Статті в журналах: "Water-lubricated bearing"

1

Wang, You Qiang, and Li Jing Zhang. "Characteristics and Outline of Water-Lubricated Thordon Bearing." Advanced Materials Research 496 (March 2012): 355–58. http://dx.doi.org/10.4028/www.scientific.net/amr.496.355.

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Thordon is a new liner material used widely in water-lubricated bearings in virtue of its shockproof characteristic, high load and wear resistance. The category of materials used in water-lubricated bearings was briefly outlined and tribological characteristics of most of the materials were compared in the paper. The defects of the traditional water-lubricated bearing materials were listed and the advantage of the Thordon bearing was presented. The development status and the tribological characteristics of the water-lubricated Thordon bearings were studied. The application prospects of the water-lubricated Thordon bearings were introduced in the end of the paper.

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2

Zhang, Xia, Xin Rong Wang, Xiao Hai Li, and Xuhong Chu. "Study on Influence Factors of Bearing Capacity of Water-Lubricated Thrust Bearing and its Improving Methods." Advanced Materials Research 479-481 (February 2012): 949–52. http://dx.doi.org/10.4028/www.scientific.net/amr.479-481.949.

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Water is a kind of low viscosity liquid and the bearing capacity of water lubrication bearings is very low. The influence factors of bearing capacity of water-lubricated thrust bearing and its improving methods are studied. First, bearing capacity characteristic of water-lubricated bearings is expounded. Secondly, the main factors of affecting bearing capacity are analyzed. At last, by combining the master pump motor running condition, the bearing capacity is improved by changing many factors including the material and hardness matching of friction pair, the roughness of grinding area, bearing structure, fan-shaped bushes number, pivot location, confined area of bearing, speed and the medium temperature, etc. The study provides a theory basis for improving bearing capacity of water-lubricated bearings.

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3

Zhang, Xiu Li, Zhong Wei Yin, Dan Jiang, and Geng Yuan Gao. "Comparison of the Lubrication Performances of Water-Lubricated and Oil-Lubricated Plain Journal Bearings." Applied Mechanics and Materials 711 (December 2014): 27–30. http://dx.doi.org/10.4028/www.scientific.net/amm.711.27.

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Water-lubricated bearings have attracted increasing attention in recent years because of their environmental sustainability, simplified design, low cost, good cooling performance and low coefficient of friction. To show the characteristic of water lubrication more clearly, this paper quantitatively compares the lubrication performances of water-lubrication plain journal bearing and oil-lubricated plain journal bearing using CFD method. Bearing length, friction coefficients, power losses and temperature rises are obtained under the same working condition. Results show that water-lubricated bearing needs to be 3.4 times longer than oil-lubricated bearing, but its friction coefficient and power loss are only 11.7% of those of oil-lubricated bearing and its maximum temperature rise is less than 2 K, much lower than 96.76 K corresponding to oil lubrication.

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4

Litwin, Wojciech. "Influence of main design parameters of ship propeller shaft water-lubricated bearings on their properties." Polish Maritime Research 17, no. 4 (January 1, 2010): 39–45. http://dx.doi.org/10.2478/v10012-010-0034-z.

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Influence of main design parameters of ship propeller shaft water-lubricated bearings on their properties In recent years more and more frequently can be met ships in which propeller shaft water-lubricated polymer bearings have been applied. It results from their simplicity and associated relatively low initial and operational cost as compared with the complex classical sealed system based on oil-lubricated bearings. It is worth mentioning that the water-lubricated bearings are also environmentally friendly as no risk of pollution with lubricating oil used in classical systems, is involved. Design procedure of bearings in question based on materials made available by producers is relatively simple. However it turns out that choice of an appropriate sliding material, clearance value and optimum arrangement of lubricating grooves may greatly influence bearing's properties. As results from the performed research investigations, bearing of the kind is a highly sensitive unit. Problems of choosing a suitable bearing clearance, designing an optimum bush geometry, selecting a proper bush material are crucial for life time of the bearing. In particular the problem is in forming hydrodynamical properties of bearing as owing to its operation in the fluid friction regime durability of bearings, the very responsible units of propulsion transmission system, can be greatly extended.

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5

Peng, Jin Min, and Jiang Bo Yu. "Water Lubricated Mechanism Based on Multilevel Method." Applied Mechanics and Materials 148-149 (December 2011): 1388–93. http://dx.doi.org/10.4028/www.scientific.net/amm.148-149.1388.

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This paper presents the multilevel method basic theory and its material progress which is used in water lubricated plastic alloy bearing’s elastohydrodynamic lubrication(EHL) numerical calculation. On base of liner contact theory, the results of water lubricated plastic alloy bearing’s EHL numerical calculation model are gained to describe dimensionless pressure and water thickness curves. It discloses the lubrication mechanism of the water lubricated plastic alloy bearing’s EHL. The cuneiform water film of frictional surface between bearing and spindle is come into being because the plastic alloy has high elasticity and lower Young’s modulus which lead the water lubricated bearing is easy to be distorted

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6

Ouyang, Wu, Xuebing Zhang, Yong Jin, and Xiaoyang Yuan. "Experimental Study on the Dynamic Performance of Water-Lubricated Rubber Bearings with Local Contact." Shock and Vibration 2018 (2018): 1–10. http://dx.doi.org/10.1155/2018/6309727.

