Influence of rotor’s radial rub-impact on imbalance responses

Yuan, Zheng; Chu, Fulei; Wang, Sanbao; Xi-ming, Yue

doi:10.1016/j.mechmachtheory.2006.09.002

Cited by 12 publications

(2 citation statements)

References 7 publications

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“…In most studies, the rotational parts were considered as a whole in the rubbing system without considering the blade-disk structure and other parts of the rotor system. 1–4 But the blade-casing rubbing is more complex compared with the “rotor-stator rubbing” case because lots of nonlinear phenomena could appear in the former case. 5 Padovan and Choy 6 used a Jeffcott rotor with a cantilever beam blade to conduct a blade-casing fault model, and the influence of unbalance eccentricity and blade stiffness on the rotor dynamics were studied.…”

Section: Introductionmentioning

confidence: 99%

Dynamic characteristics analysis of blade-casing rubbing faults with abradable coatings

Zhang

Lin

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this paper, a dynamic model of a “0-2-1” rotor system with rubbing fault between blade and abradable coated casings is developed. The sub-model of rubbing force considers scraping work energy of coating, casing stiffness, and initial clearance between blade tip and casing. A rotor rig is established and samples of abradable coatings are introduced into the rubbing experiment. Vibration characteristics of the rotor system under blade-casing rubbing fault are analyzed. Effects of rotating speed and initial clearance on the rub force and the system vibration are studied. Results show that the vibration of rotor focuses on the fundamental and multiple fundamental frequencies due to the blade-casing rubbing with the abradable coating. The multiple fundamental frequencies, the 2 × and 3 × in particular, are greatly affected by the rotating speed. The fractional harmonic frequencies are strongly influenced by the initial clearance between the blade tip and casing. Besides, the rotating speed and the initial clearance between the blade tip and abradable coating on the casing also affect the amplitude and distribution of the rub force.

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Section: Introductionmentioning

confidence: 99%

Dynamic characteristics analysis of blade-casing rubbing faults with abradable coatings

Zhang

Lin

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Liu et al [3] established a rub-impact model considering the influence of the speed whirling and the radial-torsional coupling, and analyzed the dynamics characteristics of the radial, the whirl and torsional vibration under no rub, full annual rub and partial rub conditions. Yuanet et al [4] studied the influence of a radial rub-impact on the imbalance response of a rotor and found that the magnitude of the lateral response decreased while that of the torsional response increased with a growing radial rub-impact fault. Although the effects of rotor properties on the rub-impact fault has been studied, the influence of other faults on the rub-impact has not been well discussed, such as how the misalignment could affect the dynamic response of a rub-impact rotor system.…”

Section: Introductionmentioning

confidence: 99%

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.

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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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