Nonlinear Dynamic Characteristics of a Rod-Fastened Rotor System

被引：3
|
作者：
Da Q. [1 ,2 ]
Yuan Q. [1 ,2 ]
Li P. [1 ,2 ]
机构：
[1] School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an
[2] Shaanxi Engineering Laboratory of Turbomachinery and Power Equipment, Xi'an Jiaotong University, Xi'an
来源：
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | 2019年 / 53卷 / 05期
关键词：
Broyden algorithm; Harmonic balance method; Nonlinear flexural stiffness; Rod-fastened rotor;
D O I：
10.7652/xjtuxb201905007
中图分类号：
学科分类号：
摘要：
The nonlinear bending stiffness of a rod-fastened rotor varies with the applied loads to significantly influence the dynamic characteristics. In this paper, cubic and bi-linear models are both adopted to perform a comparative analysis on the nonlinear dynamic characteristics of a rod-fastened rotor system. First, the bending stiffness of the rod-fastened rotor system with two disks is obtained using a 3D FEM model. Then, a cubic stiffness model is applied to approximate the nonlinear stiffness, and subsequently the corresponding governing equation is derived. The harmonic balance method(HBM) and iterative optimization method based on Broyden algorithm are adopted to get the steady-state response. Besides, the influences of different parameters on rotor dynamics are further investigated. Finally, a bilinear stiffness model is utilized to conduct the comparative analysis on the dynamic response of the rod-fastened rotor system. The results show that both models can be used to demonstrate the amplitude jump behavior of the rotor system. However, these two models have different explanations on amplitude jump, so that the dynamic characteristics are different near the unstable region, and the cubic model has a more abundant nonlinear behavior than that of the bi-linear model. The results also show that, by adjusting the nonlinear system parameters, the position of the unstable region in the amplitude-frequency response curve can be changed, thereby effectively preventing the rotor system from operating in an unstable frequency region. © 2019, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.
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页码：43 / 51
页数：8
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