Abstract
To investigate the influence of Coriolis force on vibration characteristics of mistuned bladed disk, a bladed disk with 22 blades is employed and the effects of different rotational speeds and excitation engine orders on the maximum forced response are discussed considering the effects of Coriolis forces. The results show that if there are frequency veering regions, the largest split of double natural frequencies of each modal family considering the effects of Coriolis forces appears at frequency veering region. In addition, the amplitude magnification factor considering the Coriolis effects is increased by 1.02% compared to the system without considering the Coriolis effects as the rotating speed is 3000 rpm, while the amplitude magnification factor is increased by 2.76% as the rotating speed is 10000 rpm. The results indicate that the amplitude magnification factor may be moderately enhanced with the increasing of rotating speed. Moreover, the position of the maximum forced response of bladed disk may shift from one blade to another with the increasing of the rotational speed, when the effects of Coriolis forces are considered.
Highlights
When the vibration characteristics of bladed disk are designed and analyzed, the bladed disk is assumed to be tuned [1,2,3,4]
The effects of Coriolis forces of bladed disk are influenced by the geometrical shapes of the blade, so a realistic bladed disk of jet engine is employed in this paper
The largest split of double natural frequencies of every modal family considering the effects of Coriolis forces appears at frequency veering region, since the effects of Coriolis forces are influenced by the mode shapes
Summary
When the vibration characteristics of bladed disk are designed and analyzed, the bladed disk is assumed to be tuned [1,2,3,4]. Huang and Kuang [12] used Galerkin’s method to research the mode localization of bladed disk considering the effects of Coriolis forces. Their results pointed out that rotating speed has a significant effect on the mode localization of mistuned bladed disk. If there are frequency veering regions in curves of natural frequencies versus nodal diameters, the degree of double natural frequencies split of every modal family is not thoroughly discussed in previous work It is important for avoiding resonance of bladed disk.
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