<!DOCTYPE OMNotebook>
<Notebook>
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   <TextCell style="Title" >
    <Text>&lt;html>&lt;head>&lt;meta name="qrichtext" content="1" />&lt;/head>&lt;body style=" white-space: pre-wrap; font-family:MS Shell Dlg; font-size:8.25pt; font-weight:400; font-style:normal; text-decoration:none;">&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:Arial; font-size:38pt; font-weight:600; color:#000000;">Connections&lt;/p>&lt;/body>&lt;/html></Text>
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    <TextCell style="Section" >
     <Text>&lt;html>&lt;head>&lt;meta name="qrichtext" content="1" />&lt;/head>&lt;body style=" white-space: pre-wrap; font-family:MS Shell Dlg; font-size:8.25pt; font-weight:400; font-style:normal; text-decoration:none;">&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:Times; font-size:18pt; font-weight:600; color:#000000;">General Description&lt;/p>&lt;/body>&lt;/html></Text>
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    <TextCell style="Text" >
     <Text>&lt;html>&lt;head>&lt;meta name="qrichtext" content="1" />&lt;/head>&lt;body style=" white-space: pre-wrap; font-family:MS Shell Dlg; font-size:8.25pt; font-weight:400; font-style:normal; text-decoration:none;">&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:Times New Roman; font-size:12pt; color:#000000;">&lt;span style=" font-style:italic;">Connections&lt;/span> between components can be established between &lt;span style=" font-style:italic;">connectors&lt;/span> of &lt;span style=" font-style:italic;">equivalent type&lt;/span>. The names must be identical. And corresponding types of declared &lt;span style=" font-style:italic;">variable members&lt;/span> in the classes of the connectors must be equivalent, but the ordering between the member declarations in the connector classes need not be the same. It is important to note that connections can only be established between connectors (instances of &lt;span style=" font-family:Courier New;">connector&lt;/span> classes). Instances of the restricted classes &lt;span style=" font-family:Courier New;">record, block, model, function&lt;/span> and &lt;span style=" font-family:Courier New;">package&lt;/span> are not allowed in connections.&lt;br />&lt;br />In connectors there are two kinds of variables, either non-flow variables that represents som kind of potential enegy level (ex. Voltage) or flow variables, with the prefix flow, that represents some kind of flow (ex. electric current). &lt;/p>&lt;/body>&lt;/html></Text>
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    <TextCell style="Section" >
     <Text>&lt;html>&lt;head>&lt;meta name="qrichtext" content="1" />&lt;/head>&lt;body style=" white-space: pre-wrap; font-family:MS Shell Dlg; font-size:8.25pt; font-weight:400; font-style:normal; text-decoration:none;">&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:Times; font-size:18pt; font-weight:600; color:#000000;">Connect Statements&lt;/p>&lt;/body>&lt;/html></Text>
    </TextCell>
    <TextCell style="Text" >
     <Text>&lt;html>&lt;head>&lt;meta name="qrichtext" content="1" />&lt;/head>&lt;body style=" white-space: pre-wrap; font-family:MS Shell Dlg; font-size:8.25pt; font-weight:400; font-style:normal; text-decoration:none;">&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:Times New Roman; font-size:12pt; color:#000000;">Connections between connectors are realized as equations in Modelica. Note that &lt;span style=" font-family:Courier New;">connect&lt;/span> statements are regarded as &lt;span style=" font-style:italic;">equations&lt;/span> despite the fact that the syntax is different from normal equations. The reason is that &lt;span style=" font-family:Courier New;">connect&lt;/span> statements are eventually expanded into normal equations. The general form of a &lt;span style=" font-family:Courier New;">connect&lt;/span> statement is as follows:&lt;/p>&lt;/body>&lt;/html></Text>
    </TextCell>
    <TextCell style="" >
