FE Model Component Representation dialog box

Representation
Representation	Specifies the type of alternate representation to use to represent the component FEM in the assembly FEM.Base FEMComponent using the full FEM model.Nastran Standard Super ElementRepresents the component that uses the superelement file created by an external superelement analysis.Nastran Rotor Super ElementRepresents the component that uses the superelement file (.sdb) created by a SOL 414,103 Eigenvalues and Superelement Reduction analysis.Mode SetRepresents the component as a collection of modal model results. For more information, see Mode sets.FRF SetRepresents the component as a collection of frequency response results.ATV SetRepresents the component as a collection of acoustic transfer vector results.VATV SetRepresents the component as a collection of vibro-acoustic transfer vector results.
Nastran Rotor Super Element Name	Appears when Representation is set to Nastran Rotor Super Element.Sets the name of the rotor superelement. This name identifies the superelement when you use the Superelement Recovery command.
Damping
Appears when Representation is set to Nastran Rotor Super Element.
Damping Type	Specifies the type of damping to apply to the rotor superelement. Applying damping dissipates energy on the rotor superelement and adds a damping matrix to the reduced mass and stiffness matrices. The damping options are useful when damping was not applied to the original rotor. No DampingNo damping is applied.ViscousApplies viscous damping, which dissipates the energy in proportion to speed.Hysteretic Stiffness FactorApplies hysteretic stiffness damping, which dissipates the energy in proportion to stiffness and displacement.
Viscous Stiffness Factor (ALPHA2)	Appears when Damping Type is set to Viscous.Sets the viscous stiffness factor for the rotor superelement.For more information, see the remarks for ALPHA2 in SEDAMP.
Viscous Mass Factor (ALPHA1)	Appears when Damping Type is set to Viscous.Sets the viscous mass factor for the rotor superelement.For more information, see the remarks for ALPHA1 in SEDAMP.
Hysteretic Stiffness Factor (GE)	Appears when Damping Type is set to Hysteretic Stiffness Factor.Sets the complex stiffness factor for the rotor superelement.For more information, see the remarks for GE in SEDAMP.
Matrices Scaling Factors
Appears when Representation is set to Nastran Rotor Super Element.
Stiffness Matrix Scaling Factor	Sets the scaling factor for each matrix. Use the scaling factors to adjust, isolate, or eliminate the effect of a particular matrix on the rotor superelement in the assembly model. By default, the scaling factor for each matrix is 1. To eliminate a matrix, set the scaling factor to 0. To increase the effect of a matrix, set the factor to a number greater than 1.For example, if you are interested in the influence of the gyroscopic effect, you can run two simulations:Run the first simulation with all matrices enabled, which is the default.Run the second simulation with the gyroscopic matrix disabled (Gyroscopic Matrix Scaling Factor set to 0).You can then compare the Campbell diagrams of the two simulations and look for the differences that occur from eliminating the gyroscopic effect.
Mass Matrix Scaling Factor
Gyroscopic Matrix Scaling Factor
Damping Matrix Scaling Factor
Circulatory Forces Matrix Scaling Factor
Superelement File
Available when Representation is set to Nastran Standard Super Element or Nastran Rotor Super Element.
Source	Appears when running Teamcenter Integration. Applies to Nastran Standard Super Element.LocalEnables you to browse your local operating system for external superelement .op2 files.TeamcenterEnables you to browse the Teamcenter database for external superelement datasets.
File name	Lets you specify the full path and file name of the file that contains the superelement.Enter the path and file name or click Browse to navigate to and select the file.For a Nastran Standard Super Element, open an .op2 file. For a Nastran Rotor Super Element, open an .sdb file (the corresponding .u18 file must be in the same location).
Reload	If the superelement file is modified, select this check box to propagate the changes to your system model.
Units
Appears when Representation is set to Nastran Standard Super Element or Nastran Rotor Super Element.
Length****Mass	If the imported superelement file has no units of length or mass, you can define them here.Note: For a Nastran Rotor Super Element, if the model in which you plan to use the rotor superelement is in a different unit system than the unit system in which the superelement was created, you can select the unit system of the original model when you add the superelement to the assembly FEM file. You cannot change the units after you add the rotor superelement to the assembly FEM file.
Mode Set
Available when Representation is set to Mode Set.
Mode Set	Lets you select an existing mode set from the list, or click Create Fem Data Set to create a new set. A mode set is a reduced form of the dynamic characteristics of a structure with a smaller number of degrees of freedom.For more information, see Mode sets.
Frequency Response Set
Available when Representation is set to FRF Set.
Mode Set	Lets you select an existing frequency response function (FRF) set from the list, or click Create Fem Data Set to create a new set.For more information, see FRF sets.
Export Options
Available when Representation is set to Mode Set.
Binary Format	Controls whether the software writes out the Mode Set in ASCII or binary format.Note: Because the software can process binary data faster than ASCII data, solves that include a binary mode set are typically faster.
Constraint Equations Formatting (MPC)	Available when the Binary Format check box is cleared.Controls the nodes that the software includes in the mode set when you export or solve the solution. For each node in the mode set, the software writes out six multipoint constraint equations (MPC bulk data entries for Nastran models) to the solver input file, one for each dependent degree of freedom.All NodesSelects all nodes for the mode set.Connection NodesSelects the connection nodes only for the mode set. Connection nodes are connected to elements that are not part of the mode set.Select Node GroupSelects all nodes in the specified group for the mode set. The software skips any nodes that are in the selected group but are not part of the mode set.
Node Group	Available when Constraint Equations Formatting (MPC) is set to Select Node Group.Lets you select that group that contains the nodes to use to create the mode set.
Graphical Representation
Display	Controls how the software displays the alternate representation of the component in the overall model.NoneThe software does not display any graphical representation of the alternate representation.Approximation of base FEMDisplays a transparent, non-selectable approximation of the original component FEM. Note: Does not apply to Nastran Rotor Super Element.Superelement SymbolDisplays a generic, symbolic representation of the representation as a spider element.For more information, see Displaying alternate FEM representations.
Color	Sets the color of the alternate representation display.
Style	Sets the line style type of the alternate representation display.
Width	Sets the line width of the alternate representation display.
Regenerate FEM approximation	If you change the set, regenerates the base FEM approximation to incorporate those changes.

How do I

Replace Base FEM components with superelements

Replace a FEM file with a mode set or FRF set

Replace different FEM files with an ATV set or VATV set

Learn more

Using superelements in an assembly FEM

Replacing a component FEM with a superelement

Superelement displays

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FE Model Component Representation dialog box, Simcenter 3D 2021.1 Series

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