Detailed ball bearing model for magnetic suspension auxiliary service

Sun, Guorong; Palazzolo, Alan; Provenza, Andrew J.; Montague, Gerald T.

doi:10.1016/s0022-460x(03)00207-4

Cited by 43 publications

(33 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In 2003, Zeng [4] studied the dynamic behavior of the rotor drop onto the auxiliary bearing with different supporting conditions, found out the critical friction coefficient causing the backward whirling, and claimed the low friction coefficient and soft support can reduce the contact force and the possibility of occurring backward whirl. Sun et al [5][6][7] considered rotor drop simulation of a flywheel energy storage system, numerically and experimentally. The results suggested therefore that the life of the auxiliary bearing can be extended by reducing auxiliary bearing clearance, dropping velocity, contact friction, and support stiffness, applying static side-loads and increasing support.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Behavior Analysis of Touchdown Process in Active Magnetic Bearing System Based on a Machine Learning Method

Sun

Yan

Zhao

et al. 2017

Science and Technology of Nuclear Installations

View full text Add to dashboard Cite

Magnetic bearings are widely applied in High Temperature Gas-cooled Reactor (HTGR) and auxiliary bearings are important backup and safety components in AMB systems. The performance of auxiliary bearings significantly affects the reliability, safety, and serviceability of the AMB system, the rotating equipment, and the whole reactor. Research on the dynamic behavior during the touchdown process is crucial for analyzing the severity of the touchdown. In this paper, a data-based dynamic analysis method of the touchdown process is proposed. The dynamic model of the touchdown process is firstly established. In this model, some specific mechanical parameters are regarded as functions of deformation of auxiliary bearing and velocity of rotor firstly; furthermore, a machine learning method is utilized to model these function relationships. Based on the dynamic model and the Kalman filtering technique, the proposed method can offer estimation of the rotor motion state from noisy observations. In addition, the estimation precision is significantly improved compared with the method without learning. The proposed method is validated by the experimental data from touchdown experiments.

show abstract

Section: Introductionmentioning

confidence: 99%

Dynamic Behavior Analysis of Touchdown Process in Active Magnetic Bearing System Based on a Machine Learning Method

Sun

Yan

Zhao

et al. 2017

Science and Technology of Nuclear Installations

View full text Add to dashboard Cite

show abstract

“…2 Sun et al presented a detailed ball bearing model for magnetic suspsension CB. 3 Kirk et al provided the test results for 38 rotor drops with varying rotor speed, unbalance amplitude and location. 4 Other researches focused on new type of CBs, such as zero clearance auxiliary bearing 5 and hybrid air foil auxiliary bearing.…”

Section: Introductionmentioning

confidence: 99%

Dynamic responses of the rotor supported by a new type zero-clearance catcher bearing

Zhu

Zheng

2017

Mod. Phys. Lett. B

View full text Add to dashboard Cite

Catcher bearings (CB) are required to support the rotor rotating for some time when a failure event of active magnetic bearing (AMB) system occurs. For this purpose, a new type zero-clearance catcher bearing (NTZCB) is proposed. The influences of different parameters of NTZCB on the rotor dynamic responses are theoretically and experimentally analyzed. The results indicate that choosing relatively soft spring and heavy moveable supporting pedestal can effectively buffer the rotor vibrations, which makes it possible for the rotor to keep rotating with the support of the CB system for a long time.

show abstract

“…4 Sun et al conducted numerical simulations of a rotor drop onto the CB in flywheel energy storage system using a detailed CB model. 5,6 Hawkins et al experimentally analyzed the rotor dynamic responses during rotor drop. 7 Also some other researchers focused on new type of CB, such as zero clearance auxiliary bearing 8 and hybrid air foil auxiliary bearing.…”

Section: Introductionmentioning

confidence: 99%

The use of double-decker catcher bearing with face-to-face installed inner layer bearings

Zhu

Zheng

2017

Mod. Phys. Lett. B

View full text Add to dashboard Cite

In active magnetic bearing (AMB) system, the catcher bearings (CB) are indispensable to temporarily support the rotor from directly impacting the stators. In most cases, traditional CB cannot bear the ultra-high speed, vibrations and impacts after a rotor drop event. To address the shortcomings, a double-decker ball bearing (DDBB) with inner two face-to-face angular contact ball bearings are proposed to be used as CB in an AMB system, and the dynamic response of the rotor after a rotor drop event is experimentally analyzed. The results indicate that using a DDBB as a CB helps to reduce the following collision forces after a rotor drop. Larger ball initial contact angles and smaller pre-load force on the inner layer bearings, larger radial clearance of the outer layer bearing and choosing AISI 10AISI 1045 steel which has a larger density for the adapter ring can effectively reduce the maximum impact force after a rotor drop event.

show abstract

Detailed ball bearing model for magnetic suspension auxiliary service

Cited by 43 publications

References 5 publications

Dynamic Behavior Analysis of Touchdown Process in Active Magnetic Bearing System Based on a Machine Learning Method

Dynamic Behavior Analysis of Touchdown Process in Active Magnetic Bearing System Based on a Machine Learning Method

Dynamic responses of the rotor supported by a new type zero-clearance catcher bearing

The use of double-decker catcher bearing with face-to-face installed inner layer bearings

Contact Info

Product

Resources

About