     <Text>&lt;html>&lt;head>&lt;meta name="qrichtext" content="1" />&lt;/head>&lt;body style=" white-space: pre-wrap; font-family:MS Shell Dlg; font-size:8.25pt; font-weight:400; font-style:normal; text-decoration:none;">&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-size:8pt;">&lt;span style=" font-family:Times New Roman; font-size:12pt; color:#000000;">                    connect(connector1, connector2)&lt;/span>&lt;/p>&lt;/body>&lt;/html></Text>
     <Rule name="TextAlignment" >Left</Rule>
    </TextCell>
    <TextCell style="Text" >
     <Text>&lt;html>&lt;head>&lt;meta name="qrichtext" content="1" />&lt;/head>&lt;body style=" white-space: pre-wrap; font-family:MS Shell Dlg; font-size:8.25pt; font-weight:400; font-style:normal; text-decoration:none;">&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:Times New Roman; font-size:12pt; color:#000000;">The two arguments of a &lt;span style=" font-family:Courier New;">connect&lt;/span> statement must be references to connectors, each of which either has to be declared within the same class where the &lt;span style=" font-family:Courier New;">connect&lt;/span> statement occurs, or has to be a member of one of the declared variables in that class.&lt;/p>&lt;/body>&lt;/html></Text>
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   </GroupCell>
   <GroupCell closed="false" >
    <TextCell style="Section" >
     <Text>&lt;html>&lt;head>&lt;meta name="qrichtext" content="1" />&lt;/head>&lt;body style=" white-space: pre-wrap; font-family:MS Shell Dlg; font-size:8.25pt; font-weight:400; font-style:normal; text-decoration:none;">&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:Times; font-size:18pt; font-weight:600; color:#000000;">Electrical Connections&lt;/p>&lt;/body>&lt;/html></Text>
    </TextCell>
    <TextCell style="Text" >
     <Text>&lt;html>&lt;head>&lt;meta name="qrichtext" content="1" />&lt;/head>&lt;body style=" white-space: pre-wrap; font-family:MS Shell Dlg; font-size:8.25pt; font-weight:400; font-style:normal; text-decoration:none;">&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:Times New Roman; font-size:12pt; color:#000000;">Now we connect the two connectors &lt;span style=" font-family:Courier New;">Pin1&lt;/span> and &lt;span style=" font-family:Courier New;">Pin2&lt;/span> using a connect statement. The class &lt;span style=" font-family:Courier New;">ConnectedPins&lt;/span> connects the two pins so that they form one node. This produces two equations, namely: &lt;span style=" font-family:Courier New;">pin1.v = pin2.v and pin1.i + pin2.i = 0&lt;/span>. The first says that the voltages at the connected wire ends are the same (&lt;span style=" font-style:italic;">equality coupling&lt;/span>). The second equation corresponds to Kirchhoff's current law saying that the currents &lt;span style=" font-style:italic;">sum to zero&lt;/span> at a node .&lt;br />&lt;/p>&lt;/body>&lt;/html></Text>
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     <Input>class ConnectedPins
  Modelica.Electrical.Analog.Interfaces.Pin pin1;
  Modelica.Electrical.Analog.Interfaces.Pin pin2;
equation
  connect(pin1, pin2);
end ConnectedPins;
</Input>
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     <Text>&lt;html>&lt;head>&lt;meta name="qrichtext" content="1" />&lt;/head>&lt;body style=" white-space: pre-wrap; font-family:MS Shell Dlg; font-size:8.25pt; font-weight:400; font-style:normal; text-decoration:none;">&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:Times New Roman; font-size:12pt; color:#000000;">&lt;img src="file:///C:/OpenModelica132/bin/OMNoteboook_tempfiles/2.png" width="501" height="84" />&lt;/p>&lt;/body>&lt;/html></Text>
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     <Text>&lt;html>&lt;head>&lt;meta name="qrichtext" content="1" />&lt;/head>&lt;body style=" white-space: pre-wrap; font-family:MS Shell Dlg; font-size:8.25pt; font-weight:400; font-style:normal; text-decoration:none;">&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-size:8pt;">&lt;span style=" font-family:Times New Roman; font-size:12pt; color:#000000;">Connecting two electrical pins. The connected voltages are equal, and the sum of the corrents is zero.&lt;/span>&lt;/p>&lt;/body>&lt;/html></Text>
