Vibration suppression mechanism research of adjustable elliptical journal bearing under synchronous unbalance load

Zhang, Shenglun; Xu, Haibo; Zhang, Lei; Yu, Xiangyao; Guo, Yanan

doi:10.1016/j.triboint.2018.10.043

Cited by 20 publications

(15 citation statements)

References 30 publications

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“…It has been observed that with the adjustment in elliptical ratio, forced vibration can be suppressed upto certain limit. 17 In thermography, the temperature of a component was monitored and an abnormal increase in the temperature showed some incipient problem. The potential of diagnosis has been increased by integrating the temperature, vibration and wear debris analysis.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fault diagnosis of journal bearing in a hydropower plant using wear debris, vibration and temperature analysis: A case study

Ranjan

Ghosh

Kumar³

2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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Analysis of wear debris, vibration and temperature of journal bearing has been integrated to increase the accuracy in fault diagnosis of a hydropower plant. Samples of used lubricating oil, vibration data and bearing temperature at different intervals were collected. Wear particles and acceleration caused by vibration were analysed for the fault detections. An abnormal increase in the temperature and vibrational energy was observed after 200 days of continuous operations. In the last sample, an abnormal increase in aspect ratio of the wear particles was also observed. Scratches and wiping mark were found over the surface of bearing block and side thrust pad. This confirmed the fault of machine by the analysis of condition monitoring data. Further rectification was done by the replacement of bearing block.

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Section: Introductionmentioning

confidence: 99%

“…It has been observed that with the adjustment in elliptical ratio, forced vibration can be suppressed upto certain limit. 17…”

Section: Introductionmentioning

confidence: 99%

Fault diagnosis of journal bearing in a hydropower plant using wear debris, vibration and temperature analysis: A case study

Ranjan

Ghosh

Kumar³

2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…To solve equation ( 4), the method of separation of variables and Sturm-Liouville theory are used. Based on the method of separation of variables, the dimensionless oil film pressure P can written as Pðu; kÞ ¼ P p ðu; kÞ þ P h ðu; kÞ (5) where P p (u, k) is the special solution, P h (u, k) is the general solution, and their expressions are given as P p ðu; kÞ ¼ P p1 ðuÞ þ P p2 ðkÞ (6) P h ðu; kÞ ¼ P h1 ðuÞP h2 ðkÞ…”

Section: Solution Of Nonlinear Oil Film Forcementioning

confidence: 99%

“…Therefore, the dynamic stability of the rotor-bearing system caused by the nonlinear oil film force has investigated by many researchers. [1][2][3][4][5][6] Yang et al 1 established the model of rotor with transverse crack by considering parametric uncertainties. And the equation of the system was solved by the Harmonic Balance method.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the dynamic behaviors of a rod fastening rotor based on an analytical solution of the oil film force of the supporting bearing

Hei

Zheng

2020

Journal of Low Frequency Noise, Vibration and Active Control

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The dynamic characteristics of rod fastening rotor supported by a finite journal bearing are investigated in this study. To model the dynamic behaviors of the bearing-rotor system, the oil film force of bearing is calculated by approximately solving the Reynolds equation with the variables separation method and Sturm–Liouville theory, and then a motion equation is developed with consideration of the contact and gyro effects of the disks of the rotor. To solve the motion equation with small error and excellent stability, an improved Newmark method is proposed. On this basis, the dynamics characteristics of the rod fastening rotor are analyzed for different rotor speeds, disk eccentricities, shaft bearing stiffness, and contact stiffness. And the orbits of the rod fastening rotor and integral rotor are compared. The numerical results indicate that the analytical solution of the oil film force has higher computational efficiency than the finite difference method. The rod fastening rotor shows higher stability than the integral rotor, and exhibits rich dynamic behaviors, such as periodic, qusi-periodic, period-2, period-4, and period-6.

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“…The active bearing technology uses the technique of continuous adjustment of the fluid film either by secondary oil injection or by adjusting the bearing elements. 22–25 Further, the pure radial or tilt adjustment are the two commonly used bearing element adjustment techniques. 26,27 Modern active bearing technology uses the sensors and actuators to obtain the accurate position of the journal during the crossover period at the critical speed 28–30 A PID controller and a state feedback control system effectively reduces the lateral vibration during the critical speed crossover.…”

Section: Introductionmentioning

confidence: 99%

Multi-objective optimization and significant analysis of bearing element adjustments on the static performance of an innovative adjustable bearing through design of experiment

Ganesha

Pai

Rao

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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Real-time position control of the journal in a hydrodynamic bearing demands continuous modification of the film thickness. Innovative adjustable bearings offer film thickness modifications in radial and circumferential directions through the flexible bearing elements. The position of the journal depends on the bearing element adjustments and the operating parameters. These adjustments also affect the static characteristic of the bearings. Hence, the position control requires an in-depth knowledge of the effects of bearing element adjustments on the bearing characteristics. In this paper, the main effect and the interaction effects of symmetric adjustment configuration of an innovative adjustable bearing at three levels are investigated through Taguchi method and ANOVA. Grey relational analysis is used to obtain the optimum bearing element adjustment. The results show that radial adjustment has the greatest influence on the attitude angle and tilt adjustment has a significant influence on the non-dimensional side leakage. The positive tilt, negative radial adjustment at 0.4 eccentricity ratio is the optimum bearing element adjustment for achieving a better static performance of innovative adjustable bearings.

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Vibration suppression mechanism research of adjustable elliptical journal bearing under synchronous unbalance load

Cited by 20 publications

References 30 publications

Fault diagnosis of journal bearing in a hydropower plant using wear debris, vibration and temperature analysis: A case study

Fault diagnosis of journal bearing in a hydropower plant using wear debris, vibration and temperature analysis: A case study

Investigation on the dynamic behaviors of a rod fastening rotor based on an analytical solution of the oil film force of the supporting bearing

Multi-objective optimization and significant analysis of bearing element adjustments on the static performance of an innovative adjustable bearing through design of experiment

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