Abstract: Because the coupling vibration of bladed disk is rather harmful to the structural strength of aeromotors, a lot of work has been done for more than 30 years. Many simplified models of mistimed bladed disk were used for theoretical researches because experimental researches on aeromolors are difficult. However, some of the conclusions of many studies are inconsistent or conflicting. This paper developed a better mechanical model of mistuned bladed disk by Modal Synthesis Method for studying the vibration characteristics of real bladed disk assemblies. The model and theoretical analysis are checked by experiment of forced vibration on a real mistuned bladed disk. In terms of this model, the vibrational natures of the bladed disk assemblies can be studied well.

Key words: mistuned bladed disk, coupling vibration, mechanical model, theoretical analysis method, experiment of forced vibration