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    <TextCell style="Section" >
     <Text>&lt;html>&lt;head>&lt;meta name="qrichtext" content="1" />&lt;/head>&lt;body style=" white-space: pre-wrap; font-family:MS Shell Dlg; font-size:8.25pt; font-weight:400; font-style:normal; text-decoration:none;">&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:Times; font-size:18pt; font-weight:600; color:#000000;">Mechanical Connections&lt;/p>&lt;/body>&lt;/html></Text>
    </TextCell>
    <TextCell style="Text" >
     <Text>&lt;html>&lt;head>&lt;meta name="qrichtext" content="1" />&lt;/head>&lt;body style=" white-space: pre-wrap; font-family:MS Shell Dlg; font-size:8.25pt; font-weight:400; font-style:normal; text-decoration:none;">&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:Times New Roman; font-size:12pt; color:#000000;">The &lt;span style=" font-style:italic;">filled&lt;/span> and &lt;span style=" font-style:italic;">non-filled&lt;/span> squares of a component represent &lt;span style=" font-style:italic;">mechanical flanges&lt;/span>. We connect these flanges using a &lt;span style=" font-family:Courier New;">connect&lt;/span> statement so that they form one node:&lt;/p>&lt;/body>&lt;/html></Text>
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    <InputCell style="Input" closed="true" >
     <Input>class ConnectedFlanges
Modelica.Mechanics.Translational.Interfaces.Flange_a flange1,flange2;
equation
connect (flange1, flange2); 
end ConnectedFlanges;</Input>
     <Output></Output>
    </InputCell>
    <TextCell style="Text" >
     <Text>&lt;html>&lt;head>&lt;meta name="qrichtext" content="1" />&lt;/head>&lt;body style=" white-space: pre-wrap; font-family:MS Shell Dlg; font-size:8.25pt; font-weight:400; font-style:normal; text-decoration:none;">&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:Times New Roman; font-size:12pt; color:#000000;"> &lt;/p>&lt;/body>&lt;/html></Text>
    </TextCell>
    <TextCell style="Text" >
     <Text>&lt;html>&lt;head>&lt;meta name="qrichtext" content="1" />&lt;/head>&lt;body style=" white-space: pre-wrap; font-family:MS Shell Dlg; font-size:8.25pt; font-weight:400; font-style:normal; text-decoration:none;">&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:Times New Roman; font-size:12pt; color:#000000;">&lt;br />Which connects the two flanges so that they form one node. This produces two equations, namely: &lt;span style=" font-family:Courier New;">flange1.s = flange2.s&lt;/span> and &lt;span style=" font-family:Courier New;">flange1.f + flange2.f = 0&lt;/span>.&lt;br /> &lt;/p>&lt;/body>&lt;/html></Text>
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     <Text>&lt;html>&lt;head>&lt;meta name="qrichtext" content="1" />&lt;/head>&lt;body style=" white-space: pre-wrap; font-family:MS Shell Dlg; font-size:8.25pt; font-weight:400; font-style:normal; text-decoration:none;">&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:Times New Roman; font-size:12pt; color:#000000;">&lt;img src="file:///C:/OpenModelica132/bin/OMNoteboook_tempfiles/3.png" width="501" height="84" />&lt;/p>&lt;/body>&lt;/html></Text>
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     <Text>&lt;html>&lt;head>&lt;meta name="qrichtext" content="1" />&lt;/head>&lt;body style=" white-space: pre-wrap; font-family:MS Shell Dlg; font-size:8.25pt; font-weight:400; font-style:normal; text-decoration:none;">&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-size:8pt;">&lt;span style=" font-family:Times New Roman; font-size:12pt; color:#000000;">Connecting two mechanical flanges. The positions at the connection point are identical and the sum of the forces are zero.&lt;/span>&lt;/p>&lt;/body>&lt;/html></Text>
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