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Accurate dynamic characteristic coefficients of water-lubricated rubber bearings are necessary to research vibration of ship propulsion system. Due to mixed lubrication state of water-lubricated rubber bearings, normal test rig and identification method are not applicable. This paper establishes a test rig to simulate shaft misalignment and proposes an identification method for water-lubricated rubber bearings, which utilizes rotor unbalanced motion to produce self-excited force rather than artificial excitation. Dynamic performance tests under different conditions are operated. The results show that when rotational speed is less than 700 r/min, even if specific pressure is 0.05 MPa, it is difficult to form complete water film for the rubber bearing which was investigated, and contact friction and collision of the shaft and bearing are frequent. In the mixed lubrication, water film, rubber, and contact jointly determine dynamic characteristics of water-lubricated rubber bearings. The contact condition has a significant effect on the bearing stiffness, and water film friction damping has a significant effect on bearing damping. As for the particular investigated bearing, when rotational speed is in the range of 400~700 r/min and specific pressure is in the range of 0.03~0.07 MPa, bearing stiffness is in the range of 5.6~10.06 N/μm and bearing damping is in the range of 1.25~2.02 Ns/μm.

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7

Gao, Geng Yuan, Zhong Wei Yin, Dan Jiang, and Xiu Li Zhang. "Researches on Friction Performance of Water-Lubricated Polymer Composite Journal Bearings Based on Experiments." Applied Mechanics and Materials 711 (December 2014): 57–60. http://dx.doi.org/10.4028/www.scientific.net/amm.711.57.

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A composite which is PTFE as a matrix with PEEK and carbon fiber as fillers is developed to fabricate the bush of water-lubricated journal bearings. The bush is fabricated with a new structure that a relatively large straight groove is opened in its upper part. A water-lubricated journal bearing made up of the bush and a steel sleeve is studied using purposed-built test rig. It is shown that the test bearing operates under hydrodynamic lubrication for almost all of the given conditions. The composite developed in the work is a promising material for water-lubricated journal bearings, and the new structure can be well used in water-lubricated journal bearings.

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8

Wu, Kepeng, Guangwu Zhou, Xiongwei Mi, Ping Zhong, Wenbo Wang, and Daxin Liao. "Tribological and Vibration Properties of Three Different Polymer Materials for Water-Lubricated Bearings." Materials 13, no. 14 (July 15, 2020): 3154. http://dx.doi.org/10.3390/ma13143154.

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Water-lubricated bearings usually operate under severe environmental conditions, most likely in the mixed regime, in which surface contact between the drive shaft and the bearing sleeve is often significant. This presents great challenges to bearing design, especially material selection. The Tenmat, Thordon, and Rubber are common water-lubricated bearing composites. In this paper, by using a block-on-ring test apparatus, the Stribeck curve, wear rate, and vibration characteristics of three kinds of polymer materials in water-lubricated bearings (Tenmat, Thordon SXL, and Ben Teng Group (BTG) Rubber) under low speed and heavy load were studied. The experimental results show that, under the same working conditions, BTG rubber has excellent tribological properties and vibration properties. The research method in this paper can provide references for the selection of materials used for friction pair, improvement of working performance and vibration reduction of water-lubricated bearings in the future.

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9

Wang, Xin Rong, Xiao Hai Li, Ya Chao Cui, and Li Hua Yang. "Design of Main Pump Motor’s Water Lubricated Bearing and Research on its Lubrication Performances." Advanced Materials Research 538-541 (June 2012): 1971–74. http://dx.doi.org/10.4028/www.scientific.net/amr.538-541.1971.

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Water-lubricated thrust bearing is a key component of certain main pump motor. In this paper, the right structure of water-lubricated thrust graphite bearings is designed based on low viscosity hydrodynamic lubrication theory by combining the bearings running working condition, and the frictional accessory material is also determined by theoretical analysis and test. The factors influencing lubrication performances of water-lubricated thrust bearings are analyzed; the methods improving lubrication performances are put forward to guarantee that water-lubricated thrust graphite bearings have the good lubrication performances, good carrying capacity and longer work life.

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10

Chen, Pingwei, Tong Wang, Wensheng Ma, Jie Chen, and Rui Cao. "Rotordynamic characteristic of water lubricated plain journal bearing under transient load." Journal of Physics: Conference Series 2280, no. 1 (June 1, 2022): 012046. http://dx.doi.org/10.1088/1742-6596/2280/1/012046.

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Abstract Transient startup operating parameter has a serious influence on the stability of water-lubricated bearings. In this study, CFD method was used to predict the rotordynamic coefficients of water lubricated bearings under transient loads. The stiffness and damping coefficients versus transient time for water-lubricated bearings are given. The stiffness and damping coefficients versus different transient loads for water-lubricated bearings are also given. The results show that the stiffness and damping coefficients will increase rapidly in a very short time. With the increase of impact time, both of them come to a steady value. With the increase of impact load, the direct stiffness and the direct damping coefficients of water lubricated bearing will increase. The value of cross-coupling stiffness and the cross-coupling damping coefficients will decrease.

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11

Gengyuan, Gao, Yin Zhongwei, Jiang Dan, and Zhang Xiuli. "CFD analysis of load-carrying capacity of hydrodynamic lubrication on a water-lubricated journal bearing." Industrial Lubrication and Tribology 67, no. 1 (February 9, 2015): 30–37. http://dx.doi.org/10.1108/ilt-03-2013-0028.

