Rotor dynamics workflow

Step	Detailed steps
1. Create the FEM and Simulation files for the rotor dynamic analysis.	Create a rotor dynamic solution
2. (Optional) For a SOL 107 Direct Complex Eigenvalue solution, specify complex modal reduction.	Create a rotor dynamic solution
3. Turn off residual vectors.	Create a rotor dynamic solution
4. (Optional) Select mode tracking method.	Create a rotor dynamic solution
5. (Optional) For a SOL 107 Direct Complex Eigenvalue or SOL 110 Modal Complex Eigenvalue solution, specify the ROTSYNC parameter to skip synchronous analysis.	Create a rotor dynamic solution
6. (Optional) For a SOL 107 Direct Complex Eigenvalue or SOL 110 Modal Complex Eigenvalue solution, request .csv or .gpf files.	Create a rotor dynamic solution
7. (Optional) Create a static subcase to account for centrifugal stiffening.	Create a rotor dynamic solution
8. Create the FE model. As a best practice, create a distinct mesh for each rotor.
9. Create coincident nodes at each bearing support location.
10. Create bearing supports. As a best practice, use CBEAR elements to model bearing supports.	Define bearing supports between coincident nodes with CBEAR elements
11. Assign physical properties to the CBEAR elements.	Assign physical properties to CBEAR elements
12. Define each rotor in the model.	Define rotors
13. Map CBEAR elements to the appropriate rotor.	Map CBEAR elements to rotors
14. Define stationary nodes for CBEAR elements.	Define stationary nodes for CBEAR elements
15. Define system-wide rotor dynamic solution options.	Define system-wide rotor dynamics solution options
16. Define rotor-specific rotor dynamic solution options.	Define rotor-specific rotor dynamics solution options
17. Define the boundary conditions for the model.
18. (Optional) For a SOL 107 Direct Complex Eigenvalues or SOL 110 Modal Complex Eigenvalues solution, define the mode filtering criterion.	Specify mode filtering
19. (Optional) To account for centrifugal stiffening in a rotor, create a centrifugal load that has an angular velocity of 1 radian/sec. Include the centrifugal load in the static subcase.	Model centrifugal stiffening and softening in rotor dynamic analysis
20. (Optional) For a SOL 108 Direct Frequency Response or SOL 111 Modal Frequency Response solution, define the shaking force that results from the mass imbalance of a rotor as the excitation.	Model mass imbalance in rotor dynamic analysis
21. Solve the rotor dynamics model.
22. (Optional) Post-process the rotor dynamic analysis results. Create a Campbell diagram from complex eigenvalue rotor dynamic analysis results.	Create a Campbell diagram

How do I

Create a rotor dynamic solution

Define bearing supports between coincident nodes with CBEAR elements

Assign physical properties to CBEAR elements

Define rotors

Define the superelement reduction for a rotor

Map CBEAR elements to rotors

Define stationary nodes for CBEAR elements

Define system-wide rotor dynamics solution options

Define rotor-specific rotor dynamics solution options

Specify mode filtering

Model centrifugal stiffening and softening in rotor dynamic analysis

Model mass imbalance in rotor dynamic analysis

Create a Campbell diagram

Learn more

Rotor dynamics

Supported solution types for rotor dynamic analysis

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Rotor dynamics workflow, Simcenter 3D 2021.1 Series

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