Vibration Response Localization of Bladed Disk with Pre-Twist Mistuning

A new mistuning form, pre-twist mistuning was found in the bladed disk based on the engineering practice. Based on a continuous parameter model of bladed disk, the characteristics of bladed disk with pre-twist mistuning and natural parameters mistuning, including stiffness mistuning, mass mistuning and damping mistuning were compared and analyzed, and the effect of pre-twist mistuning on the vibration response localization of bladed disk was researched. The result shows that pre-twist mistuning can lead vibration response localization to bladed disk as well as natural parameters mistuning. The degree of vibration response localization caused by force mistuning is comparative with the natural parameters mistuning. Compared with natural parameters mistuning, the pre-twist mistuning could not change the natural characteristics of bladed disk. As a result, the pre-twist mistuning can not be detected by traditional method, such as the frequency test. The result not only completed the research content of bladed disk, but also conducted the design and manufacture of bladed disk.