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Purpose – The purpose of this paper is to improve hydrodynamic load-carrying capacity of a water-lubricated journal bearing by a new bush structure. Water-lubricated bearing is becoming more and more popular since it is environmentally friendly and saves energy. However, contrary to oil and grease-lubricated bearings, water-lubricated bearing is limited in many situations due to its low hydrodynamic load-carrying capacity. Design/methodology/approach – The present article proposes a new bearing bush, with a transition-arc structure, which is favorable for increasing hydrodynamic load-carrying capacity. Hydrodynamic load-carrying capacity was calculated by means of three-dimensional computational fluid dynamics (3-D CFD) analysis. Several variants of a journal bearing with a transition-arc structure of different dimensions are analyzed, while the radial clearance of the bearing, eccentricity ratio and the velocity of the journal remain unchanged. Findings – The results show that obvious changes are found in hydrodynamic load-carrying capacity of a water-lubricated journal bearing. For different width over diameter (L/D) bearing ratios, the relationship between hydrodynamic load-carrying capacity and the magnitude of the transition-arc structure dimension is researched. Originality/value – The research presented here leads to a design reference guideline that could be used by the designer engineer to design smart journal bearings for improving the hydrodynamic load-carrying capacity.

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12

Yu, Xiao-feng, Chang-geng Shuai, Xue Yang, Gang Lu, Ce Liang, and Zhuo Liu. "Design and testing of a smart rubber stave for marine water-lubricated bearings." Science and Engineering of Composite Materials 29, no. 1 (January 1, 2022): 215–26. http://dx.doi.org/10.1515/secm-2022-0022.

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Abstract The water-lubricated bearing is mainly installed at the stern of the ship to support the rotation of the main shaft of the ship, which is an important component of the ship’s power plant. The rubber stave of the water-lubricated bearing acts as an elastic body, which can effectively suppress the rotational vibration of the rotating shaft and improve the shaft alignment effect. To monitor the operational status of the water-lubricated bearing at the stern of a ship, a design method of smart rubber stave for water-lubricated bearings is proposed in this article. According to the structure of the rubber stave, the packaging and protection form of the optical fiber, the forming process of the rubber stave, and the mechanical analysis were carried out to determine the distribution design principle of the fiber Bragg grating (FBG) in the rubber stave. Then, FBGs were packaged, protected, and implanted with an uneven distribution into the rubber stave to achieve force sensing in the bearing. With reference to the force state of the water-lubricated bearing during shipbuilding and ship operation, various types of condition monitoring tests were conducted on the smart rubber stave using an elastomer testing machine, which were to analyze the effects of load sizes, frequencies, and ambient temperatures. The tests showed that the FBGs in the rubber stave could monitor the static and dynamic loads of the bearing under the seawater environment or inland water environment below 30°C. This method can be used for the smart designing and online load condition monitoring of water-lubricated bearings.

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13

Shi, YF, M. Li, GH Zhu, and Y. Yu. "Dynamics of a rotor system coupled with water-lubricated rubber bearings." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 23 (January 22, 2018): 4263–77. http://dx.doi.org/10.1177/0954406217750942.

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Dynamic behaviour is significantly important in the design of large rotor systems supported on water-lubricated rubber bearings. In this study, the mathematical model of elastohydrodynamic lubrication of the bearing is established based on the theory of hydrodynamic lubrication after considering the elastic deformation of rubber, and the dynamic characteristics of water-lubricated rubber bearings are analysed under small perturbation conditions according to the load increment method and the finite difference method. Next, the differential equation of rotor systems coupled with the water-lubricated rubber bearing is deduced using Lagrange’s approach, and its critical speeds, stability, and unbalanced responses are analysed in detail. The numerical results show that several parameters, such as the eccentricity, length–diameter ratio, and clearance of bearing and the rotating speed of the rotor, have a great impact on the dynamic performance of water-lubricated rubber bearings, and this influence cannot be ignored, especially in the case of large eccentricity ratios. The dynamic characteristics of rotor systems guided by water-lubricated rubber bearings reveal that the critical speeds are much lower than the ones under the rigid supports because of the elastic deformation, and they also indicate that the rotor system supported on water-lubricated rubber bearings has a weaker stability. In addition, the steady-state responses of the rotor system are analysed when the mass unbalance of the propeller exists, and the effect of the thickness of the rubber liner is also considered.

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14

Jin, Yong, and Fang Lan. "Modal Analysis of Water-Lubricated Rubber Stern Bearing Based on ANSYS." Advanced Materials Research 291-294 (July 2011): 2111–14. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.2111.

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With the popularity of the water lubricated rubber stern bearing, researches around rubber bearings are becoming more and more popular in recent years. This paper built a 3D numerical model of water-lubricated rubber stern bearing and did both free boundary and constraint modal analysis using finite element software ANSYS. The results show that free modes of water-lubricated rubber stern bearing are correlating with the constraint modes. The natural frequency distributes intensely in low frequency and the modal shapes mainly focus in the inner lining. Along with mode order increased, the mode shapes become more complicated. The mode shapes mainly embodies in the inner lining.

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15

Lv, Fangrui, Chunxiao Jiao, Qian Jia, and Kang Xia. "Influence of Structural and Operating Parameters on Lubrication Performance of Water-Lubricated Polymer Bearing with Journal Misalignment." Lubricants 10, no. 12 (November 28, 2022): 336. http://dx.doi.org/10.3390/lubricants10120336.

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Marine water-lubricated polymer bearings support the propeller shaft that stretches out of the ship. The bending deformation of propeller shaft often leads to journal misalignment, significantly impacting the bearing performance. In this paper, a mixed lubrication model for water-lubricated polymer bearing is established considering the effect of journal misalignment, liner elastic deformation, and local turbulence. The influence of key structural and operating parameters on the performance of water-lubricated bearing with journal misalignment is investigated. The results show that the journal misalignment significantly reduces the load-carrying capacity, deteriorates the bearing tribological characteristics, and may cause different axial sections of the bearing to be in different lubrication regimes. Compared with aligned bearings, increasing the length–diameter ratio to improve the load-carrying capacity is significantly weakened for misaligned bearings. Increasing the liner thickness and the load improves axial uniformity of pressure distribution of misaligned bearings. A relatively large clearance ratio decreases the load-carrying capacity and increases the friction coefficient of bearings in the mixed lubrication regime.

