A touchdown bearing with surface waviness: A dynamic model using a multibody approach

Halminen, Oskari; Aceituno, Javier F.; Escalona, José L.; Sopanen, Jussi; Mikkola, Aki

doi:10.1177/1464419317689946

Cited by 3 publications

(2 citation statements)

References 34 publications

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“…Their research suggested that, for a bearing operating at high speed, the waviness in the outer race results in higher vibration in the system, compared to waviness in the inner race. Recently, Halminen et al [15,16] used a multibody approach and studied the waviness of touchdown bearings in an active magnetic bearing supported system. In the event of contact, the highest effect of surface waviness was observed for case studies with inner race eccentricity and ellipticity.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Subcritical Vibrations of a Large Flexible Rotor with Varying Spherical Roller Bearing Clearance and Roundness Profiles

et al. 2020

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In large rotor-bearing systems, the rolling element bearings act as a considerable source of subcritical vibration excitation. Simulation of such rotor bearing systems contains major sources of uncertainty contributing to the excitation, namely the roundness profile of the bearing inner ring and the clearance of the bearing. In the present study, a simulation approach was prepared to investigate carefully the effect of varying roundness profile and clearance on the subcritical vibration excitation. The FEM-based rotor-bearing system simulation model included a detailed description of the bearings and asymmetricity of the rotor. The simulation results were compared to measured responses for validation. The results suggest that the simulation model was able to capture the response of the rotor within a reasonable accuracy compared to the measured responses. The bearing clearance was observed to have a major effect on the subcritical resonance response amplitudes. In addition, the simulation model confirmed that the resonances of the 3rd and 4th harmonic vibration components in addition to the well-known 2nd harmonic resonance (half-critical resonance) can be significantly high and should thus be taken into account already in the design phase of large subcritical rotors.

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Section: Introductionmentioning

confidence: 99%

Simulation of Subcritical Vibrations of a Large Flexible Rotor with Varying Spherical Roller Bearing Clearance and Roundness Profiles

et al. 2020

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“…Few studies have focused on the influence of the waviness in touchdown bearing application. Recently, Halminen et al [32,33] developed a multibody model of the touchdown bearing including surface waviness. They investigated the effect of 1 st , 2 nd and 3 rd order surface waviness in the bearing races in the calculation of the friction loss in the touchdown bearing.…”

Section: Introductionmentioning

confidence: 99%

Influence of surface waviness in the heat generation and thermal expansion of the touchdown bearing

Neisi

Heikkinen

Sopanen

2019

European Journal of Mechanics - A/Solids

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In an active magnetic bearings (AMBs) supported rotor system, the touchdown bearings have been proposed to support the rotor during an electromagnetic field shortage. The heat generation due to the high impact and collision of the rotor and touchdown bearing, in addition to the internal friction in the bearing, raises the temperature of the touchdown bearing. In this work, a numerical model is applied to simulate the rotor dropdown where the FEmodel of the rotor is integrated with the dynamic and thermal model of the touchdown bearing. The rotor that is used as a case study is supported by a deep groove ball bearing and a pair of angular contact ball bearings installed in an X-configuration. The present study focuses on evaluating different orders of surface waviness in a pair of angular contact ball bearings. The equivalent electrical circuit model is implemented for computing the thermal behavior of the touchdown bearing. Results indicated that the dynamic friction coefficient between the rotor and inner race has a considerable impact on bounce height and the whirling motion of the rotor. Furthermore, for a certain amplitude of surface waviness, the effect of various orders of waviness is investigated and it has been found that surface waviness of the bearing alters the contact force and friction loss in the touchdown bearing. In addition, the effect of a higher amplitude of surface waviness on thermal expansion of the touchdown bearing is studied.

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A touchdown bearing with surface waviness: Friction loss analysis

Halminen

Aceituno

Escalona

et al. 2017

Mechanism and Machine Theory

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A touchdown bearing with surface waviness: A dynamic model using a multibody approach

Cited by 3 publications

References 34 publications

Simulation of Subcritical Vibrations of a Large Flexible Rotor with Varying Spherical Roller Bearing Clearance and Roundness Profiles

Simulation of Subcritical Vibrations of a Large Flexible Rotor with Varying Spherical Roller Bearing Clearance and Roundness Profiles

Influence of surface waviness in the heat generation and thermal expansion of the touchdown bearing

A touchdown bearing with surface waviness: Friction loss analysis

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