Dynamic characteristics analysis of a misaligned rotor-bearing system with squeeze film dampers

Ma, Liang; Zhang, Junhong; Lin, Jiewei; Wang, Jun; Lu, Xin

doi:10.1631/jzus.a1500111

Cited by 20 publications

(10 citation statements)

References 40 publications

(35 reference statements)

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“…According to the pervious study [12], it is found that most of the oil film clearances in the contact zone are nearly unchanged, so the central oil film clearance can be used as equivalent. In the case of point-contact, the oil film thickness equation is suitable for the ball bearing:…”

Section: Ball Bearingmentioning

confidence: 99%

“…To examine the rotor model, a group of experimental results [12] under different misalignments are used. The comparison between the simulation and the experiments are given in Table 2 and Fig.…”

Section: Rotor System Modelmentioning

confidence: 99%

“…Zhang and Ma [11] studied dynamic responses of a rotor-ball-bearing system with a misalignment and rub-impact coupling fault, in which the effect of the Elasto-Hydrodynamic Lubrication (EHL) on system dynamics was the main content. They also established a two-stage rotor system connected by a gear coupling and supported on ball bearings and study the non-linear dynamics of the system under misalignment fault [12]. But they only studied the dynamic characteristics of misalignment-rubbing fault, but less studied on the influence factors on the rub characteristics.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of misalignment on the nonlinear dynamics of a two-shaft rotor-bearing-gear coupling system with rub-impact fault

Lu¹,

Zhang²,

Ma³

et al. 2017

J. vibroeng.

Self Cite

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In rotor-bearing system, the misalignment can lead to secondary faults, such as the rub-impact fault. How the development of misalignment could affect the rub-impact force and other dynamic responses is important for the vibration control and fault diagnosis of rotor system. In this paper, a mathematical model of a two-shaft rotor-bearing-gear coupling system is established. The model is validated through the misaligned force of gear coupling, the supporting force of the lubricated ball bearing and the whole rotor response. To overcome the limit of traditional approaches and further dig out fault characteristics, the time-frequency method is introduced to analyze the dynamic response from both the time and frequency domains points of view. It is found the misalignment effect on rotor dynamic responses is mainly focused in high rotating speed range. The development of misalignment has an obvious adverse effect on the rotor stability. Some intermittent components in low frequency range due to the occurrence and development of misalignment can be found affecting the rotor stability at low speed range, and the high frequency rub-impact components can be found responsible for the unstable state of rotor.

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Section: Ball Bearingmentioning

confidence: 99%

Section: Rotor System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of misalignment on the nonlinear dynamics of a two-shaft rotor-bearing-gear coupling system with rub-impact fault

Lu¹,

Zhang²,

Ma³

et al. 2017

J. vibroeng.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Many scholars focused on the dynamic characteristics of the rotor system affected by SFD [13][14][15]. Previous work on SFD on a two-disk rotor system with misalignment and the effects of SFD was discussed [16].…”

Section: Introductionmentioning

confidence: 99%

“…On the basis of previous work [16], this paper developed a model of bearing which considered both Hertz contact and elastohydrodynamic lubrication. This model was focused on studying the fault characteristics of the rotor system caused by inner race defects.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Analysis of a Rotor-Bearing-SFD System with the Bearing Inner Race Defect

Zhang

Lin

et al. 2017

Shock and Vibration

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In this paper, the dynamic behavior of a rotor-bearing-SFD system with the inner race defect of bearing is investigated. The contact force between the rolling element and the race is calculated in Hertzian contact and elastohydrodynamic lubrication condition. The supporting force of the SFD is simulated by integrating the pressure distribution derived from Reynolds's equation. The equations of motion of the rotor-bearing-SFD system are derived and solved using the fourth-order Runge-Kutta method. The dynamic behavior and the fault characteristics are analyzed with two configurations of the SFD: (1) mounted on the unfaulted bearing and (2) mounted on the faulty bearing. According to the analysis of time-frequency diagram, waterfall plot, and spectral diagram, the results show that the characteristics of inner race defects on bearing frequencies are related to the characteristic multiple frequency of the inner race defect and the fundamental frequency. The speed and defect width have different influence on the distribution and amplitude of frequency. The SFD can enhance the system stability under the bearing fault but the enhancement decreases with the increasing speed. Meanwhile, the beneficial effect of the SFD varies according to the mounted position in the rotor system.

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Development and stability analysis of a high‐speed train bearing system under variable speed conditions

Wang

Liu

Zhang

et al. 2022

Int Journal of Mech Sys Dyn

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During a high‐speed train operation, the train speed changes frequently, resulting in motion change as a function of time. A dynamic model of a double‐row tapered roller bearing system of a high‐speed train under variable speed conditions is developed. The model takes into consideration the structural characteristics of one outer ring and two inner rings of the train bearing. The angle iteration method is used to determine the rotation angle of the roller within any time period, solving the difficult problem of determining the location of the roller. The outer ring and inner ring faults are captured by the model, and the model response is obtained under variable speed conditions. Experiments are carried out under two fault conditions to validate the model results. The simulation results are found to be in good agreement with the results of the formula, and the errors between the simulation results and the experimental results when the bearing has outer and inner ring faults are found to be, respectively, 5.97% and 2.59%, which demonstrates the effectiveness of the model. The influence of outer ring and inner ring faults on system stability is analyzed quantitatively using the Lempel–Ziv complexity. The results show that for low train acceleration, the inner ring fault has a more significant effect on the system stability, while for high acceleration, the outer ring fault has a more significant effect. However, when the train acceleration changes, the outer ring has a greater influence. In practice, train acceleration is usually small and does not frequently change in one operation cycle. Therefore, the inner ring fault of the bearing deserves more attention.

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Dynamic characteristics analysis of a misaligned rotor-bearing system with squeeze film dampers

Cited by 20 publications

References 40 publications

Effects of misalignment on the nonlinear dynamics of a two-shaft rotor-bearing-gear coupling system with rub-impact fault

Effects of misalignment on the nonlinear dynamics of a two-shaft rotor-bearing-gear coupling system with rub-impact fault

Dynamic Analysis of a Rotor-Bearing-SFD System with the Bearing Inner Race Defect

Development and stability analysis of a high‐speed train bearing system under variable speed conditions

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