Specifying linear perturbation options

In ANSYS, you can use the linear perturbation method to capture the results of a nonlinear static analysis and use them as the initial conditions in modal or buckling eigenvalue analyses. You can use the new Linear Perturbation Options (PERTURB) modeling object to specify options to control the linear perturbation method. For example, you can use options in the Linear Perturbation Options (PERTURB) dialog box to control:

• The type of linear perturbation analysis to perform, such as modal or buckling.

• The material behavior of all structural elements in the model (not including the contact elements).

• The contact status of all contact elements.

• How the software calculates the {Fperturbed} load vector.

The options in the Linear Perturbation Options (PERTURB) dialog box correspond to the options for the ANSYS PERTURB command. For more information on linear perturbation analysis in ANSYS, see Linear Perturbation Analysis in the ANSYS Mechanical APDL and Mechanical Applications Theory Reference.

Including the PERTURB parameters in the solution

After you create a Linear Perturbation Options (PERTURB) modeling object, you must include the modeling object in your solution. On the Restart page in the Solution dialog box, use the Linear Perturbation Options (PERTURB) to specify the modeling object to include.

Where do I find it?

Application	Pre/Post
Prerequisite	A Simulation file with ANSYS as the work part and displayed partANSYS as the specified solverModal as the specified analysis type
Command Finder	Modeling Objects

How do I

Set up a large deflection, prestressed modal cyclic symmetry analysis

Learn more

ANSYS prestressed modal analyses with linear perturbation

Controlling how ANSYS writes restart files

Modifying the behavior of contact pairs

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

Browse Simcenter 3D help by product area

Specifying linear perturbation options, Simcenter 3D 2021.1 Series

© 2020 Siemens

window.mainLanguage="en_US"

window.delivId=""

window.projectId=""

MathJax.Hub.Config({ TeX: { extensions: ["autoload-all.js"] }, tex2jax: { displayMath: [ ] }, "SVG": { scale: 125 } });