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16

Zhao, Zhiming, and Rui Zhang. "Theoretical and experimental analysis of a water-lubricated rubber journal bearing with a large aspect ratio." Industrial Lubrication and Tribology 72, no. 6 (March 2, 2020): 797–803. http://dx.doi.org/10.1108/ilt-10-2019-0440.

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Purpose The hydrodynamic characteristics of liquid film for bearings, especially water-lubricated bearings with a large length-to-diameter ratio, affect the dynamics behavior of rotor bearing systems. The purpose of this study is to carry out theoretical analysis and experiments to determine the hydrodynamic characteristics of water-lubricated journal bearings. Design/methodology/approach The finite difference method is adopted for the simulation of the characteristics of water-lubricated bearings. The comparison results between water-lubricated bearings with and without grooves, as well as with and without the consideration of the effects of rubber deformation, are presented. The test bearings, test bench, and monitoring system, especially the force exciter for the bearing experiment, are presented. Dynamic coefficient identification verification experiments were performed in different working situations. The obtained results include the calibration of magnetic force, two kinds of excitation, vibration data of the rotor system and dynamic coefficients. Findings The theoretical results demonstrate that the hydrodynamic effect was obvious when the speed was increased and that the water film had improved capability at a working speed of 1800 rpm. The identification results reveal the lubrication situation of the test bearing under low-speed and high-load conditions. Moreover, it was found that the liquid film was not continuous at low speeds. Originality/value The theoretical results can lead to the enhancement of the design level of water-lubricated rubber journal bearings with a large aspect ratio. The experimental results can lead to the improvement of the dynamic behavior design of rotor systems supported using water-lubricated bearings with a large length-to-diameter ratio.

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17

Wang, You-Qiang, Xiu-Jiang Shi, and Li-Jing Zhang. "Experimental and numerical study on water-lubricated rubber bearings." Industrial Lubrication and Tribology 66, no. 2 (March 4, 2014): 282–88. http://dx.doi.org/10.1108/ilt-11-2011-0098.

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Purpose – Water-lubricated rubber bearing is one of the most appropriate bearings for underwater use. The most popular design used widely today is the straight fluted rubber bearing. The special configuration leads to partial hydrodynamic lubrication and low load capacity. A new bearing bush structure with two cavities which is favorable for constructing continuous hydrodynamic lubrication was designed and studied. The paper aims to discuss these issues. Design/methodology/approach – A new bearing bush structure with two cavities which is favorable for constructing continuous hydrodynamic lubrication was designed. The apparatus for studying the tribological behaviors of the two types of water-lubricated rubber bearings has been devised and established in the paper. The experimental studies on the tribological properties of the rubber bearings have been conducted under different loads and velocities. The eccentricity ratio of the new structure rubber bearing with two cavities was measured in experiment and the load capacity was calculated by numerical simulation. Findings – The experimental results show that the friction coefficient decreases with increasing velocity; the friction coefficient increases sharply with the rising temperature, the friction coefficient increases at first and then decreases with increasing load for fluted rubber bearings. The numerical results were in good agreement with the experimental results. The numerical results show that complete hydrodynamic lubrication can be formed in the new designed rubber bearing with two cavities. The experimental and numerical results all indicate that there is an appropriate bearing clearance which the friction coefficient is minimum and the load capacity is maximum. Originality/value – A new bearing bush structure with two cavities which is beneficial to constructing continuous hydrodynamic lubrication film was designed. A new apparatus for studying the tribological behaviors of the two types of water-lubricated rubber bearings has been devised and established. Experimental and numerical study on the new structure rubber bearing were conducted in the paper.

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18

Olszewski, Artur, Michał Wodtke, and Piotr Hryniewicz. "Experimental Investigation of Prototype Water-Lubricated Compliant Foil Bearings." Key Engineering Materials 490 (September 2011): 97–105. http://dx.doi.org/10.4028/www.scientific.net/kem.490.97.

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First gas-lubricated compliant foil bearings (CFBs) were built in the 1950s. Due to their significant advantages, such as oil-free operation, good tolerance to bearing misalignment and very low maintenance, they have been penetrating the bearing applications for high speed compressors, air-cycle machines and gas turbines. The work presented here investigates a novel idea of water-lubricated compliant foil bearings, which could be used in applications where environmentally friendly lubrication is desired, for example in hydroelectric turbines or water pumps. Experimental results collected for three prototype water-lubricated foil journal bearings are presented. The tests were conducted under steady radial load and with the sliding speed varied incrementally. A sequence of design improvements is presented, with the best bearing demonstrating friction coefficient of about 0.01 at the sliding speed of about 4 m/s and the radial load of about 300 kPa. Encountered difficulties, research methodology and the testing equipment are also described.

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19

Feng, Ming, and Tian Ming Ren. "Application of Water-Lubricated Bearings in Motorized Centrifugal Air Compressor for Fuel Cell Automotives." Applied Mechanics and Materials 670-671 (October 2014): 920–23. http://dx.doi.org/10.4028/www.scientific.net/amm.670-671.920.

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Proton exchange membrane (PEM) fuel cells intended for new energy automotives require a high efficiency and reliability motorized compressor to supply pressurized air. This paper presents a study and development of a motorized centrifugal air compressor using water-lubricated bearings. Comparing the performance of water-lubricated bearing with gas-lubricated bearing, we found that under the same power consumption the load capacity of water-lubricated bearings are more suitable for high speed motorized compressor system. A prototype was built and tested to verify the possibility of the developed motorized centrifugal air compressor. The results show that the system can operate at a stable rotating speed up to 80,000 rpm. The flow rate of the pressurized air is 350Kg/h and pressure ratio is 1.52 at 60,000 rpm, with a global efficiency of approximately 80%.

