OS-E: 6000 Linear Static Analysis

This example demonstrates Rotor Dynamics Linear Static Analysis using two coaxial rotors.



Figure 1. FE Model

Model Files

Refer to Access the Model Files to download the required model file(s).

The model files used in this example include:
  • RD_Lstat.fem
  • RD_Lstat_NOGYRO.fem

Model Description

This example consists of two coaxial rotors modeled using 1D elements. One end of each rotor is constrained, the same end is attached to stator using rigid elements and on the other end is attached to the stator through spring and damper elements. Static loading condition due to centrifugal force is applied to the rotors also relative spin between the two rotors are defined. Synchronous and Asynchronous analysis are performed at different maximum rotor speeds.
FE Model 1D Elements
Rotor
CBAR, CONM2
Stator
SPC, CDAMP, CELAS
Junction
RBE2 Elements
Material Material MAT1 Rotor:
Young’s modulus
2×107
Poisson ratio
0.3
Initial density
1×10-3
Reference Guide Entries Keywords RGYRO, ROTORG, RSPINR, DDVAL, RFORCE

Results



Figure 2. Maximum Displacement on the Rotor for Subcase 1 with/without RGYRO


Figure 3. Maximum Displacement on the Rotor for the Two Subcases with RGYRO