Function requirements by excitation type

You can use various excitation functions for Response Dynamics, depending on the type of event you use.

For this Analysis type...	This excitation type...	Requires these components
TransientNote: Time functions must be evenly spaced.	Nodal force	Node, direction, and a force function.
Nodal enforced motion	Solved enforced motion location, node, direction, and a displacement, velocity, or acceleration function.
Distributed load	Dynamic load (in a Dynamics Subcase) and a scaling function (unitless scalar time function). The distributed load excitation is defined as:where E(t) = time domain distributed excitation F(t) = scaling function L = load distribution (distributed attachment mode)
Velocity impact	Solved enforced motion location defined on a single node only. Also, no other excitations can be defined in the event. Any Initial Conditions are ignored (set to 0).
Quasi-Static	Static load	Dynamic load defined in a Dynamics Subcase.Scaling function (unitless scalar time function). The static load excitation is defined as:where E(t) = time domain static excitation F(t) = scaling function L = distributed attachment mode
Frequency	Nodal force	Node, direction, and a force function.
Nodal enforced motion	Solved enforced motion location, node, direction, and a displacement, velocity, or acceleration function.
Distributed load	Dynamic load and a scaling function (unitless scalar spectrum function).The distributed load excitation is defined as:whereE(f) = frequency domain distributed excitation F(f) = scaling functionL = load distribution (distributed attachment mode)
Rotating force	Node, axis, initial phase angle, and a force function.
Random	Nodal force	Node, direction, and a force PSD function.
Nodal enforced motion	Solved enforced motion location, node, direction, and a displacement, velocity, or acceleration PSD function.
Distributed load	Dynamic load and a scaling function (unitless scalar PSD function). The distributed load excitation is defined as:where EPSD(f) = frequency domain distributed excitation FPSD(f) = scaling functionL = load distribution (distributed attachment mode)
Response Spectrum	Nodal enforced motion	Solved enforced motion location, node, direction, and a displacement, velocity, or acceleration response spectrum function.

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 parameters by event type

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

Browse Simcenter 3D help by product area

Function requirements by excitation type, Simcenter 3D 2021.1 Series

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