Journal ArticleDOI
Chaotic responses of unbalanced rotor/bearing/stator systems with looseness or rubs
Agnes Muszynska,Paul Goldman +1 more
TLDR
Goldman and Muszynska as discussed by the authors presented results of numerical simulation of the dynamic behavior of a one-lateral-mode unbalanced and radially side-loaded rotor with either a loose pedestal (looseness in a stationary joint), or with occasional rotor-to-stator rubbing.Abstract:
The first part of this paper presents results of numerical simulation of the dynamic behavior of a one-lateral-mode unbalanced and radially side-loaded rotor with either a loose pedestal (looseness in a stationary joint), or with occasional rotor-to-stator rubbing. The nonlinearities of these systems (variable stiffness, impacting, and friction) are associated with the rotor intermittent contacts with the stationary element. The results, based on a newly developed local impact model [P. Goldman and A. Muszynska, Analytical and experimental simulation of loose pedestal dynamic effects on a rotating machine vibrational response, Rotating Machinery Dynamics, DE-Vol. 35, ASME, Miami, Florida, pp. 11–17 (1991); P. Goldman and A. Muszynska, Analytical model of the impact between rotating and nonrotating elements and its application in rotor-to-stator rubbing, BRDRC Report 1, (1992); P. Goldman and A. Muszynska, Chaotic behavior of rotor-to-stator systems with rubs, ASME Turbo EXPO Conference, 93-GT-34, Cincinnati, Ohio, Transactions of the ASME (to appear); P. Goldman and A. Muszynska, Dynamic effects in mechanical structures with gap and impacting: Order and chaos, Trans. of ASME, J. Vibration and Acoustics (1994)] exhibit regular periodic vibrations of synchronous (1×) and subsynchronous ( 1 2 ×, 1 3 × , …) orders, as well as chaotic vibration patterns of the rotor, all accompanied by higher harmonics. The second part of the paper presents experimental vibration characteristics of rotors with looseness or rubs, obtained from rotor rigs. The results display similar patterns as those obtained analytically.read more
Citations
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Journal ArticleDOI
Rotor to stator contacts in turbomachines. Review and application
Georges Jacquet-Richardet,Mohamed Torkhani,Patrice Cartraud,Fabrice Thouverez,T. Nouri Baranger,M. Herran,Claude Gibert,Sébastien Baguet,Patricio Almeida,L. Peletan,L. Peletan +10 more
TL;DR: In this article, a large-scale literature review of rotor-stator contacts with stators is presented, highlighting the phenomenology involved in different rotor to stator contacts configurations and confirming the great complexity of the problems which involve multiphysics and multiscale coupled behaviors.
Journal ArticleDOI
Bolt loosening at rotating joint interface and its influence on rotor dynamics
Zhaoye Qin,Qinkai Han,Fulei Chu +2 more
TL;DR: In this article, the influence of bolt loosening on the rotor dynamics is studied by means of three-dimensional (3D) nonlinear finite element (FE) models, and the motion equations for the rotor with bolt loosenening are deduced accounting for the local stiffness variation caused by the bolt loosens.
Journal ArticleDOI
Bifurcation analysis of an impact oscillator with a one-sided elastic constraint near grazing
TL;DR: In this paper, a linear oscillator undergoing impact with a secondary elastic support is studied experimentally and semi-analytically for near-grazing conditions, and the experimentally observed bifurcations are explained with help from simulations based on mapping solutions between locally smooth subspaces.
Journal ArticleDOI
The application of some non-linear methods in rotating machinery fault diagnosis
TL;DR: It is quite reasonable for effective fault diagnosis to use non-linear diagnostic methods in addition to the methods currently used, such as orbit portrait, FFT spectra, time–frequency analysis, etc.
Journal ArticleDOI
Fixed-point rubbing fault characteristic analysis of a rotor system based on contact theory
TL;DR: In this paper, the fault characteristics of a single span rotor system with two discs are investigated when the rubbing between a disc and an elastic rod (a fixed limiter) occurs, and the simulation results show that different rotor motions appear, such as period-one motion (P1), P2 and P3 with increasing rotating speeds, which are in agreement with the experimental measurements.
References
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Deterministic nonperiodic flow
TL;DR: In this paper, it was shown that nonperiodic solutions are ordinarily unstable with respect to small modifications, so that slightly differing initial states can evolve into considerably different states, and systems with bounded solutions are shown to possess bounded numerical solutions.
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Practical Numerical Algorithms for Chaotic Systems
Thomas S. Parker,Leon O. Chua +1 more
TL;DR: The goal of this book is to present an elementary introduction on chaotic systems for the non-specialist, and to present and extensive package of computer algorithms for simulating and characterizing chaotic phenomena.
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Chaotic Dynamics: An Introduction
Gregory L. Baker,Jerry P. Gollub +1 more
TL;DR: The pendulum's dynamics, characterization of chaotic attractors, and experimental characterization, prediction, and modification of chaotic states suggest that chaotic states broadly applied to numerical integration must be considered.
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Chaotic Vibrations: An Introduction for Applied Scientists and Engineers
Francis C. Moon,Jerry P. Gollub +1 more
TL;DR: A survey of systems with Chaotic Vibrations can be found in this paper, where the authors present a glossary of terms in Chaotic and nonlinear vibrational theory.
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