Experimental observations on rotor-to-stator contact

Ehehalt, Ulrich; Alber, Oliver; Markert, Richard; Wegener, Georg

doi:10.1016/j.jsv.2019.01.008

Cited by 26 publications

(5 citation statements)

References 14 publications

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“…2.2 The motion equations of the rotor system with loose disc Figure 2 The model of the rotor system with loose disc Figure 2 shows the rotor system with concentrated mass [19]. In the case of ignoring the gyroscopic effect, the contact model of disc-shaft considering the topography of microscopic surface is more advantageous for analysis.…”

Section: Mathematical Model 21 the Contact Model Of Disc-shaftmentioning

confidence: 99%

Vibration Characteristics of Rotor System with Loose Disc Caused by the Insufficient Interference Force

Li¹,

Qiao²,

Wei³

et al. 2020

Preprint

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The loose of mechanical parts is one of the common failures in rotating machinery. The current researches of loose fault mainly focus on non-rotating components. However, the loose of disc, which is the main work part in the rotor system, is less paid attention, and the mechanism and dynamics characteristics of the loose fault are also almost ignored. In this paper, a dynamic contact model of the rotor system with loose disc is established considering the microscopic surface topography. Through the numerical simulation, the vibration characteristics of the disc-shaft rotor system are analyzed and discussed. The simulation results are further verified by experiments. The results show that the rotation state of the disc is affected by the rotation speed of the shaft, contact stiffness, a gap between the disc and shaft, damping of the disc, and the rotational damping. When the speed difference between the disc and shaft is zero or large, the collision frequency is mainly composed of one frequency component. When the rotational speed of the disc approaches the shaft, the beating vibration phenomenon of the disc occurs in the horizontal direction. As the decreases of relative speed between the disc and shaft, the disc trajectory changes from ‘circular’ to ‘double ring’ and then ‘circular’. The research results on nonlinear dynamics characteristics of the loose disc has important theoretical value and practical application value, and makes up for its shortcomings in the rotor system with loose disc.

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Section: Mathematical Model 21 the Contact Model Of Disc-shaftmentioning

confidence: 99%

Vibration Characteristics of Rotor System with Loose Disc Caused by the Insufficient Interference Force

Li¹,

Qiao²,

Wei³

et al. 2020

Preprint

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“…Despite of the design simplicity there are no results of mathematical and natural modeling for the outer rotorinner stator system and its unseparated dynamics. And this is despite the rather extensive and fresh scientific and technical literature on a similar problem for a typical rotor system with outside stator [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Rolling and whip phenomenon of hollow rotor slipping on internal stator

Никифоров¹

2023

Math. models, eng.

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Dynamic features of a rotor that rolls without or with whipping and slipping of own inner surface on a rigid stator are discussed. Change in the whirling direction associated with the rolling of the rotor from backward to forward was confirmed experimentally, i.e. in the case of an internal type for the stator-limiter in the direction of rotor rotation. Identification of dynamic behavior is made on the basis of eigenfrequencies and eigenmodes, motion orbits of an eccentric point (on the rotor), Campbell diagrams and AFC. The calculation of such characteristics has done using an original mathematical approach developed by the author earlier in order to describe the backward motion of common rotor on an external stator. A good agreement is obtained between the theoretical frequencies and amplitudes of vibration and the experimental ones. Therefore, the author’s technique is also suitable for the revealed forward rotor motion around the internal stator.

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“…In rotordynamics, many of the early models were very simple, such as the Jeffcott model, but adequate to explain some phenomena seen in real machinery such as critical speeds and forward and backward whirl. In fact, this model is still used today to study complex rotordynamics effects such as rubbing [1] and cracked rotors [2]. Although the Jeffcott model is a useful approach to rotordynamics, most of the design and study of rotating machines is done by the Finite Element Method (FEM) [3,4,5,6].…”

Section: Introductionmentioning

confidence: 99%