocities/groundspeed-kt LE 20.000
position/wow eq 1
</test>
<test logic="AND" value="hydraulics/tiller/function-spd-L">
/velocities/groundspeed-kt GT 20.000
position/wow eq 1
hydraulics/tiller/steer-input LT 0
</test>
<test logic="AND" value="hydraulics/tiller/function-spd-R">
/velocities/groundspeed-kt GT 20.000
position/wow eq 1
hydraulics/tiller/steer-input GT 0
</test>
</switch>
<actuator name="fcs/steer-deg">
<input>hydraulics/tiller/function</input>
<rate_limit>70</rate_limit>
<input>hydraulics/tiller/steer-cmd</input>
<rate_limit>75</rate_limit>
<output>fcs/steer-pos-deg[0]</output>
</actuator>

2
Systems/a320-ground-reactions.xml
View file

@ -15,7 +15,7 @@
<rolling_friction> 0.02 </rolling_friction>
<spring_coeff unit="LBS/FT"> 30935.5 </spring_coeff>
<damping_coeff unit="LBS/FT/SEC"> 16978.5 </damping_coeff>
<max_steer unit="DEG"> 70 </max_steer>
<max_steer unit="DEG"> 95 </max_steer>
<table name="CORNERING_COEFF" type="internal">
<tableData> <!-- jsbsim-pacejka.py 3.0 0.03 2.85 1.4 1.03 1.4 -->
-90.0 -0.6442985279209775