Nonlinear resonances and self-excited oscillations of a rotor caused by radial clearance and collision

Ishida, Yukio; Inagaki, Masahide; Ejima, Rikiya; Hayashi, Akimasa

doi:10.1007/s11071-009-9482-3

Cited by 26 publications

(9 citation statements)

References 12 publications

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“…The motivation for this research work comes from current interest in developing mathematical and computational tools for the dynamics of multibody systems in which the effects of clearance, surface compliance, friction and lubrication in real joints are taken into account [1][2][3][4][5][6]. These phenomena can be included in a multibody system with a spherical joint, and in many applications the function of the mechanical systems strongly depends on them.…”

Section: Introductionmentioning

confidence: 99%

Spatial rigid-multibody systems with lubricated spherical clearance joints: modeling and simulation

2009

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The dynamic modeling and simulation of spatial rigid-multi-body systems with lubricated spherical joints is the main purpose of the present work. This issue is of paramount importance in the analysis and design of realistic multibody mechanical systems undergoing spatial motion.When the spherical clearance joint is modeled as dry contact; i.e., when there is no lubricant between the mechanical elements which constitute the joint, a body-to-body (typically metal-tometal) contact takes place. The joint reaction forces in this case are evaluated through a Hertzian-based contact law. A hysteretic damping factor is included in the dry contact force model to account for the energy dissipation during the contact process. The presence of a fluid lubricant avoids the direct metal-to-metal contact. In this situation, the squeeze film action, due to the relative approaching motion between the mechanical joint elements, is considered utilizing the lubrication theory associated with the spherical bearings. In both cases, the intrajoint reaction forces are evaluated as functions of the geometrical, kinematical and physical characteristics of the spherical joint. These forces are then incorporated into a standard formulation of the system's governing equations of motion as generalized external forces. A spatial four bar mechanism that includes a spherical clearance joint is considered here as example. The computational simulations are carried out with and without the fluid lubricant, and the results are compared with those obtained when the system is modeled with perfect joints only. From the general results it is observed that the system's performance with lubricant effect presents fewer peaks in the kinematic and dynamic outputs, when compared with those from the dry contact joint model.

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Section: Introductionmentioning

confidence: 99%

Spatial rigid-multibody systems with lubricated spherical clearance joints: modeling and simulation

2009

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“…Many studies have been carried out about the impact of the clearance on the contact stresses [8] and also their impact on the rotor-stator collisions and related resonances and self-excited vibrations [9]. Interestingly, influence of joint clearances were also studied [10].…”

Section: Bearing Systemmentioning

confidence: 99%

Design and Analysis of An Integrated Exhaust Manifold with Turbocharger for Considerable Reduction of Over Heating of Bearing System

Joy¹,

Tjprc²

2018

IJMPERD

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“…Ishida et al (83) reported that self-excited oscillations occur in addition to various nonlinear resonance in a system with radial clearance between a bearing holder and a housing. Figure 16 shows the experimental setup and response curves.…”

Section: Self-excited Oscillation Due To Clearancementioning

confidence: 99%

Review of Research on Nonlinear Rotordynamics in Japan

Ishida

2013

JSDD

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This article introduces research on nonlinear rotordynamics in Japan. In most cases, the nonlinearity treated there was weak and it was approximated by a power series of low order. Firstly, the research on various nonlinear resonances due to the weak nonlinearity is introduced. Next, those on more complicated nonlinear phenomena, such as entrainment, internal resonances, chaotic vibrations, nonstationary vibrations, and more complicated systems, such as cracked rotors and continuous rotors, are explained. Then, research on phenomena due to strong nonlinearity is introduced. Various vibration suppression methods where the nonlinearity plays an important role are also explained. Finally, studies on the models representing helicopters and wind turbines are explained.

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Nonlinear resonances and self-excited oscillations of a rotor caused by radial clearance and collision

Cited by 26 publications

References 12 publications

Spatial rigid-multibody systems with lubricated spherical clearance joints: modeling and simulation

Spatial rigid-multibody systems with lubricated spherical clearance joints: modeling and simulation

Design and Analysis of An Integrated Exhaust Manifold with Turbocharger for Considerable Reduction of Over Heating of Bearing System

Review of Research on Nonlinear Rotordynamics in Japan

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