/SKEW/MOV

Format

Definitions

Comments

1. Moving skew defines a local coordinate system, defined by three nodes. At each time, the actual orientation of the skew is recalculated according to the actual position of these nodes.
2. For moving skews, the skew system is moving and is defined by node identifiers node_ID₁, node_ID₂ and node_ID₃.
   The axis definition depends on the input for Dir.

   • When Dir=X

     node_ID₁ amd node_ID₂ define $X\text{'}$

     node_ID₁ and node_ID₃ define $Y"$

     • $Z\text{'}=X\text{'}\Lambda Y"$
     • $Y\text{'}=Z^{\prime }\Lambda X^{\prime }$

     
     
     Figure 1. Moving System with Dir=X

   • When Dir=Y

     node_ID₁ and node_ID₂ define $Y\text{'}$

     node_ID₁ and node_ID₃ define $Z"$

     • $X\text{'}=Z^{″}\Lambda Y^{\prime }$
     • $Z\text{'}=X^{\prime }\Lambda Y^{\prime }$

     
     
     Figure 2. Moving System with DIR=Y

   • Case Dir=Z

     node_ID₁ and node_ID₂ define $Z\text{'}$

     node_ID₁ and node_ID₃ define $X"$

     • $Y^{\prime }=X^{″}\Lambda Z^{\prime }$
     • $X^{\prime }=Y^{\prime }\Lambda Z^{\prime }$
     The skew is defined by $X\text{'}$ , $Y\text{'}$ and $Z\text{'}$

     
     
     Figure 3. Moving System with DIR=Z

3. When defining some conditions with respect to the skew in cylindrical coordinate system, the axis of the cylindrical coordinate system is assumed to pass through node N1.