Study on Dynamic Lubrication Characteristics of the External Return Spherical Bearing Pair under Full Working Conditions

Deng, Hongbin; Zhu, Pengkun; Hu, Cong; He, Tao

doi:10.3390/machines10020107

Cited by 6 publications

(6 citation statements)

References 18 publications

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“…In the modern mechanics of deformable solids, modelling the behaviour of machines, technical systems, processes, and phenomena requires the various coupling mechanisms of subsystems (the elements) of the object under study [1][2][3] to be considered. Such elements most commonly refer to friction or friction mechanical systems [2] that operate within the framework of contact interaction mechanics, including bearings [4,5], sliding supports [6,7], gears, or chain gears [8][9][10]. The foundations of contact interaction mechanics were laid at the end of the XIX century by Heinrich Hertz and were widely developed in the works of Russian and foreign scientists (such as Alexandrov V.M., Goryacheva I.G., Johnson K., and Kendal K.).…”

Section: Problem Context and Descriptionmentioning

confidence: 99%

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Influence Analysis of Lubricant Recesses on the Working Capacity of the Bridge Span Spherical Bearing

Nosov

Kamenskikh

2022

Lubricants

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The load on transport and logistics systems is increasing every year. This is due to car park growth around the world. Thus, increasing bridge structure durability is an urgent task for bridge-building companies. This study analyses the contact deformation of spherical bearing elements through an anti-friction polymer layer with different geometrical configurations of recesses for the lubricant, i.e., annular grooves and spherical holes. The material of the anti-friction layer (a modified polytetrafluoroethylene (PTFE)) is modelled within the framework of the deformation theory of plasticity. The procedure of automating the numerical model construction depends on the input parameters, including the thickness of the layer, the basic geometrical parameters of the recesses for the lubricant, and the distance between the rows of recesses, etc. The influence of the arrangement of filling sliding anti-friction layers on recesses for lubricants in the form of spherical holes on the contact deformation behaviour of bridge bearings has been considered. The reduction of lubricant volume in the sliding anti-friction layer with the geometry of recesses in the form of spherical holes ranges from 26 to 48.4%, depending on the filling scheme, has been found. In this case, structures with lubrication recesses in the form of spherical holes have several advantages, including a more uniform distribution of contact parameters in the interface areas of the steel plates with the anti-friction layer, reduction of the maximum level of the plastic deformation intensity, displacements along the normal relative to the free end of the sliding layer, and the settlement of the bearing.

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Section: Problem Context and Descriptionmentioning

confidence: 99%

“…The modelling of contact interactions in the subsystems of real mechanisms, machines, equipment, and technological complexes [2,4,6,8,[16][17][18].…”

mentioning

confidence: 99%

Influence Analysis of Lubricant Recesses on the Working Capacity of the Bridge Span Spherical Bearing

Nosov

Kamenskikh

2022

Lubricants

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“…Lyu et al [27] proposed a method to reduce the harmonic amplitude of specific order flow pulsation by using piston non-uniform distribution. Deng et al [28] established a kinematic model, a piston chamber pressure model, a dynamic model, and an external return spherical bearing pair lubrication model for the double-row axial piston pump, and studied the kinematic characteristics of the piston pump and the lubrication characteristics of external return mechanism under multiple working conditions. The research results of many scholars above show that the numerical simulation method has the characteristics of high efficiency and low cost in analyzing the dynamic characteristics of the axial piston pump compared with the experimental test, so the numerical simulation is a more efficient analysis method.…”

Section: Introductionmentioning

confidence: 99%

Control and Dynamic Characteristics Analysis for the Double-Compound Axial Piston Pump Based on Working Conditions

et al. 2022

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The periodic flow and pressure pulsation of the axial piston pump can lead to periodic vibration, noise, and even damage to various components in the hydraulic system. Therefore, the dynamic characteristics analysis of the axial piston pump in the hydraulic system is of great significance for reducing vibration and noise in the hydraulic system and improving efficiency. The double-compound axial piston pump is the key component of a high power and large flow hydraulic power system, which has a special power control mode. In this paper, the working and control principles of the double-compound axial piston pump are analyzed, the numerical model of the double-compound axial piston pump is established, and the effectiveness of the model is verified through experimental tests. The constant power control characteristics of the double-compound axial piston pump under different power settings and the variable power control characteristics under the rated load pressure are analyzed. By analyzing the dynamic characteristics of the double-compound axial piston pump, the influence of different working conditions on the dynamic characteristics is investigated. The results show that the output efficiency of the double-compound axial piston pump is higher when the output flow is larger. When the piston chamber works in the closed pre-compression pressure zone and the closed pre-release pressure zone, oil backflow occurs. The oil backflow in the piston chamber seriously intensifies the outlet flow pulsation of the double-compound axial piston pump. The flow pulsation rate is positively correlated with load pressure and power control pilot pressure, while negatively correlated with spindle speed. The paper provides a basis for the analysis and optimization of power control, flow pulsation, fluid vibration, and noise of the double-compound axial piston pump.

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“…Various tribological aspects of water-lubricated rubber bearings such as (a) lubrication mechanisms [10] (b) lubrication regimes transition [11][12][13] (c) optimum design of journal bearing [14,15] (d) dynamic characteristics [16] (e) turbulence and misalignment effect [17,18] (f) local wear [19], have been explored by researchers on both numerical and experimental levels [7][8][9][10][11][12][13][14][15][16][17][18][19]. An emphasis is provided on the literature related to mixed-EHL analysis of WLSTB considering different surface topography of bushing liner and journal surfaces.…”

Section: Introductionmentioning

confidence: 99%

Surface topography effect on tribological performance of water-lubricated journal bearing under mixed-EHL regime

Prajapati¹,

Ramkumar²

2022

Surf. Topogr.: Metrol. Prop.

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Water-lubricated journal bearings (WLJB) are one of the important components of the stern tube shaft. Surface topography of WLJB is an important aspect in the design of stern tube shaft, and significantly affects the lubrication characteristics of WLJB. This work aims to investigate the effect of non-Gaussian surface topography on tribological performance of water-lubricated journal bearing (WLJB) under mixed-elastohydrodynamic lubrication (mixed-EHL) regime. The non-Gaussian flow factors, and a normalized Weibull probability density function is used to tackle the non-Gaussian roughness in hydrodynamic and asperity contact models respectively. From results, it is observed that skewness (Ssk) significantly affects both asperity contact pressure and hydrodynamic pressure along circumferential direction of bearing. It is concluded that for skewness, Ssk = -1 to 1, lambda ratio falls between 1 to 3. The relation between altitude angle and skewness is established. The effect of bearing length to diameter (L/D) ratio on lubrication performance of WLJB is also discussed in detail.

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Study on Dynamic Lubrication Characteristics of the External Return Spherical Bearing Pair under Full Working Conditions

Cited by 6 publications

References 18 publications

Influence Analysis of Lubricant Recesses on the Working Capacity of the Bridge Span Spherical Bearing

Influence Analysis of Lubricant Recesses on the Working Capacity of the Bridge Span Spherical Bearing

Control and Dynamic Characteristics Analysis for the Double-Compound Axial Piston Pump Based on Working Conditions

Surface topography effect on tribological performance of water-lubricated journal bearing under mixed-EHL regime

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