具有初始弯曲变形的裂纹转子-轴承系统的非线性动态特性

Lei Weng, Zichun Yang, Yueyun Cao
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引用次数: 1

摘要

建立了具有初始弯曲变形的裂纹转子-轴承系统的动力学模型,建立了振动特性的动力学方程。采用数值方法分析了裂纹深度和初始弯曲变形对转子系统振动响应的影响。结果表明:有初始弯曲变形的转子临界转速附近混沌区域比无初始弯曲变形的转子混沌区域宽,混沌区域随着裂纹深度的增加而变缓;在浅裂纹情况下,初始弯曲变形的动力现象占主导地位,存在一个周期- 12的短区域,并且大多数是混沌运动。不同初始弯曲变形的转子系统的振动响应随着深度的增加呈现周期性和混沌交替状态。表明本研究有助于进一步认识转子-轴承系统的失效机理。
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The Nonlinear Dynamic Characteristics of a Cracked Rotor-Bearing System with Initial Bend Deformation
The dynamic model of a cracked rotor-bearing system with initial bend deformation was established and a kinetic equation is set up to express the vibration characteristics. Numerical method is adopted to analyze the effects of the depth of crack and the initial bend deformation on the vibration response of the rotor system. The results indicate that, the chaotic region near the critical speed of the rotor with initial bend deformation is wider than that without initial bend deformation, and the chaotic region become slowly as the depth of crack increases. The dynamic phenomena of initial bend deformation play a dominant role in the case of shallow cracks, there is a short region for period-twelve, and most of them are chaotic motion. The vibration response of the rotor system with different initial bend deformation appear periodic and chaotic states alternate as the depth increase. It indicated that this research may contribution to further understanding of the failure mechanism of such a rotor-bearing system.
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