Review of Research on Nonlinear Rotordynamics in Japan

Ishida, Yukio

doi:10.1299/jsdd.7.151

Cited by 5 publications

(1 citation statement)

References 116 publications

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“…Analysis of chaotic dynamics of rotating machines has been an important topic in rotor-dynamics area in recent years. Ishida [1] reviewed the research on the nonlinear vibration and chaos in rotordynamics field. That paper covered the nonlinearity in restoring and damping forces such as clearances in bearings, squeeze film dampers, oil films in journal bearings, magnetic forces, seals, frictions and stiffening effect in rotating shaft systems.…”

Section: Introductionmentioning

confidence: 99%

Chaos and Bifurcation in Nonlinear Inextensional Rotating Shafts

Hosseini

2018

Scientia Iranica

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In this paper, bifurcation and chaotic behavior of in-extensional rotating shafts are investigated. The shaft is modeled as a Rayleigh simply supported beam, spinning with constant rotational speed. Using two-mode Galerkin truncation, the partial differential equations of motion are discretized and then with the aid of numerical simulations, the dynamical behavior of the rotating shaft is studied. Using tools from nonlinear dynamics, such as time history, bifurcation diagram, Poincaré map, Lyapunov exponents, and amplitude spectra, a comprehensive analysis is made to characterize the complex behavior of the rotating shaft. Periodic (synchronous), quasiperiodic, chaotic and transient chaotic responses are observed in the neighborhood of the second critical speed. The effect of rotary inertia and damping on the dynamics of the rotating shaft is considered. It is shown that the chaotic response is possible for a shaft with weak nonlinearity without the existence of any internal resonance.

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Section: Introductionmentioning

confidence: 99%

Chaos and Bifurcation in Nonlinear Inextensional Rotating Shafts

Hosseini

2018

Scientia Iranica

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On modeling and damage detection methodologies in rotor systems

Abdul Nasar,

Alzarooni,

AL-Shudeifat

2024

Nonlinear Dyn

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Damages in rotor systems have severe impact on their functionality, safety, running durability and their industrial productivity, which usually leads to unavoidable economical and human losses. Rotor systems are employed in extensive industrial applications such as jet engines, gas and steam turbines, heavy-duty pumps and compressors, drilling tools, and in other machineries. One of the major damages in such systems is the propagation of fatigue cracks. The heavy-duty and recurrent cyclic fatigue loading in rotor systems is one of the main factors leading to fatigue crack propagation. For the past few decades, numerous research have been conducted to study crack related damages and various methodologies were proposed or employed for damage detection in rotor systems. Therefore, the purpose of the present review article is to provide a thorough analysis and evaluation regarding the associated research related to the modeling aspects of rotor systems that are associated with various kinds of (rotor related) damages. Based on this review, it is observed that the crack modeling, especially with the breathing crack type in rotor systems, is still based on few primary models. Several researchers, based on different assumptions, have extended and modified such models to be more reliable for analysis. Moreover, the arising demand for early crack detection has led to utilization of various tools such as Fast Fourier transform, Hilbert Huang transform, wavelet transform, whirling analysis, energy methods, and the correlation between backward whirling and rotor faults etc. In addition, the significant impact of nonsynchronous whirl within resonance zones of rotor systems on post-resonance backward whirl, under various rotor related faults, is also highlighted in the present review. Therefore, the review provides an evaluation and comparison between several crack models and detection methodologies in rotor systems. Moreover, this review could help in identifying the gaps in modeling, simulation, and dynamical analysis of cracked rotor systems to establish robust research platform on cracked rotor systems.

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Semi-analytical predictions of multi-stable independent periodic motions and bifurcation evolution in a nonlinear bolted rotor system

Zhao,

Jiao,

et al. 2024

Communications in Nonlinear Science and Numerical Simulation

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Review of Research on Nonlinear Rotordynamics in Japan

Cited by 5 publications

References 116 publications

Chaos and Bifurcation in Nonlinear Inextensional Rotating Shafts

Chaos and Bifurcation in Nonlinear Inextensional Rotating Shafts

On modeling and damage detection methodologies in rotor systems

Semi-analytical predictions of multi-stable independent periodic motions and bifurcation evolution in a nonlinear bolted rotor system

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