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20

Wu, Zhu Xin, Lin Liu Zheng, and Fa Xiao Fan. "Research on the Tribological Properties of SF Polymer Water-Lubricated Bearings." Advanced Materials Research 150-151 (October 2010): 102–7. http://dx.doi.org/10.4028/www.scientific.net/amr.150-151.102.

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In the paper, the SF polymer water lubricated bearings is taken as the research objects. Both material testing and bearing simulation testing are carried out to research the tribological properties of bearings including water swelling properties, friction coefficient, and wear-resistant properties mainly. The results show that the SF material, which is a new type of material used in water lubricated tail bearing, has the characteristics of low friction coefficient, high load capacity, good wear-resistance, excellent self-lubricating properties, and low water swelling, which has a broad application in the shipbuilding industry.

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21

Lv, Fangrui, Donglin Zou, Na Ta, and Zhu-Shi Rao. "Improvement of lubrication performance of water lubricated polymer bearing via enlarged axial end bearing diameter." Industrial Lubrication and Tribology 71, no. 4 (May 7, 2019): 564–72. http://dx.doi.org/10.1108/ilt-09-2018-0332.

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Purpose The purpose of this paper is to improve the lubrication performance of a water-lubricated polymer bearing with axial grooves, especially enlarge the minimum film thickness. Design/methodology/approach The bearing diameter is enlarged near the axial ends of the journal, with axial openings of a trumpet shape. A numerical model is developed which considers the proposed trumpet-shaped openings, bush deformation and grooves. The generatrix of the trumpet-shaped opening is assumed to be a paraboloid. Three different variations are covered, and the influences of the trumpet-shaped openings’ parameters on the bearing performance are analyzed. Findings The appropriate trumpet-shaped openings at the axial ends effectively increase the minimum film thickness, and the impact of trumpet-shaped openings on load carrying capacity is very small or even negligible. For the water-lubricated polymer bearing with axial grooves analyzed in this paper, the appropriate trumpet-shaped openings increase the minimum film thickness from 0.53 to 11.14 µm and decrease the load carrying capacity by 2.48 per cent. Practical implications The results of this study can be applied to marine propeller shaft systems and other systems with polymer bearings. Originality/value This paper has presented an approach for significantly increasing the minimum film thickness of a water-lubricated polymer bearing. A study on the performance improvement of water-lubricated polymer bearings with axial grooves is of significant interest to the research community.

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Yu, Yang, and Wei Zhao. "Study on Water-Lubricated Graphite Sliding Bearing Performance Test." Advanced Materials Research 655-657 (January 2013): 636–39. http://dx.doi.org/10.4028/www.scientific.net/amr.655-657.636.

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Water-lubricated graphite bearing has gradually obtained the widespread application, with its high wear resistance, high temperature resistance and self lubricating, This paper designed the water-lubricated graphite sliding bearing performance testing platform and studied the factors that could affect bearing friction wear rate and the vibration of bearing, such as load, speed and running time. The final results show that the water-lubricated graphite sliding bearing can basically meet the requirements of the blower shaft system.

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23

Han, Yanfeng, Lei Yin, Guo Xiang, Guangwu Zhou, Haizhou Chen, and Xiaolin Zheng. "An experimental study on the tribological performance of water-lubricated journal bearings with three different materials." Industrial Lubrication and Tribology 72, no. 10 (May 4, 2020): 1159–65. http://dx.doi.org/10.1108/ilt-10-2019-0447.

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Purpose The tribological behavior, i.e. friction coefficient and wear rate, and vibration characteristics of the water-lubricated bearing was investigated. The water-lubricated bearing is made of three different materials, i.e. polyether-ether-ketone (PEEK), polyimide (PI) and nitrile-butadiene rubber (NBR). Design/methodology/approach The tribological behavior was investigated experimentally on a specially designed test rig. Three vibration sensors were used to record the vibration of the bearing. Findings The results indicated that the variation of friction coefficient with rotation speed agrees well with the trend of Stribeck curve. The tested friction coefficient of rubber bearing is higher than that of the other two bearings whether it is in the state of mixed-lubrication or hydrodynamic lubrication, and which causing a larger wear rate in rubber bearing. The PEEK bearing exhibits the best tribological properties due to it has smaller friction coefficient and wear rate. However, it can be found that the rubber bearing gives the minimum vibration acceleration, which means that the rubber bearing has the most potential to improve the stability of water-lubricated bearing rotor system. Originality/value In this study, a group of experiment studies conducted on a specially designed test rig. The comprehensive performance, including friction coefficient, vibration acceleration and wear rate, of water-lubricated bearing with three different materials, i.e. PEEK, PI and NBR, was compared systematically. The experiment research may offer a reference for the selection of material in water-lubricated bearing in specific operating conditions. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-10-2019-0447/

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Feng, Huihui, and Shuyun Jiang. "Dynamics of a motorized spindle supported on water-lubricated bearings." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 3 (August 8, 2016): 459–72. http://dx.doi.org/10.1177/0954406215616653.

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The purpose of this paper is to investigate the dynamic performances of a motorized spindle supported on water-lubricated bearings. A modified transfer matrix method considering both of the translational and tilting dynamic coefficients of the bearings is established. The turbulent Reynolds equation is adopted and numerically solved by the perturbation method and the finite difference method, and the dynamic characteristics of the water-lubricated journal bearings are obtained; the effects of the eccentricity ratio, tilting angle, and the rotational speed on the dynamic coefficients of the water-lubricated journal bearings are analyzed. The critical speed, the dynamic stiffness of spindle nose, and unbalance response of the motorized spindle are investigated. Finally, a comparative study of rotor dynamic behaviors between the 32- and the eight-coefficient bearing models is conducted. The numerical predictions obtained by the 32-coefficient bearing models correlate well with the experimental values available in the literature.

