Quasi-Modal technique is used for rotor-blade coupled torsional vibration analysis, because of its unique characteristics to provide a visual reduced model. In this paper we propose the hybrid method to calculate rotor-blade coupled torsional vibration of the model rotor of two disks with continuously coupled blades using FEM based quasi-modal parameters of blade-disk system. The result of hybrid method is compared with the full FEM analysis of the model rotor. The hybrid method shows the good accord with the full FEM analysis. This hybrid method has the advantage for faster design calculation repetition. The rotation test of model rotor is executed and measured results are compared with the calculated results to show the good accordance. The calibration procedure of modal parameters based on the measured blade-disk frequencies is also presented in order to show that the quasi-modal modeling is practicable method to feed back test results to analytical model for better accuracy.
