Effects of Surface Waviness on the Nonlinear Vibration of Gas Lubricated Bearing‐Rotor System

Li, Jian; Sheng, Yang; Li, Xiaoming; Li, Qing

doi:10.1155/2018/8269384

Cited by 10 publications

(8 citation statements)

References 29 publications

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“…We integrate the oil film pressure p twice along the bearing surface to obtain the nonlinear oil film forces. 30 Moreover, we consider the influence of the pitch motion, as the rotor is tilted in the bearings, the oil film forces in the bearings are different. In the positive direction of the z 1 axis, the nonlinear oil film forces are as follows:where…”

Section: Mathematical Modelmentioning

confidence: 99%

Nonlinear dynamic characteristics of marine rotor-bearing system under coupled heave and pitch ship motions

Zhang

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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The coupled heave and pitch motions of a ship sailing in head waves affect the stability of the marine rotor-bearing system. Based on the theory of analytical mechanics, this study establishes a dynamic model of the rotor-bearing system subjected to the coupled motions of heave and pitch, considering nonlinear oil film moments produced by the tilting of the rotor in the bearings. The nonlinear dynamic behaviours of the system are analysed using numerical methods to obtain Poincaré sections, bifurcation diagrams, and the largest Lyapunov exponents. The results show that dynamic bifurcation characteristics reveal complex quasi-periodic motion of upper and lower branches after the initial instability of the system, and the speed of second instability increase markedly. At high speeds, the amplitude of the rotor system increases sharply, which can cause the rotor to touch the inner wall of the bearings in the quasi-periodic state and a failure to transition to the chaotic state. Additionally, the effects of heave and pitch amplitude variations on the dynamic characteristics of the system are also discussed.

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Section: Mathematical Modelmentioning

confidence: 99%

Nonlinear dynamic characteristics of marine rotor-bearing system under coupled heave and pitch ship motions

Zhang

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…How to establish an accurate prediction model of acoustic meta-material performance is a difficult point in the design of acoustic meta-material. At present, scholars such as Li et al [19] have conducted relevant research on the problem of underwater radiation noise in the low-frequency domain of JC using a standard numerical calculation method based on the acoustic solid coupling dynamic equation. The study found that compared to the fluid solid coupling, the acoustic solid coupling mode has the advantages of low modeling difficulty and high model accuracy, making it the preferred algorithm for the numerical calculation of JC underwater acoustic radiation prediction.…”

Section: Introductionmentioning

confidence: 99%

Acoustic properties of underwater acoustic metamaterials based on multi-physical field coupling model

Dong,

Lv,

Wang

et al. 2024

J. Phys.: Conf. Ser.

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In this paper, according to the internal structure of underwater acoustic metamaterial, a multi-physical field coupling model of underwater acoustic metamaterial is established by using finite element analysis. Based on the model, the influence of typical underwater acoustic metamaterial structure and material parameters on sound absorption performance is studied. The results show that increasing the height or radius of the local resonance mass unit in the metamaterial is beneficial to improve the low frequency sound absorption performance. With the increase of the distance between mass elements and the thickness of elastic material, the acoustic absorption performance increases first and then decreases. Increasing the elastic modulus of elastic material of the local resonance unit or matrix will lead to the decrease of low frequency sound absorption performance of the material and the improvement of high frequency sound absorption performance. Increasing the loss factor of elastic material of the local resonance unit or matrix material can broaden the sound absorption band. These rules can provide guidance for the design of underwater acoustic metamaterials.

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“…Rasheed 4 presented the influences of the circumferential, axial, and combined surface waviness on the journal bearing performance. Li et al 5 and Wang et al 6,7 investigated the effect of waviness on the nonlinear dynamic performance of aerostatic journal bearings and gas lubricated bearing-rotor system in the circumferential and axial directions. They concluded that the wave amplitudes can significantly change the load distribution and dynamics of the bearings.…”

Section: Introductionmentioning

confidence: 99%

“…In those waviness models, the waviness forms were established by the sinusoidal function. 5–9 Moreover, Ono and Takahasi, 10 Shelly and Ettles, 11 and Tønder 12 also contributed to the bearing surface waviness modeling and its effects on the bearing load capacity and vibrations. The waviness could change the contact condition of the bearing and lead to abnormal vibrations.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of a planetary needle roller bearing considering the waviness

Shi

Liu

Xiao

2022

Proceedings of the Institution of Mechanical Engineers, Part K:

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A dynamic model of a planetary needle roller bearing (PNRB) considering the waviness is proposed. This model can formulate the PNRB dynamic motions under high centrifugal acceleration conditions, which are more complicated than those of shaft-fixed bearings. The waviness distributed on the surfaces of races and needle rollers can change the contact conditions between the needle rollers and races. In this study, the effect of the waviness on the roller-race contact forces, roller-cage impact forces, and the PNRB elements’ dynamics are discussed, which were not studied in the listed literature for the PNRB models. Moreover, a case of a PNRB in a single row planetary gear train is used to analyze the relationship between the needle roller-cage impact force and cage speed variation. The effect of the waviness on the vibration characteristics frequency of PNRB races are also studied.

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Effects of Surface Waviness on the Nonlinear Vibration of Gas Lubricated Bearing‐Rotor System

Cited by 10 publications

References 29 publications

Nonlinear dynamic characteristics of marine rotor-bearing system under coupled heave and pitch ship motions

Nonlinear dynamic characteristics of marine rotor-bearing system under coupled heave and pitch ship motions

Acoustic properties of underwater acoustic metamaterials based on multi-physical field coupling model

Dynamics of a planetary needle roller bearing considering the waviness

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