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25

Liu, Jiao, Zheng Lin Liu, Xiang Kun Meng, and Xing Xin Liang. "Study on the Performance of Water Lubricated Stern Tube Bearing Based on Fluent." Applied Mechanics and Materials 496-500 (January 2014): 692–96. http://dx.doi.org/10.4028/www.scientific.net/amm.496-500.692.

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Apply FLUENT software to establish the water lubricated rubber stern tube bearing CFD model,study temperature and pressure distribution of the bearings at different speeds of rotation. It plays an important role in improving the performance of ship water lubricated stern tube bearing and security, reliability of propulsion system. The simulation results show that increasing the shaft speed in a certain range can reduce water film temperature, the effect is obvious especially at slow entrance velocity of bearings. Both high and low pressure ranges in the middle of bearings are enlarged with the increase of speed.

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26

Wang, Chuang, Ziwen Xing, Xi Pan, and Zhilong He. "Simulation of the characteristics of the water-lubricated journal bearing in twin-screw air compressor." Industrial Lubrication and Tribology 70, no. 8 (November 12, 2018): 1476–86. http://dx.doi.org/10.1108/ilt-05-2017-0134.

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Purpose The well-operating condition of journal bearing is the assurance to keep superior performance of water-lubricated twin-screw compressor. To design the journal bearing more reasonably for this type of compressor, this paper aims to study the effects of rotating speed and design parameters on bearing characteristics, considering surface roughness and bending deformation of the shaft at the same time. Design/methodology/approach The average Reynolds equation considering the effect of surface roughness is adopted and solved by finite difference method and successive over-relaxation method to calculate pressure distribution with real bearing shapes and boundary conditions. The bending deformation of the shaft is calculated using simply supported beam model of variable cross-section. Findings The dynamic lubrication characteristics of four water-lubricated journal bearings in twin-screw air compressor are calculated and analyzed. In addition, the static characteristics of journal bearing including friction coefficient, film thickness ratio distribution and water film pressure distribution are calculated numerically with different rotating speed and design parameters. Moreover, some design principles of water-lubricated bearing for twin-screw compressor are put forward. Originality/value The lubrication characteristics of the water-lubricated journal bearing in twin-screw air compressor are calculated considering surface roughness and bending deformation of the shaft at the same time. The paper’s results may provide design guidelines for journal bearing in this kind of twin-screw compressor.

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27

WU, XIAOJIN, JIAXU WANG, KE XIAO, and JUANJUAN ZHU. "NUMERICAL SIMULATION STUDY ON WATER-LUBRICATED RUBBER BEARING." Journal of Advanced Manufacturing Systems 07, no. 01 (June 2008): 111–14. http://dx.doi.org/10.1142/s021968670800119x.

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Water-lubricated rubber bearings are one of the most appropriate bearings for underwater use. Because of the configuration and special application environment, numerical simulation is difficult with FEM software and relevant report is rare. The water lubrication is especially interesting in terms of cost and convenience. As a result of capital cost of water-lubricated rubber bearing and time consuming experiment, the numerical approach with FEM prevails. But owning to the petty gap where lubrication fluid is bounded in, the modeling is very difficult. Three dimensional free modal and stress distribution of the bearing are analyzed in numerical simulating with FEM software. The present work of analyzing model is further worthwhile as the model can give yield results according to experiments. The modal and harmonic analyzing results can be used directly in material design and also the improvement of structure.

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28

Peng, Jin Min, and Jiang Bo Yu. "Water Lubricated Bearing Lubrication Model Based on Multilayer Gridding." Applied Mechanics and Materials 101-102 (September 2011): 623–27. http://dx.doi.org/10.4028/www.scientific.net/amm.101-102.623.

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The principle of the multilayer gridding algorithm, as well as its applications to the numerical calculation of water lubricated plastic alloy bearing elastohydrodynamic lubrication (EHL), was described. The computation of water lubricated plastic alloy bearing EHL was carried out by the numerical model based on the linear contact theory. A cuneiform water film on the frictional surface between bearing and spindle is formed because the plastic alloy has a high elasticity and low elastic modulus, which lead the water lubricated bearing easy to be distorted.

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29

Litwin, Wojciech, Artur Olszewski, and Michał Wodtke. "Influence of Shaft Misalignment on Water Lubricated Turbine Sliding Bearings with Various Bush Modules of Elasticity." Key Engineering Materials 490 (September 2011): 128–34. http://dx.doi.org/10.4028/www.scientific.net/kem.490.128.

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Hydropower industry increasingly frequently uses water lubricated bearings in turbines. This stems from the lack of negative impact of such solution on the environment. The paper presents an analysis of the influence of shaft misalignment in a turbine with water lubricated main shaft bearing on its hydrodynamic capacity. The theoretical analysis was based on the results of calculations for experimentally verified elastohydrodynamic lubrication (EHL) model. The obtained results showed impact of the stiffness of bush material and the degree of misalignment on bearing's hydrodynamic capacity.

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30

Litwin, Wojciech. "Experimental research on marine oil-lubricated stern tube bearing." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, no. 11 (May 2019): 1773–81. http://dx.doi.org/10.1177/1350650119846004.

