Tribological and Vibration Properties of Three Different Polymer Materials for Water-Lubricated Bearings

Wu, Ke; Zhou, Guangwu; Mi, Xiongwei; Zhong, Ping; Wang, Wenbo; Liao, Daxin

doi:10.3390/ma13143154

Cited by 20 publications

(5 citation statements)

References 40 publications

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“…Considering Eqs. (19) and (20), the force by each individual pad can be calculated with using Eq. 7obtained from previous section.…”

Section: Assembly Proceduresmentioning

confidence: 99%

“…In spite of this paper doesn't include the effect of elastic deformation of bearing surface in terms of elastohydrodynamic lubrication, the results are valid approximately for polymer bearings with higher hardness and lower pressure that most pump and turbine guide bearings are the case. The result is not suitable to water lubricated bearings with rubber staves that needs special treatment either through experiment [20][21][22][23][24][25][26][27][28][29] or numerical analysis. Experimental study on bearings with multiple axial grooves demonstrates that a relatively rigid surface of bearing pad more easily forms hydrodynamic pressure than soft surface [22].…”

Section: Introductionmentioning

confidence: 98%

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A New Method to Calculate Water Film Stiffness and Damping for Water Lubricated Bearing with Multiple Axial Grooves

Ren¹

2020

Chin. J. Mech. Eng.

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Water lubricated guide bearings for hydro turbines and pumps are conventionally designed with multiple axial grooves to provide effectively cooling and flushing away abrasives. Due to the variety of groove configuration in terms of number and size, a predication of their performance is difficult. This paper deals with an analytical procedure to investigate groove effect on load capacity, stiffness and damping for this type of bearing where it is considered as an assembly of many inclined slide bearings. The result can be applied to bearings made of hard materials combined with low bearing pressure.

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“…Considering Eqs. (19) and (20), the force by each individual pad can be calculated with using Eq. 7obtained from previous section.…”

Section: Assembly Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

A New Method to Calculate Water Film Stiffness and Damping for Water Lubricated Bearing with Multiple Axial Grooves

Ren¹

2020

Chin. J. Mech. Eng.

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“…However, because the lubricating water has low viscosity and poor load capacity, the bearing and shaft often operate in a mixed-lubrication state, resulting in rapid wear [4][5][6] of the bearing. The friction behavior under water-lubrication conditions has attracted great interest [7][8][9][10] from many scholars. Jia et al [11] investigated the friction properties between PI-based composites and stainless steel using a block-on-ring test rig.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Scratches on the Tribological Performance of Friction Pairs Made of Different Materials under Water-Lubrication Conditions

Liang,

Guo

et al. 2023

Lubricants

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Water-lubricated bearings are widely used in marine equipment, and the lubricating water often contains hard particles. Once these particles enter the gap between the bearing and the shaft, they can scratch the smooth surfaces of the shaft and bearing, influencing the working performance of the bearing system. To investigate the effect of scratch parameters on tribological performance, this paper conducts multiple block-on-ring experiments and constructs a mixed-lubrication model under water-lubrication conditions. The results show that among the three commonly used bearing materials, the tribological performance of graphite block is the most sensitive to scratches on the test ring surface. Under the condition of one scratch (N = 1), the loading area of water film pressure is divided into two separate zones (a trapezoidal pressure zone and an extremely low-pressure zone). In addition, the variation of maximum water film pressure is determined by the positive effect (hydrodynamic pressure effect of fluid) and negative effect (“piercing effect” of the asperities). Compared with the scratch depth and scratch location, the scratch width has the most significant effect on the tribological performance of the block-on-ring system. The maximum contact pressure is located at both edges of the scratch due to the formation of a water sac structure. The scratch has a great influence on the transition of the lubrication state of the block-on-ring system. The existence of scratches increases the critical speed at which the lubrication state transits from mixed-lubrication to elastohydrodynamic lubrication, and the critical speed is directly proportional to the scratch width.

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“…Moreover, polymer-based water-lubricated bearings are prone to surface deformations at a low velocity and heavy load conditions, which causes vibrations and fluctuations during operation [ 13 , 14 , 15 , 16 ]. Several methods were used to reduce the surface deformation of polymers.…”

Section: Introductionmentioning

confidence: 99%

The Reduction in the Deformation of HDPE Composites Using Self-Lubricating Fillers in an Aqueous Environment

Liu

Dong

et al. 2022

Polymers

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Reducing the deformation of polymer matrix materials can decrease the fluctuation of coefficient of friction (COF), and friction-induced vibration and its amplitudes. HDPE composites with T-ZnOw as a fixed strengthening filler were modified with the addition of Si3N4 particles at different concentrations. The COFs, wear rates, micro-morphologies, and friction-induced vibrations were obtained by conducting sliding tests against carbon steel balls in an aqueous environment at a low velocity and high load. The mechanism of the reduction in frictional fluctuation due to the addition of Si3N4 particles was revealed through the frictional responses. The results demonstrated that 4 wt% addition of Si3N4 in HDPE can enhance the strain–stress property and improve the lubrication by forming a lubricating film. Therefore, the surface deformation and the fluctuations of COFs and its vibrations were reduced. The aggregation phenomenon and reduced strain–stress response at a high concentration of Si3N4 disrupted the positive fluctuating reduction, and resulted in a rough surface with severe tearing and cracking deformations. Additionally, it led to fluctuating wear behaviors with high COF and vibrations. The results obtained in this study can elucidate the effects of adding Si3N4 particles to enhance lubrication in polymer composites. Additionally, the results provide a new research method for designing and manufacturing polymer-based composites with low friction-induced fluctuations.

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Tribological and Vibration Properties of Three Different Polymer Materials for Water-Lubricated Bearings

Cited by 20 publications

References 40 publications

A New Method to Calculate Water Film Stiffness and Damping for Water Lubricated Bearing with Multiple Axial Grooves

A New Method to Calculate Water Film Stiffness and Damping for Water Lubricated Bearing with Multiple Axial Grooves

The Influence of Scratches on the Tribological Performance of Friction Pairs Made of Different Materials under Water-Lubrication Conditions

The Reduction in the Deformation of HDPE Composites Using Self-Lubricating Fillers in an Aqueous Environment

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