Vibration of Bi-Periodic Bladed Disk

The dynamic behavior of bi-periodic bladed disk has been studied systematically. Bi-periodicity in bladed disk means that two types of structural subassemblies, alternating in circumferential direction, make up the structure. Based on a lumped parameter model, the dynamic behaviors of mono- and bi-periodic structures were compared. The nodal diameter spectrum was proposed to compare the difference of modes between mono- and bi-periodic bladed disk. The modified modal assurance criterion was proposed to evaluate the vibration suppression ability of bi-periodic bladed disk. The results showed that the generalized force and infinity norm are two most effective factors in altering modal dynamics. At the end, an improved Monte Carlo simulation is performed to show the resonance attenuation ability of bi-periodic bladed disk with mistuning considered.