Model a misaligned rotor

Use this procedure to model a misaligned rotor in a Simcenter Nastran rotor dynamic analysis for the SOL 414,111 harmonic response or SOL 414,129 transient response solution types.

Before you begin, create your rotor and rotor assembly as explained in Create a rotor region and Define a rotor.

This procedure starts with creating the CLINK element, which is the required 1D connection for applying the Geometric Misalignment load.

1. Make the FEM file the displayed part and the work part.

2. Choose Home tab→Connections group→1D Connection .

3. In the 1D Connection dialog box, from the Type list, select Node to Node.

4. In the graphics window or by using node labels, select the Source and Target nodes that the CLINK element will connect.The nodes must be coincident.

5. In the Connection Element group, from the Type list, select CLINK.

6. Click Edit Mesh Associated Data .

7. In the Mesh Associated Data dialog box, from the Link Option list, select the type of misalignment you want to apply to the connection.To apply both parallel and angular misalignment, or angular misalignment only, select Misalignment in Translation and Rotation.To apply only parallel misalignment, select Misalignment in Translation. This option reduces the degrees of freedom. For example, If you are interested in axial offset only, selecting this option saves computation time because fewer degrees of freedom are considered.

8. Click OK.In the Simulation Navigator, the 1D Collectors node is updated with the Link Collector mesh collector and the CLINK connection_mesh.

9. In the Simulation Navigator, in the Simulation File View panel, right-click the Simulation file and choose Make Displayed Part.

10. Choose Rotor Dynamics tab→Loads and Conditions group→Loads Type list→Geometric Misalignment .

11. In the Geometric Misalignment dialog box, in the Elements group, select the CLINK connection element from the Simulation Navigator.

12. In the Rotor group, from the Rotor list, select the rotor region that the CLINK element connects.If you are modeling misalignment between two rotors, you can select either rotor. The Geometric Misalignment load needs only the rotor speed and direction.

13. Depending on how you set the misalignment type for the CLINK element, set the Translation and Rotation options.For example, if you set the misalignment type for the CLINK element to Misalignment in Translation and you are interested in axial offset only, in the Translation group, enter a value in the Axial Offset box.If you set the misalignment type for the CLINK element to Misalignment in Translation and Rotation and you are interested in translational misalignment, rotational misalignment, and axial offset, you would add values for the following:In the Translation group, Amplitude, Phase, and Axial Offset boxesIn the Rotation group, Amplitude and Phase boxesFor a summary of the options required to create different types of misalignments, see Misalignment combinations in Geometric Misalignment dialog box (Simcenter Nastran).

14. Click OK.The Geometric Misalignment load is added to the Load Container in the Simulation Navigator, and the Geometric Misalignment load symbol is added to the model in the graphics window.

Model a misaligned rotor, Simcenter 3D 2021.1 Series

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