Comparative study of two order reduction methods for high-dimensional rotor systems

In this research note, two order reduction methods in the high-dimensional rotor systems are presented: one is the transient proper orthogonal decomposition (T-POD) method and the other is the structure order reduction (SOR) method. The accuracy of the SOR method is verified in comparison to the critical speed error, and the efficacy of the T-POD method is verified via comparing with the nonlinear instability behaviours of the original and reduced models. The SOR method is applied to compare with the T-POD method, and further verifies the efficacy of the T-POD method. The numerical results indicate that both the T-POD method and the SOR method can be applied for order reduction in the high-dimensional rotor system.