F-15 Emergency gear logic

gistfile1.txt

<!-- 
2. emergency handle

- normal operation (emergency handle retracted).
  : requires hyds
  : cannot retract on ground
  
  parts:
    uplock
    downlock
    door
    bogeys
    
    uplock downlock modelled as single lock -ve for downlock 0 for unlocked, 1 for uplocked
    
emerg operation.
: handle pulled. hyds & electrics cut
-->
        <!-- Deplete the JFS store-->
        <switch name="systems/hydraulics/emerg-gear-unlocked">
            <default value="0"/>
            <test value="1">
                systems/hydraulics/util-system-accumulator-psi gt 200
                gear/emergency-handle gt 0.7
                gear/unit[0]/locked ne 0
            </test>
            <test value="systems/hydraulics/emerg-gear-unlocked">
                gear/emergency-handle gt 0.7
            </test>            
        </switch>
        <switch name="systems/hydraulics/emerg-gear-bleed">
            <default value="0"/>
            <test value="10000">
                systems/hydraulics/emerg-gear-unlocked ne 0
                gear/unit[0]/locked ne 0
            </test>
        </switch>

        <switch name="gear/unit[0]/locked">
            <default value="-1"/>
            <test value="0">
                systems/hydraulics/emerg-gear-unlocked ne 0
                <!-- unlocked when handle pulled -->
                gear/emergency-handle gt 0.7
                gear/emerg-pos lt 1
            </test>
            <test value="0">
                <!-- unlocked. -->
               gear/gear-pos-norm gt 0
               gear/gear-pos-norm lt 1
            </test>
            <test value="1">
               gear/gear-pos-norm le 0
            </test>
            <test value="-1">
               gear/gear-pos-norm ge 1
            </test>
        </switch>
        <switch name="gear/unit[1]/locked">
            <default value="-1"/>
            <test value="0">
                <!-- unlocked when handle pulled -->
                <!-- should deplete the JFS store-->
                gear/emergency-handle gt 0.7
                gear/emerg-pos lt 1
            </test>
            <test value="0">
                <!-- unlocked. -->
               gear/gear-pos-norm gt 0
               gear/gear-pos-norm lt 1
            </test>
            <test value="1">
               gear/gear-pos-norm le 0
            </test>
            <test value="-1">
               gear/gear-pos-norm ge 1
            </test>
        </switch>
        <switch name="gear/unit[2]/locked">
            <default value="-1"/>
            <test value="0">
                <!-- unlocked when handle pulled -->
                <!-- should deplete the JFS store-->
                gear/emergency-handle gt 0.7
                gear/emerg-pos lt 1
            </test>
            <test value="0">
                <!-- unlocked. -->
               gear/gear-pos-norm gt 0
               gear/gear-pos-norm lt 1
            </test>
            <test value="1">
               gear/gear-pos-norm le 0
            </test>
            <test value="-1">
               gear/gear-pos-norm ge 1
            </test>
        </switch>
        <switch name="gear/emerg-pos">
            <default value="gear/emerg-pos-dmd"/>
        </switch>
        <fcs_function name="gear/emerg-pos-dmd">
            <function>
                <ifthen>
                    <and>
                        <ge>
                            <property>gear/emergency-handle</property>
                            <value>0.9</value>
                        </ge>
                        <or>
                            <eq>
                                <property>gear/unit[0]/locked</property>
                                <value>-1.0</value>
                            </eq>
                            <and>
                                <eq>
                                    <property>contact/unit[9]/WOW</property>
                                    <value>0</value>
                                </eq>
                                <eq>
                                    <property>contact/unit[10]/WOW</property>
                                    <value>0</value>
                                </eq>
                            </and>
                        </or>
                    </and>
                    <sum>
                        <property>gear/emerg-pos</property>
                        <ifthen><not><property>gear/unit[0]/locked</property><value>1.0</value></not>
                            <table>
                                <independentVar lookup="row">gear/emerg-pos</independentVar>
                                <independentVar lookup="column">accelerations/Nz</independentVar>
                                <tableData>
                                               -3.0     0.0     0.5     1.0     1.2     2.0     5.0    10.0
                                   -0.00001  0.00000 0.00100 0.00000 0.00090 0.00090 0.00090 0.00090 0.00400
                                    0.0     -0.00400 0.00000 0.00000 0.00090 0.00090 0.00090 0.00090 0.00400
                                    0.90     0.00000 0.00000 0.00000 0.00090 0.00090 0.00090 0.00090 0.00400
                                    0.98     0.11000 0.00000 0.00000 0.00000 0.00000 0.09000 0.11090 0.00400
                                    1.0      0.00000 0.00000 0.00000 0.00090 0.00090 0.00090 0.00090 0.00400
                                </tableData>
                            </table>
                            <value>0</value>
                    </ifthen>
                    </sum>
                    <value>0</value>
                </ifthen>
            </function>
        </fcs_function>