Vibration characteristics of an elastic blade-disk-shaft coupling system

被引：0
|
作者：
Li C.-F. [1 ]
Liu W. [1 ]
She H.-X. [1 ]
Wen B.-C. [1 ]
机构：
[1] Mechanical Engineering and Automation Institute, Northeastern University, Shenyang
来源：
Zhendong Gongcheng Xuebao/Journal of Vibration Engineering | 2016年 / 29卷 / 05期
关键词：
Blades' number; Disk's position; Natural frequencies; Numerical results; Rotor-blades coupling system;
D O I：
10.16385/j.cnki.issn.1004-4523.2016.05.017
中图分类号：
O172 [微积分];
学科分类号：
摘要：
The continuous physical equations in rotation of the shaft-disk and the blades are deduced, discretized and group-setting processed, respectively. Then, the motion differential equation of a flexible rotor-blade coupling system is established. The gyroscopic effect is also taken into consideration in the derivation work to guarantee the accuracy of the calculation at the same time. The influences of the number of blades and the position of the disk on the natural frequencies of the system are analyzed on the basis. It is found that there are two coupling modes: shaft-blade (SB) and blade-blade (BB) due to the coupling between blade and shaft through comparative analysis. The inter-blade (BB) modes are of repeated frequencies of (Nb-2) multiplicity for number blades, and the shaft-blade (SB) modes are of repeated frequencies of (2) multiplicity for number blades. With the increase of the number of blades, the natural frequencies of the rotor decreases linearly, that of BB mode is constant, and that of SB mode increases linearly. The first two order natural frequencies of the rotor and SB mode are both affected by the position of the disk and are symmetric around the center of the shaft. The first order natural frequency of SB mode increases gradually during the motion of disk from the end of the shaft to the middle and reaches the maximum in the middle. The second order natural frequency of SB mode first increases and then decreases during the motion of disk from the end of the shaft to the middle and reaches the minimum in the middle. And the changing trend of both kinds of frequencies will be more obvious when the number of blades increases. The change of the natural frequencies of rotor is opposite to than of the SB mode, but the changing trend of frequencies is not affected by the number of blades. The research achievements of the paper have certain guiding significance for the further research of inherent characteristics of the blade-rotor system. © 2016, Nanjing Univ. of Aeronautics an Astronautics. All right reserved.
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页码：894 / 899
页数：5
相关论文
共 14 条
  • [1] Omprakash V., Ramamurti V., Coupled free vibration characteristics of rotating tuned bladed disk systems, Journal of Sound and Vibration, 140, 3, pp. 413-435, (1990)
  • [2] Huang S.C., Ho K.B., Coupled shaft-torsion and blade-bending vibrations of a rotating shaft-disk-blade unit, Journal of Engineering for Gas Turbines and Power, 118, 1, pp. 100-106, (1996)
  • [3] Guo L., Zhu J., The coupled torsional vibrations research of rotor-blade disk-vane system in steam turbine, Turbine Technology, (2001)
  • [4] Yang C.H., Huang S.C., The coupled vibration in a shaft-disk-blades system, Journal of the Chinese Institute of Engineers, 28, 1, pp. 89-99, (2005)
  • [5] Turhan O., Bulut G., Linearly coupled shaft-torsional and blade-bending vibrations in multi-stage rotor-blade systems, Journal of Sound and Vibration, 296, 1, pp. 292-318, (2006)
  • [6] Yang C.H., Huang S.C., The influence of disk's flexibility on coupling vibration of shaft-disk-blades systems, Journal of Sound and Vibration, 301, 1, pp. 1-17, (2007)
  • [7] Wang L.G., Cao D.Q., Chao H.U., Et al., Effect of the blade vibration on the dynamical behaviors of a rotor-bearing system, Journal of Harbin Engineering University, 28, 3, pp. 320-325, (2007)
  • [8] Wang L., Cao D.Q., Huang W., Nonlinear coupled dynamics of flexible blade-rotor-bearing systems, Tribology International, 43, 4, pp. 759-778, (2010)
  • [9] Chiu Y.J., Huang S.C., The influence on coupling vibration of a rotor system due to a mistuned blade length, International Journal of Mechanical Sciences, 49, 4, pp. 522-532, (2007)
  • [10] Chiu Y.J., Chen D.Z., The coupled vibration in a rotating multi-disk rotor system, International Journal of Mechanical Sciences, 53, 1, pp. 1-10, (2011)
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