Creating a harmonic load event

Using the Harmonic Event command, you can create a harmonic load event to perform durability analysis of a model that is exposed to a harmonic excitation, described by a sine wave in a frequency domain.

For durability analysis of a harmonic load event, you must define the harmonic data source, and the scaling factor. The harmonic data source contains the data required for the dynamic analysis of the solution. The harmonic load event then points to the harmonic data sources and contains the durability parameters. You must also create a Local Stress State simulation object that uses linear projections, for example with critical planes. You can also define the load length and assign a temperature source to the load event.

Data source

Using the Harmonic Data Source command, you can create a harmonic data source, that is used to define a harmonic event, by specifying the mode set, the vibration input, and the vibration load type that the solver uses to determine the forcing frequencies. Harmonic data source supports the following load types:

• Sine sweepThe load is applied in the form of a sine wave. The common frequency range of the applied loads must contain the frequency range of the sine sweep.

• Sine dwellThe load is applied in the form of a peak. The common frequency range of the applied loads must contain the frequency range of the sine dwell.

A mode set is a collection of structural modes that are derived from different data sources. The modes are characterized by the natural frequency, modal damping, modal mass, and mode shape vector. You can define the boundary conditions used to compute the modes contained in the mode set.

For a vibration input, you define translational and rotational vibration inputs as free, fixed, enforced motion, nodal force, or nodal moment excitation types, and assign them to the selected nodes in specified directions.

Where do I find it?

Application	Pre/Post
Prerequisites	A Simulation file as the work part and displayed part
Command Finder	Harmonic Event Harmonic Data Source
Simulation Navigator	Right-click the Events node→New Event→Harmonic EventRight-click the Harmonic Data Sources node→Harmonic Data Source
Location in dialog box	Harmonic Event dialog box→Data Source group→Create Data Source

How do I

Create a temperature source load for part of the model

Create a temperature source load for the entire model

Automatically create a duty cycle load event

Create a random data source

Create a vibration input

Create a random load event

Create a harmonic data source

Create a harmonic load event

Learn more

Supported solution types for load events

Creating a temperature source load

Creating a block load event

Creating a superposition event

Creating a transient event

Creating a flexible body event

Creating a duty cycle load event

Automatically creating a duty cycle load event

Creating a random load event

Managing specialist durability load events

Look up more details

Modal basis in vibration load events definition

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Creating a harmonic load event, Simcenter 3D 2021.1 Series

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