Function parameters by event type

When you create excitation functions for Response Dynamics using the Functions and Graphing utilities, you must define certain parameters correctly in the XY Function Editor dialog box. The table below lists these parameters for each excitation type. For each of these types, the Purpose list in the XY Function Editor dialog box must be set to Response Dynamics.

Note:

You can use only Table functions (stored in AFU files) for excitations in Response Dynamics. To use an equation in your function, you must create a Math function and export it to an AFU file. For more information, see Export Math functions to AFU format in the Functions and Graphing help.

Event type	Function Type	XY Axis Definition — Abscissa Data Type	XY Axis Definition — Abscissa Spacing	XY Axis Definition — Ordinate Data Format	XY Axis Definition — Ordinate Data Type
Transient	Time	Time	Even	Real	Nodal force functions — Force
Nodal acceleration functions — Acceleration
Nodal velocity functions — Velocity
Nodal displacement functions — Displacement
Distributed-load scaling functions — Unitless Scalar
Quasi-Static	Time	Time	Even or Uneven	Real	Unitless Scalar
Frequency	Spectrum	Frequency	Even or Uneven	Real or Complex	Same as for Transient functions
Random	Power Spectral Density (PSD)	Frequency	Even or Uneven	Real	Same as for Transient function
Response Spectrum	Shock Response Spectrum	Frequency	Even or Uneven	Real	Nodal acceleration functions — Acceleration
Nodal velocity functions — Velocity
Nodal displacement functions — Displacement

Note:

For Evenly spaced functions, the response is calculated at input frequencies only.

For Unevenly spaced functions, the response is calculated at the input frequencies, the natural frequencies, and at additional spectral lines in between.

Using multiple excitations in an event

If you use multiple excitations in an event, the functions must have the same X Minimum (starting point) and X Increment values (these values determine the number of points in the function). The first excitation function you define determines the number of points requirement for the subsequent excitations you define in the event. To synchronize multiple functions for use in an event, use the Synchronize command.

To preview all excitations defined in an event, use the Response Dynamics Details View subpanel in the Simulation Navigator. Select each excitation (hold Ctrl and select multiple excitations) and then right-click and choose Plot.

How do I

Convert SRS/PSD/Time functions

Import test data into Response Dynamics

Create nodal and enforced motion excitations

Create distributed load excitations

Create static excitations

Create a drop impact or constant velocity impact simulation

Calculate random RMS functions from PSD input

Using Fast RMS Fitted PSD functions

Create rotating force excitations

Correlate two PSD excitations

Create DDAM excitations

Learn more

Excitation loads

Response Dynamics Function Toolkit

Using pulse functions for shock analysis

Velocity Impact excitations

Rotating forces and unbalanced masses

PSD correlation

Look up more details

Function requirements by excitation type

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Function parameters by event type, Simcenter 3D 2021.1 Series

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