Geometric Misalignment dialog box (Simcenter Nastran)

Use this dialog box to model misalignment of rotors in a Simcenter Nastran rotor dynamic analysis for the SOL 414,111 harmonic response or SOL 414,129 transient response solution types. To create a Geometric Misalignment load, you must first create a CLINK element. If you did not create a CLINK element yet, see Model a misaligned rotor.

Name
Name	Sets the name of the load. The name appears in the Load Container and the Information window.
Description	Sets the description of the load. The description appears in the Information window.You can use Cut , Copy , and Paste commands to copy and paste the description.
Destination Folder
Load Container	Specifies the folder in the Simulation Navigator in which to store the load. The list includes the root container and existing folders that you created using the New Folder command. Examples of a root container include Load Container, Constraint Container, and Simulation Object Container.
Folder Manager	Displays a hierarchical list of existing folders. To create a new folder, right-click any level of the hierarchy and choose New Folder.
Elements
Group Reference	Lets you apply the Geometric Misalignment load to an existing group.For more information, see Group Reference options.
Select Object	Lets you select the CLINK element to which you want to apply the misalignment load.
Stacked Smart Selector Methods	Opens the Smart Selector Methods dialog box where you can specify a progression of smart selection filters.For more information, see Smart Selector Methods dialog box.
Excluded	Lets you remove individual entities from the selection.
Rotor
Rotor	Specifies the rotor region to which you want to apply the misalignment load. The rotor region provides the rotation speed and the coordinate system for the rotor direction.If you are creating misalignment between two rotor regions in the rotor assembly, you need to specify only one of the rotor regions. Because the rotation speed and direction must be the same in both rotor regions, you can select either one. Select an existing rotor region or click Create Region to create a new rotor region.To filter a long list of rotor regions, click More Options to display options for searching and filtering the rotor regions.
Translation
The misalignments are defined in cylindrical coordinates.Set these options individually or in combination to create a variety of misalignments. For a summary of the options required to create different types of misalignments, see Misalignment combinations below.
Amplitude	Sets the distance for a translational (radial) misalignment.
Phase	Sets the angle of the translation misalignment compared to the X-axis.
Axial Offset	Sets the distance for an axial (parallel) misalignment.
Rotation
The misalignments are defined in cylindrical coordinates.Set these options to create a rotational misalignment. To create both a rotational misalignment and a translational misalignment, set these options and a combination of the options in the Translation group. For a summary of the options required to create different types of misalignments, see Misalignment combinations below.
Amplitude	Sets the amplitude of rotational (angular) misalignment in degrees.
Phase	Sets angle of the rotational (angular) misalignment in degrees measured from the X-axis

Misalignment combinations

The following table lists the possible misalignment combinations and the options you need to set to create the misalignment.

To create this misalignment	Set these options
Translational misalignment only	In the Translation group:Amplitude****Phase
Translational misalignment and axial offset	In the Translation group:AmplitudePhaseAxial Offset
Translational misalignment and rotational misalignment	In the Translation group:Amplitude****PhaseIn the Rotation group:Amplitude****Phase
Translational misalignment, rotational misalignment, and axial offset	In the Translation group:AmplitudePhaseAxial OffsetIn the Rotation group:Amplitude****Phase
Rotational misalignment only	In the Rotation group:Amplitude****Phase
Rotational misalignment and axial offset	In the Translation group:Axial OffsetIn the Rotation group:Amplitude****Phase
Axial offset only	In the Translation group:Axial Offset

How do I

Model a misaligned rotor

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Modeling misaligned rotors

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Geometric Misalignment dialog box (Simcenter Nastran), Simcenter 3D 2021.1 Series

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