Nastran environment > Nastran rotor dynamic analysis (SOL 414)
Define the rotor dynamics solution parameters
Choose Rotor Dynamics tab→Rotor Modeling→Modeling Objects .
In the Modeling Objects Manager dialog box, from the Type list, select Rotor Dynamics Solution Parameters and click Create.
In the Rotor Dynamics Solution Parameters dialog box, in the Starting Speed (RSTART) box, type a value for the starting speed.
In the Step Size (RSTEP) box, type a value for the step size.
In the Number of Steps (NUMSTEP) box, type a value for the number of steps.
From the Reference System (REFSYS) list, select the type of reference system for the analysis.If the stator is not axisymmetric and the rotor is axisymmetric, select FIX.If the rotor is not axisymmetric and the stator is axisymmetric, select ROT. In this case, the rotor can be axisymmetric, 1D, 3D, or 3D cyclic symmetry, but the bearings must be isotropic.Each reference frame type has some additional options that you must consider. For more information, see Symmetry and reference frames, Fixed reference frames, and Rotating reference frames in Rotor dynamic analysis (SOL 414).
(Optional) In the Properties group, specify the other parameters.
Click OK.
In the Modeling Objects Manager dialog box, click Close.
How do I
Create connection elements between coincident nodes with CBEAR2 elements
Define rotor bearing or bushing properties
Create a rotor region
Define a rotor
Create an unbalance mass
Define forcing frequencies
Define nonlinear transient parameters
Set the duration of the simulation
Create a modeling object
Assign a modeling object to a solution or solution subcase
Learn more
Rotor dynamic analysis (SOL 414)
Modeling axisymmetry (SOL 414)
Modeling cyclic symmetry (SOL 414)
Creating connection elements on a rotor model (SOL 414)
Damping (SOL 414)
Quick links
Command reference
Pre/Post video examples
Bulk Entry Descriptions
Simcenter 3D tutorials
Browse Simcenter 3D help by product area
Define the rotor dynamics solution parameters, 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 } });
Source: https://docs.sw.siemens.com/en-US/doc/289054037/PL20200601120302950.advanced/xid1787277 · retrieved 2026-07-17