Simcenter 3D Solutions Create MPC Equations in Simcenter 3D

Simcenter Nastran Simcenter 3D



There are two ways to create MPC equations in Simcenter 3D:
  1. Create MPC (constraint) elements
User can create MPC elements explicitly in the FEM file.  In 1D Connection or Element Create dialog box, select the Constraint Equations option from the Type list to create the element between the nodes you select.

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Next, you can define the coefficients for the selected independent degrees-of-freedom in Associated Data or Manage Element Associated Data (both listed under group Elements)

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If you want to constrain all six DOFs for the dependent node, you must create six MPC Elements and the associated Constraint Equations.

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For example, 3 constraint equations are defined in the table for the 3 MPC elements.  The first row for each equation (e.g. rows 2, 9, 16) in the table is the dependent nodes (e.g. 19039, 19045, 19046).  You cannot specify coefficients for the degrees-of-freedom for the dependent node.

User can select the Solver Syntax Preview for any MPC element to see the associated constraint equation (which should be the same as what displayed in the Manage Element Associated Data)

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After you defined the MPC elements in the FEM file, you can apply constraints to these elements in the Simulation file.  Use the Multi MPC option in the Manual Coupling dialog box to constrain selected MPC elements.  Without this step, the MPC equations will not be exported.

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  1. Define MPC (constraint) equations directly
The constraint equations can be defined directly without create MPC elements in the FEM file.  In the Simulation file, use the MPC option in the Manual Coupling dialog box to define the Dependent/Independent nodes and the associated DOFs and coefficients.  Toggle on the Unique DOF Values to define different coefficients for different DOFs.     

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Again, if you want to constrain all six DOFs for the dependent node, you must create six MPC equations.


KB Article ID# KB000040578_EN_US



Associated Components

Other SOL101 SOL103 SOL105 SOL106 SOL107 SOL108 SOL109 SOL110 SOL111-SOL112 SOL144 SOL145 SOL146 SOL153 SOL159 SOL200 SOL401 SOL402 SOL414 SOL601-SOL701 Superelement