Effect of the Supports’ Positions on the Vibration Characteristics of a Flexible Rotor Shafting

Li, Miaomiao; Li, Zhuo; Ma, Liangliang; Zhu, Rupeng; Ma, Xing

doi:10.1155/2020/1592794

Cited by 2 publications

(1 citation statement)

References 9 publications

(8 reference statements)

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“…They pointed out that the oil film dynamic characteristic parameters have time-varying characteristics. Li et al [5] showed that the larger the rotor vortex radius, the stronger the static eccentricity of the damper on the rotor vibration; the larger the static eccentricity of the SFD, the smaller the rotor vibration amplitude (but the risk of nonlinear vibration increases rapidly); when the damper eccentricity ratio is too large, the oil film may be touching, exciting the rotor counter-advancement of the intrinsic frequency; and the vibration amplitude shows violent fluctuations during the phenomenon. Feng et al [6] conducted a comparative experimental study on the vibration damping properties of concentric and non-concentric SFDs.…”

Section: Introductionmentioning

confidence: 99%

Study of the Effect of Static Eccentricity on Vibration Damping Properties of Squeeze Film Dampers Considering the Two-Phase Flow Case

Zhou,

Fang,

Zhang

et al. 2024

Lubricants

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To analyze the effect of static eccentricity on the air ingestion distribution and vibration damping properties of the SFD, a numerical simulation study of SFDs considering two-phase flow was carried out based on CFD using a transient solution method and dynamic mesh technique. The results show that the angle between the static eccentricity direction and the circumferential direction of the oil supply hole increases and the air ingestion area in the oil film expands. In contrast, the oil film damping decreases, and the larger the static eccentricity distance, the greater its effect on the air ingestion area in the oil film. When the circumferential angle is small, the oil film damping increases with the increase of static eccentricity distance, and when the circumferential angle is large, the oil film damping decreases with the increase of static eccentricity distance and then increases. With the increase of static eccentricity distance, the air ingestion area at both ends of the oil film increases. At the same time, studying the effect of dynamic eccentricity shows that as the dynamic eccentricity increases, the oil film damping first decreases and then increases, and the air ingestion area increases. Comparing the 1 hole, the 2 hole, and the 3 hole oil supplies, the air ingestion area is significantly larger in the 1 hole oil supply than in the 2 hole or the 3 hole oil supplies, and the oil film damping of the 1 hole oil supply is smaller than the oil film damping of the 2 hole or the 3 hole oil supplies. It can be seen from the present study that in the actual installation of the SFD, when the circumferential angle is less than 60°, the static eccentricity can be increased appropriately. When the circumferential angle is greater than 60°, the static eccentricity can be appropriately reduced.

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Section: Introductionmentioning

confidence: 99%

Study of the Effect of Static Eccentricity on Vibration Damping Properties of Squeeze Film Dampers Considering the Two-Phase Flow Case

Zhou,

Fang,

Zhang

et al. 2024

Lubricants

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A Predictive Analysis Method of Shafting Vibration for the Hydraulic-Turbine Generator Unit

Wang

Shang

Yao

2022

Water

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The shafting vibration for the Hydraulic-Turbine Generator Unit (HGU) inevitably affects the safe and stable operation of the Units. Excessive shafting vibration could cause fatigue damage of materials, which eventually leads to malfunction of HGU and even results in damage accidents in serious cases. Generally speaking, the vibration is mainly generated from the high-speed rotation of the shafting, and mechanical, hydraulic, and electrical factors as the vibration exciting sources may be coupled all to cause a vibration of the HGU, so it is necessary to take the whole shafting as a specific object of study. In recent years, many scholars have conducted much research on them and their results are focused more on how to control the influence of external excitation sources of vibration, but still lack consideration of the shafting’s internal mechanism of vibration. In this paper, a predictive analysis method is proposed to reveal the internal mechanism of vibration. Starting from the analysis of natural vibration characteristics of the shafting, this study establishes the finite element calculation model of the shafting of the HGU based on the finite element analysis method. By selecting appropriate research methods and calculation procedures, the modal analysis of the dynamic characteristics of the shafting structure is carried out. Finally, the first ten-order natural vibration characteristics and critical rotational speed of the shafting structure are successfully calculated, and the results conform to the basic laws of shafting vibration. In addition, by comparing the relationship between rotational frequency such as the rated speed, runaway speed, and critical speed of the shafting, the possibility of resonance of the HGU is analyzed and predicted, and then some suggestions for optimization design such as increasing the shafting’s stiffness and balancing its mass distribution are proposed. Therefore, this study provides a basis for guiding the structural design and optimization of the shaft system in engineering, and avoids the resonance caused by the excitation source such as rotational frequency, thereby ensuring the safe and stable operation of the HGU.

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Effect of the Supports’ Positions on the Vibration Characteristics of a Flexible Rotor Shafting

Cited by 2 publications

References 9 publications

Study of the Effect of Static Eccentricity on Vibration Damping Properties of Squeeze Film Dampers Considering the Two-Phase Flow Case

Study of the Effect of Static Eccentricity on Vibration Damping Properties of Squeeze Film Dampers Considering the Two-Phase Flow Case

A Predictive Analysis Method of Shafting Vibration for the Hydraulic-Turbine Generator Unit

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