MPC

Analysis > Connectors > MPC

This tool is used to create multi point constraint equations between nodes. These nodes should be ideally located at the same location.

Description

  1. MPC can be created between two faces or two nodes or two edges or two bodies having matching nodes within specified tolerance.
  2. Face type (Planar/Cylindrical/All) is used filter face types while creating MPC between bodies.
  3. Edges whose nodes are not needed for MPC creation can be removed using Ignore edges option.
  4. Following configurations of MPC can be created
    • Single to Single

      This option is used to define MPC equation between one dependent and one independent Node. User can also select dependent and independent Edges/Faces. SimLab automatically finds dependent and independent node pairs from the selected faces/edges.

    • Single to Double

      This option is used to define MPC equation between a dependent, an independent and an anchor Node. When this option is used, the user has to select the dependent and independent entities and then select an anchor node. For the anchor Node, the degree of freedom and the magnitude of prescribed constraint force has to be specified by clicking on the Create button. The anchor node will be enforced constrained.

    • Weightage

      This option is supported only for MPC defined between faces. User has to select the dependent and independent faces and then specify the number of independent nodes. For each dependent node, SimLab automatically finds the specified number of independent nodes in the selected independent faces and then writes out Nastran/Abaqus equation cards by assigning weightage for the independent nodes based on the distance from the dependent node.

    • Cyclic MPC

      This option is used to connect node pairs in cyclic symmetric models. The faces should have identical node pattern to connect as cyclic MPC. The faces with identical node pairs can be created using symmetry mesh control. On Nastran export, the Cyclic MPC toggle should be turned ON to export as cyclic MPC, if the toggle is OFF, then it will be exported as MPC.

      Example

      Cyclic MPC

Cards supported for various solvers

Solver Supported Cards
Nastran

MPC

CYSYM, CYJOIN (Cyclic MPC)
OptiStruct MPC
Abaqus *EQUATION
Permas $MPC SAME
ADVENTURECluster $LinearConstraint