Create rotating force excitations

You can create a rotating force excitation for frequency events when Mode Displacement is the data recovery method.

1. In the Simulation Navigator, right-click the Excitations node (under the current Event node) and choose New Excitation→Translational Nodal.

2. In the New Nodal Function Excitation dialog box, type a name for the excitation in the Name box.

3. Under Type, choose Nodal Force.

4. Select the node where you want to define the rotating force. The node must have three free DOF.

5. Under Excitation Functions, select User-Defined Rotation.

6. Under Rotation Axis, select the axis about which the force should rotate. This axis is used to define the rotating plane and is defined by the nodal displacement coordinate system. Depending on the DOF available at the node, the software will determine the possible rotating planes for you to choose.

7. Click the button that appears next to the Function box and choose Function Manager.

8. In the XY Function Manager dialog box, select an existing Spectrum Force function from the list. Only functions in an open AFU file appear (open the AFU file on the XY Function Navigator). You can also click New to create a new Spectrum Force function.Note: For information about creating and managing functions, see the Functions and Graphing help.

9. In the Phase Angle box, type the starting phase angle to define the phase difference between the two component excitations. When you create a rotating force excitation, the software actually creates two excitations rotating in opposite directions about the rotation axis. For more information about how the software uses the phase angle, see Rotating forces and unbalanced masses.

10. Under Scale Factor, type a scale value. The function typically represents the baseline value that you use for several different situations. The Scale Factor allows you to tailor the function's output for the specific situation.

11. Click OK.

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Create rotating force excitations, Simcenter 3D 2021.1 Series

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