CONN1

Connector ElementCONN1 lets you connect NLFE elements that have nonstructural discontinuity.

Format

<CONN1
       id       = "integer"
       g1       = "integer"
       g2       = "integer"
       conn     = "string"      
      [graph    = "integer"]/>

Attributes

id: Unique identification number.
g1: First grid identification number.
g2: Second grid identification number, $g1 \neq g2$ .
conn: String containing at most 12 characters that describe the connection between the coordinates.4
graph: Post processing flag. Use this flag to control how this element is displayed in the animation H3D. Default for graph is 0. 6.

Example

The example demonstrates the definition of a CONN1 element.

<CONN1 id="1000" g1="101" g2="17" conn="TTTFFFTTTFFF"/>

Comments

This type of element is used to connect between elements that have nonstructural discontinuity. Each connector element of type CONN1 has a unique identification number with respect to other connector elements of the same type.
Grid 1 and 2 must be co-incident. Use CONN2 or CONN3 if this is not the case.
Grid 2 does not need to have full 12 generalized coordinates associated with it. CONN1 establishes up to 12 kinematic relationships of Grid 1 coordinates with respect to Grid 2 coordinates:
(1)
$\begin{array}{l} r_{1} = r_{2} \\ r x_{1} = r x_{2} \\ r y_{1} = r y_{2} \\ r z_{1} = r z_{2} \end{array}$
The letter 'T' in attribute conn indicates the particular kinematic relationship that will be imposed by MotionSolve at all times during the simulation. The attribute conn can have up to 12 'T' (True) or 'F' (False) characters. For example, if conn="TTTFFFFFFFFF", the first three conditions ( $r_{1} = r_{2}$ ) will be imposed and the rest of the conditions (for example, $r x_{1} = r x_{2}$ , $r y_{1} = r y_{2}$ , and $r z_{1} = r z_{2}$ ) will not be imposed by MotionSolve.
The default for the attribute conn is "FFFFFFFFFFFF". Further, conn="TTT" is equivalent to conn="TTTFFFFFFFFF". If the number of characters in the attribute conn is more than the number of generalized coordinates of either Grid 1 or 2, any character which does not have corresponding coordinates in either Grid 1 or 2 will be ignored.
The graph attribute controls how this connector element is displayed in the animation H3D:
- graph ="0" implies the CONN1 element is not represented in the H3D
- graph ="1" impliesthat a line connecting the two nodes will be displayed for this element.