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Bearings of propeller shafts are very crucial elements of the propulsion system of each of the ships. The safety of shipping depends on their durability and reliability. The new legal restrictions mean that today we are looking for environmentally friendly solutions. That is why water-lubricated bearings are becoming more and more popular. So, will oil-lubricated shaft bearings belong to the past? The bearing with a white metal bushing lubricated with mineral oil, which was subjected to experimental tests, has a number of advantages. First of all, it works in the area of full fluid friction, and in typical shipbuilding conditions it has a significant excess of hydrodynamic load capacity. Therefore, replacing mineral oil with an environmentally friendly lubricant with a similar viscosity seems to be a promising solution. Motion resistance larger than that in water-lubricated bearings compensates for the reliability and durability of this solution.

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31

Zhang, Sheng Dong, Zheng Lin Liu, and Hong Tao Yu. "Operating Performance Study of Ship’s Propulsive Shaft Including Stern Bearing’s Stiffness." Applied Mechanics and Materials 271-272 (December 2012): 1586–91. http://dx.doi.org/10.4028/www.scientific.net/amm.271-272.1586.

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In this paper, making ship propulsion shaft as the research object, We do research on characteristics of water-lubricated stern tube bearings and operating performance of ship’s propulsion shaft. Using FEM to discuss the impact law of the geometric properties to water-lubricated rubber bearing stiffness. Combining multiple dynamic and FEM theory, we build propulsion shaft rigid-flexible coupling dynamic model and discuss the influence of stern bearings’ stiffness. Results show that: In a certain scope, water-lubrication stern tube bearing’s stiffness changes in linear rule to the length-diameter ratio, and nonlinear change to radius ratio. Bearings’ stiffness has little influence on reaction force, but has much influence on displacement acceleration.

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32

Peng, Jin Min, and Min Feng Luo. "A Study on the Modification of Water Lubrication Bearing Materials." Advanced Materials Research 287-290 (July 2011): 1481–85. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.1481.

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Water lubricated bearings differ from water lubricated bearings in its special choice of material. A novelty material developed with an aim to improve the lubricating performance and bearing capacity, water lubricated bearings BTG plastic alloy is based on latex material, synthesized with different fillings, accelerators and other matters, and displays great mechanical and friction properties. In order to expand its application to the field of water lubrication, a bettered formula was adopted from the aspects of vulcanization, reinforced filling and softened plastification systems to improve its mechanical property. In the experiment, three-leveled orthogonal tests were conducted for the three systems to test the tensile strength, tearing strength, stress at definite elongation, hardness and tensile rate. The impacts of the respective systems were analyzed and the content of each component are determined to get the optimal formula. The modified bearings enjoy some mechanical properties that live up to or even exceed American military standards MIL-B-17901(Vessel).

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33

Chen, Pingwei, Tong Wang, Wensheng Ma, Fangzhong Li, Tianzhou Wang, and Tao Chen. "Characteristic Analysis of Water Lubricated Plain Journal Bearing under Transient Load." Journal of Physics: Conference Series 2160, no. 1 (January 1, 2022): 012073. http://dx.doi.org/10.1088/1742-6596/2160/1/012073.

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Abstract Transient load has a huge impact on the life and stability of water-lubricated bearings. In this paper work, CFD software is used to analyse the dynamic characteristic of water lubricated bearings under different transient loads of 500N, 1000N, 2000N and 3000N. The water film pressure contour distribution at different transient time was given. The time-varying relationships between the different transient loads with bearing forces, the journal displacement, the maximum value of water film pressure as well as the minimum value of water film thickness are obtained. The results show that with the increase of transient load, the effective bearing area of dynamic water pressure film decreases, and the maximum pressure increases. The bearing forces, the journal displacement, the maximum value of water film pressure as well as the minimum value of water film thickness will increase fast.

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34

Feng, Hui Hui. "Dynamic Characteristics of a Rigid Spindle Supported by Water-Lubricated Bearings." Applied Mechanics and Materials 401-403 (September 2013): 121–24. http://dx.doi.org/10.4028/www.scientific.net/amm.401-403.121.

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In this paper, a rigid spindle supported by two identical water-lubricated journal bearings is proposed. The dynamic equations of motion are presented to predicate the performance of the spindle. Under the assumption of linearity, the responses of the rotor excited by constant external force and unbalance force are comprehensively discussed by the fourth Runge-Kutta method. To analyze the static and dynamic characteristics of the water-lubricated bearings, the bulk flow turbulent theory is used and numerically solved by finite difference method. Results of this investigation contribute a better understanding of the performance of a water-lubricated bearing-rotor system.

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35

Wang, You Qiang, and Chao Li. "Numerical Analysis of Hydrodynamic Lubrication on Water-Lubricated Rubber Bearings." Advanced Materials Research 299-300 (July 2011): 12–16. http://dx.doi.org/10.4028/www.scientific.net/amr.299-300.12.

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Water lubricated rubber bearings are one of the most appropriate bearings for underwater use. The most popular design used widely today is the straight fluted rubber bearing. The special configuration leads to partial hydrodynamic lubrication and low load capacity. A new bearing bush structure which is favorable for constructing continuous hydrodynamic lubrication was designed and produced for experiment in the paper. The eccentricity ratio of the new structure rubber bearing was measured under different loads in experiment. Used the measured eccentricity ratios, the load capacity was calculated by numerical simulation and compared with the given test values. The calculated values were in good agreement with the given test results. The results show that complete hydrodynamic lubrication can be formed in the new designed rubber bearing. The experimental results also indicate that there is an appropriate bearing clearance which the load capacity is up to the maximum.

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36

Wang, You Qiang, and Mei Shu Wang. "Experimental Study on the Tribological Properties of Water-Lubricated Rubber Bearings." Advanced Materials Research 291-294 (July 2011): 1454–57. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.1454.

