Dynamic Behavior of the Full Rotorstop Rubbing: Numerical Simulation and Experimental Verification

Dai, Xiaolin; Jin, Zhe; Zhang, Xi

doi:10.1006/jsvi.2001.3998

Cited by 36 publications

(22 citation statements)

References 11 publications

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“…Bartha [7,8] investigated theoretically and experimentally the dry friction backward whirl motion. This study and the work of Bartha [7] and Dai et al [13] have shown that for some cases it is possible to stop the rotor spin under rubbing conditions and impacts due to the friction. In addition, Choi [9] also conducted experimental as well as numerical analyses to study the effect of the friction coefficient and the eccentricity between the rotor and stator that can explain the onset of backward rolling and backward slipping.…”

Section: Introductionmentioning

confidence: 59%

On The Nonlinear Dynamics of Two Types of Backup Bearings — Theoretical and Experimental Aspects

Lahriri

Santos

Weber

et al. 2012

Journal of Engineering for Gas Turbines and Power

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The possible contact between rotor and stator canfor some cases be considered a serious malfunction that may lead to catastrophic failure. Rotor rub is considered a secondary phenomenon caused by a primary source that leads to a disi'uption of the normal operational condition. It arises from sudden mass unbalance, instabilities generated by aerodynamic and hydrodynamic forces in seals and bearings among others. The contact event gives rise to normal and friction forces exerted on the rotor at impact events. The friction force plays a significant role by transferring some rotational energy of the rotor to lateral motion, impacting the stator. This event results in persistent coupled lateral vibration of the rotor and stator. This paper proposes a new unconventional backup bearing design in order to reduce the rub reiated severity in friction. The idea is to utilize pin connections that center the rotor during impacts. In this way, the rotor is forced to the center and the lateral motion is mitigated. The four pins are passively adjustable, which allows the clearance to be customized. A mathematical model has been developed to capture phenomena arising from impact for the conventional backup bearing (annular guide) and for the new disk-pin backup bearing. For the conventional annular guide setup, it is reasonable to superpose an impact condition to the rub, where the rotor spin energy can be fully transformed into rotor lateral movements. Using a nonideal drive, i.e., an electric motor without any kind of velocity feedback control, it is even possible to almost stop the rotor spin under rubbing conditions. All the rotational energy will be transformed in a kind of "self-excited" rotor lateral vibration with repeated impacts against the housing. The vibration of the housing is coupled through the interaction force. The experimental and numerical analysis shows that for the conventional annular guide setup, the rotational energy is fully transformed into lateral motion and the rotor spin is stopped. However, by employing the new disk-pin design the anaiysis shows that the rotor at impact is forced to the center of the backup bearing and the lateral motion is mitigated. As a result of this, the rotor spin is kept constant.

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Section: Introductionmentioning

confidence: 59%

On The Nonlinear Dynamics of Two Types of Backup Bearings — Theoretical and Experimental Aspects

Lahriri

Santos

Weber

et al. 2012

Journal of Engineering for Gas Turbines and Power

View full text Add to dashboard Cite

show abstract

“…The effects of rotating speed, clearance, damping coefficient, friction coefficient, and boundary stiffness were analyzed. Dai et al [10] have investigated the dynamic behavior of a rotor rubbing with a motion-limiting stop. The stop was found to be effective in the suppression of the violent vibration amplitude of the rotor.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis on fault detection for a direct coupled rotor-bearing system

2013

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“…Al-Bedoor [4] studied the rotor-stator rubbing and then presented a model for the coupled torsional and lateral vibrations of the unbalanced rotor. Dai et al [5] investigated the dynamic behaviour of a rubbing rotor, especially rubbing fully with a motion-limiting stop by numerical and experimental methods. Sun et al [6] applied modern nonlinear dynamics theory to analyse the complicated characteristics of a high-speed rotor system and investigated the impacts caused by rubbing.…”

Section: Introductionmentioning

confidence: 99%

Detection of the rubbing-caused impacts for rotor–stator fault diagnosis using reassigned scalogram

Peng

Chu

Tse

2005

Mechanical Systems and Signal Processing

107

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Dynamic Behavior of the Full Rotorstop Rubbing: Numerical Simulation and Experimental Verification

Cited by 36 publications

References 11 publications

On The Nonlinear Dynamics of Two Types of Backup Bearings — Theoretical and Experimental Aspects

On The Nonlinear Dynamics of Two Types of Backup Bearings — Theoretical and Experimental Aspects

Experimental analysis on fault detection for a direct coupled rotor-bearing system

Detection of the rubbing-caused impacts for rotor–stator fault diagnosis using reassigned scalogram

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