New Translational Nodal Function Excitation / New Rotational Nodal Function Excitation dialog box

This topic applies to both the translational and rotational excitation dialog boxes.

Name
Name	A descriptive name for the excitation.
Description	A longer description for the excitation.
Excitation Location
Excitation	The type of excitation to apply.Nodal Force — Lets you apply a force load to a node, for use in Transient, Frequency, and Random events. With Mode Acceleration events, you can apply the excitation only to the Nodal Force Location you defined for the solution (the DOFs where attachment modes have been calculated). With Mode Displacement events, you can apply the excitation to any DOF.Enforced Motion — Lets you apply nodal displacement, acceleration, or velocity functions for use in transient, frequency, random, and response spectrum events. These functions can be applied only at the Enforced Motion Location you defined for the solution (the DOFs where constraint modes have been calculated). All enforced motion functions must be displacement, velocity, or acceleration functions. If you do not apply functions to the defined enforced motion locations, the software will assume they are fixed (zero displacement at every time point). For a random base excitation event, this is the only type available.
Selection Method	Available only for Enforced Motion excitations.Choose a method for selecting a location on the model as the excitation location.Graphic Selection — Lets you select the desired excitation location in the graphics window.List Selection — Lets you select the node ID and direction from a list of available locations. For a random base excitation event, this is the only method available and the ID of the enforced motion node is displayed.
Select Object	Available when Selection Method is set to Graphic Selection.Lets you select a nodal location for the excitation. When using the Mode Displacement data recovery method, you can select any DOF (node and direction) in which to apply the excitation.
Label	Available when Excitation is set to Nodal Force.Lets you select a nodal location for the excitation by node label.Press enter or click Select to enter your selection.To edit your selection, click Edit Contents .
Excitation Location List	Available only for Enforced Motion excitations, and for Nodal Force excitations for Mode Acceleration events when the Selection Method is set to List Selection.Opens the Select Excitation Location dialog box, where you can select a single DOF (node ID plus direction) from your previously defined excitation location.
Excitation Functions
User Defined Direction	Available only for translational Nodal Force excitations for Mode Displacement events.Lets you define a user-defined direction for the excitation and specify the excitation function. When not selected, lets you define the excitation component according to the direction already defined in the excitation location or by selecting one or more directions with the X, Y, and Z check boxes.
User Defined Rotation	Available only for rotational excitations for Frequency events using Mode Displacement.Creates a pair of rotating force excitations. Specify the phase angle and rotation axis (a plane of rotation), and specify the loading function. The software creates the required excitations to be included in the event and displays them in the Response Dynamics Details View subpanel in the Simulation Navigator. Note: To use this capability, the X, Y, and Z directions for the node must be free. For more information about rotating force excitations, see Create rotating force excitations.
Rotation Axis	Available only when User Defined Rotation is selected.Choose the axis about which the force is rotating. This axis is used to define the rotating plane and is defined by the nodal displacement coordinate system.
Phase Angle	Available only when User Defined Rotation is selected.The starting phase angle used to define the phase difference between two rotating faces.
X, Y, Z	Available only when you are defining translational excitations, when User Defined Direction is not selected.Lets you assign an excitation function to one or more translational directions (X, Y, and Z).If you are defining an enforced motion excitation, or if you are using the Mode Acceleration data recovery method, these check boxes are not active until you select an excitation location (using the button). After you select an excitation location, the direction check box that corresponds to the direction of the excitation location becomes active. For example, if you select an excitation location that was defined in the Y direction, the Y check box becomes active. You can then assign a function to that direction using the button.For a random base excitation event, you can only select a single power spectral density (PSD) function (even or uneven) with an acceleration ordinate measure. The function purpose can be general or response dynamics.
RX, RY, RZ	Available only when you are defining rotational excitations, when User Defined Direction is not selected.Lets you assign an excitation function to one or more rotational directions (RX, RY, and RZ) in which to apply the excitation.
Function	The record name of the scaling function assigned to this excitation.
	Lets you choose an action from a list: Function Manager — Opens the XY Function Manager dialog box, where you can browse the list of excitation functions you have defined (for all open AFU files) or create a new function. Select the excitation function to apply for this direction.Plot — Plots the selected function. After selecting a function from the Function Manager, you can plot the function.Information — Displays information about the selected function.
Specify Vector	Available only when User Defined Direction is selected.The method for specifying the (vector) direction for the software to use to determine the proper scaling factor in each component direction. For information about the Vector dialog box, see Vector dialog box.
Reverse Direction	Available only when User Defined Direction is selected.Reverses the current direction of the excitation.
Scale Factor	Applies a scale factor to increase or reduce the excitation. For example, you can reduce your excitation level by 50 percent by setting the scaling factor to 0.5. The software multiplies the excitation values contained in the scaling function by this scaling factor to arrive at the actual excitation.
Scale Factors
X, Y, Z	Available only when the corresponding excitation function direction check box is selected.Lets you apply a scaling factor to increase or reduce the excitation.
Phase Angles
Available only for Frequency events.
X, Y, Z	Defines the phase difference between excitations, in degrees.
Frequency Range
Available only for random base excitation events.
Inherit from Function	Inherits the lower and upper bound frequencies from the selected excitation function.
**Lower Bound (Hz)**Upper Bound (Hz)	Available when Inherit from Function is cleared.Set the lower and upper bound frequencies used for solving the random base excitation event. Ideally, these are within the limits of the selected excitation function.

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New Translational Nodal Function Excitation / New Rotational Nodal Function Excitation dialog box, Simcenter 3D 2021.1 Series

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