Nonlinear dynamic characteristics of a flexible rotor system with local rub-impact

4th Symposium on the Mechanics of Slender Structures

物理学;力学

Ma, H.^1 ; Tai, X.Y.^1 ; Yi, H.L.^2 ; Lv, S.^1 ; Wen, B.C.^1

School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China^1

Shenyang Blower Works Group Corporation, Shenyang, 110869, China^2

关键词: Continuous spectrum;    Coulomb friction models;    Degree of freedom models;    Flexible rotor systems;    Frequency components;    Gyroscopic Effects;    Nonlinear dynamic characteristics;    Vibration waveforms;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/448/1/012015/pdf
DOI  :  10.1088/1742-6596/448/1/012015

学科分类：力学，机械学

来源: IOP

【 摘 要 】

In this paper, nonlinear dynamic characteristics of a single span rotor system with two discs are investigated under fixed-point and local arc rub-impact conditions. A twenty-degree-of-freedom model considering the gyroscopic effect is developed, the simple Coulomb friction model and piecewise linear spring model to describe the contact between the rotor and the stator. The vibration chracteristics of the rotor system with two types of rub-impact forms are analyzed with respect to the effects of rotating speed by using spectrum cascades, vibration waveforms, orbits and frequency spectra. The simulation results show that different rotor motions appear, such as P1(period-1), P2, P3 and P4 with the increasing rotating speed under two rub-impact conditions. And some combination frequency components and continuous spectra appear under the local arc rub-impact condition, which are different from those under the fixed-point rub-impact condition.