A simpler method to calculate instability threshold speed of hydrodynamic journal bearings

Huang, Yu; Tian, Zhuxin; Chen, Runchang; Cao, Huai

doi:10.1016/j.mechmachtheory.2016.11.009

Cited by 18 publications

(16 citation statements)

References 12 publications

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“…If there is no lubricant in the mechanical joints, direct collisions take place in the mechanical systems causing vibration and fatigue phenomena [22,25,[52][53][54][55][56][57][58]. In some applications, the joints are designed to run with some fluid lubricant, with the purpose of reducing friction, wear and to provide load capacity to keep the joint elements apart [9,44,[59][60][61][62][63][64][65][66].…”

Section: Introductionmentioning

confidence: 99%

A comprehensive survey of the analytical, numerical and experimental methodologies for dynamics of multibody mechanical systems with clearance or imperfect joints

Tian

Flores

Lankarani

2018

Mechanism and Machine Theory

316

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A comprehensive survey of the literature of the most relevant analytical, numerical, and experimental approaches for the kinematic and dynamic analyses of multibody mechanical systems with clearance joints is presented in this review. Both dry and lubricated clearance joints are addressed here, and an effort is made to include a large number of research works in this particular field, which have been published since the 1960's. First, the most frequently utilized methods for modeling planar and spatial multibody mechanical systems with clearance joints are analyzed, and compared. Other important phenomena commonly associated with clearance joint models, such as wear, non-smooth behavior, optimization and control, chaos, and uncertainty and links' flexibility, are then discussed. The main assumptions procedures and conclusions for the different methodologies are also examined and compared. Finally, future developments and new applications of clearance joint modeling and analysis are highlighted.

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Section: Introductionmentioning

confidence: 99%

A comprehensive survey of the analytical, numerical and experimental methodologies for dynamics of multibody mechanical systems with clearance or imperfect joints

Tian

Flores

Lankarani

2018

Mechanism and Machine Theory

316

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“…When the short-bearing approximate is applied with half-Sommerfeld boundary conditions, the nondimensional oil film forces of the bearing are as follows [6,13].…”

Section: Verification and Discussionmentioning

confidence: 99%

“…Khonsari and Chang [5] analyzed the nonlinear stability of journal bearings, and obtained the stability boundary by tracking the journal center trajectory. To easily derive the linear threshold speed, Huang et al [6] chose polar coordinates instead of Cartesian coordinates to signify the state vector. Lin et al [7,8] discussed the threshold speed and stability boundary of hydrodynamic journal bearings lubricated using non-Newtonian fluids.…”

Section: Introductionmentioning

confidence: 99%

Transformation between polar and rectangular coordinates of stiffness and dampness parameters in hydrodynamic journal bearings

Tian

Huang

2020

Friction

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The stiffness and dampness parameters of journal bearings are required in rectangular coordinates for analyzing the stability boundary and threshold speed of oil film bearings. On solving the Reynolds equation, the oil film force is always obtained in polar coordinates; thus, the stiffness and dampness parameters can be easily obtained in polar coordinates. Therefore, the transformation between the polar and rectangular coordinates of journal bearing stiffness and dampness parameters is discussed in this study.

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“…The solution is presented as general formula for an arbitrary n-th section of the bar, which is called an universal formula. We consider that with support sections V i downward positive motion, the reaction of the i-th elastic support R i is directed upwards and is equal to [5]:…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, the uninterrupted and reliable shaft line operation is an actual problem nowadays. It can be proved by the large number of publications worldwide [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Analysis of boundary conditions in design circuits influence on the shaft line operating state

Khalyavkin¹,

Makeev

Salamekh³

et al. 2020

E3S Web Conf.

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The work investigates the bearing piece boundary conditions influence on the shaft line operating state, with respect to elastic properties of stern-tube bearings. It is noted that the shaft line is a part of the ship’s power plant and it is a shaft system, located on the same axis. Performance criterion is the deflection of the concentrated load in the design scheme`s action point, modeling the propeller`s weight, bearing parts reactions and the natural frequency of linear lateral oscillations. The design scheme itself is a beam, resting on two elastic supports with a k stiffness factor, with concentrated load acting on the one end and three variants of the boundary conditions: pinched, hinged and sliding supports on another one. The results of calculations are given for different boundary conditions and the stiffness factors of elastic supports. The diagram of natural frequencies of linear lateral oscillations of ship`s shafting line is presented.

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A simpler method to calculate instability threshold speed of hydrodynamic journal bearings

Cited by 18 publications

References 12 publications

A comprehensive survey of the analytical, numerical and experimental methodologies for dynamics of multibody mechanical systems with clearance or imperfect joints

A comprehensive survey of the analytical, numerical and experimental methodologies for dynamics of multibody mechanical systems with clearance or imperfect joints

Transformation between polar and rectangular coordinates of stiffness and dampness parameters in hydrodynamic journal bearings

Analysis of boundary conditions in design circuits influence on the shaft line operating state

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