19th Asia-Pacific Vibration Conference (APVC2021)

278 / 2021-04-15 23:03:20

Mobile Interface CMS Method for Vibration Characteristics Prediction of Mistuned Bladed Disk with Different Coupling Degrees

vibration characteristics；mobile interface CMS method；fixed interface CMS method；direct method；mistuned bladed disk；coupling degree

Special Sessions > Dynamic modelling, simulation and application of rotor systems

The prediction of vibration characteristics was studied in mistuned bladed disk by mobile interface prestressed component mode synthesis (CMS) super-element method. When the strongly, generally and weakly coupling in mistuned bladed disk，according to the results of direct method, the prediction accuracy of this method was verified and compared with the fixed interface CMS method by using the relative error of dynamic frequency, vibration mode matching function and dimensionless root mean square error of vibration amplitudes. It is pointed that for mistuned bladed disk in strongly coupling, the prediction accuracy of dynamic frequency and vibration amplitudes are higher by the mobile interface CMS method and the vibration modes are matched with the direct method. In weakly coupling, the results of dynamic frequency and vibration modes predicted by the mobile interface CMS method and the fixed interface CMS method are consistent with the direct method, but the vibration amplitudes prediction error of the mobile interface CMS method are lower than the fixed interface CMS method. In generally coupling, the mobile interface CMS method has higher dynamic frequency prediction accuracy at low-order, and the two methods have comparable dynamic frequency prediction accuracy at high-order. The vibration modes predicted by the two methods are matched with the direct method, and the vibration amplitudes prediction accuracy of the mobile interface CMS method are higher than that of the fixed interface CMS method. The results indicate that the mobile interface CMS method could more accurately predict vibration characteristics of mistuned bladed disk with different coupling degrees and could be an effective measurement for studying vibration characteristics of mistuned bladed disk system.