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Water lubricated rubber bearing is one of the most appropriate bearings widely used in submerged pump for drainage. The apparatus for studying the tribological behaviors of the water lubricated rubber bearings has been devised and established in the paper. The experimental studies on the tribological properties of the rubber bearings have been conducted under different load and velocity using the apparatus. Effects of load and velocity on friction coefficient of the rubber bearings have been estimated. The experimental results show that the friction coefficient decreases with increasing velocity; the friction coefficient increases at first and then decreases with increasing load; the friction coefficient increases sharply with the rising temperature. The experimental results also indicate that there is an appropriate bearing clearance which the friction coefficient is minimum.

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37

Jin, Yong, and Lin Liu Zheng. "The Experimental Modal Analysis of Water-Lubricated Rubber Stern Bearing." Applied Mechanics and Materials 66-68 (July 2011): 1663–67. http://dx.doi.org/10.4028/www.scientific.net/amm.66-68.1663.

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With the widespread use of the water lubricated rubber stern bearing, researches around rubber bearings are becoming hot points in recent years and researches on dynamic characteristic are particularly important. The dynamic characteristics of vibration system depend mainly on its modality parameters. This paper presented experimental modal analysis of water-lubricated rubber stern bearing by hammering method, and by comparing the differences with the finite element simulating result, analyzed the rubber bearing based on linear modal analysis theory. Due to the nonlinearity of rubber material, although the natural frequency range of rubber layer could be gotten, it’s hard to get the precise modal shapes of it, yet the metal layer could get more precise results.

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38

Furuishi, Yoshiro, Takuya Suganami, Sakuei Yamamoto, and Kiyonori Tokumitsu. "Performance of Water-Lubricated Flat Spiral Groove Bearings." Journal of Tribology 107, no. 2 (April 1, 1985): 268–72. http://dx.doi.org/10.1115/1.3261042.

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The 8.6 cm diameter spiral groove bearings, solid type and support type, are designed for water-lubricated thrust application. The load-carrying capacity limit is obtained experimentally. The major conclusions are as follows: (1) The load-carrying capacity depends significantly upon the deformations of the bearing and the runner, which are caused by the temperature and hydrodynamic pressure distributions. (2) The load-carrying capacity limit is determined primarily by the surface roughness and the film thickness, and the maximum value of the load-carrying capacity obtained in this experiment is above 5 × 104 N. (3) The support type bearing gives better load-carrying capacity than the solid type.

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39

Lv, Fangrui, Chunxiao Jiao, Donglin Zou, Na Ta, and Zhu-shi Rao. "Analysis of misaligned water-lubricated polymer bearing with axial grooves." Industrial Lubrication and Tribology 71, no. 3 (April 8, 2019): 411–19. http://dx.doi.org/10.1108/ilt-08-2018-0320.

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Purpose The purpose of this paper is to analyze the lubrication behavior of misaligned water-lubricated polymer bearings with axial grooves. Design/methodology/approach A lubrication model considering journal misalignment, bush deformation and grooves is established. In dynamic analyses of shaft systems, bearings are usually simplified as supporting points. Thus, an approach for solving the equivalent supporting point location is presented. The influence of misalignment angle and groove number on film thickness, hydrodynamic pressure distribution, load-carrying capacity and ESP location is investigated. Findings As the misalignment angle increases, the location of the maximum pressure and ESP are shifted toward the down-warping end, and the load-carrying capacity of the bearing decreases. In comparison to the nine-groove bearing, the six grooves bearing has a higher load-carrying capacity and the ESP is located closer to the down-warping end for an equivalent misalignment angle. Practical implications The results of this study can be applied to marine propeller shaft systems and other systems with misaligned bearings. Originality/value A study on the lubrication behavior of misaligned water-lubricated polymer bearings with axial grooves is of significant interest to the research community.

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40

Liu, Xiao Yan, and Jia Sheng Wang. "Influence of Groove Molded Lines on the Lubrication Performance of Water-Lubricated Spiral Groove Thrust Bearings." Advanced Materials Research 694-697 (May 2013): 538–42. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.538.

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The water lubrication performance of spiral groove thrust bearings was affected by different groove molded lines. The pressure fields and the load capacity of water-lubricated spiral groove thrust bearings with different groove molded lines were simulated by computational fluid dynamics. The results show that the spiral groove which can produce the best loading capacity and steadier pressure field is appropriate to water-lubricated spiral groove thrust bearing. The line spiral groove can be used for decrease the process difficult when the loading capacity require is low.

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41

Zhang, Xiuli, Gengyuan Gao, Zhongwei Yin, Yanzhen Wang, and Chao Gao. "Numerical analysis and experimental research on load carrying capacity of water-lubricated tilting-pad thrust bearings." Mechanics & Industry 19, no. 2 (2018): 201. http://dx.doi.org/10.1051/meca/2018005.

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Water-lubricated bearings are expected to be widely used because of convenience, green, safe and energy saving. The purpose of this study is to investigate the load carrying property of water-lubricated tilting-pad thrust bearings. A large amount of numerical analyses are undertaken based on computational fluid dynamics and the optimization method of pivot location and the calculation method of minimum film thickness are summarized. A thrust bearing is designed according to the numerical results and is tested by experiments. The experimental results validate the numerical method and the minimum film thickness to surface roughness ratio corresponding to the change of bearing lubrication regime from mixed lubrication to hydrodynamic lubrication is obtained.

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42

Shatokhin, V. F. "Rotor Rolling over a Water-Lubricated Bearing." Thermal Engineering 65, no. 2 (February 2018): 93–97. http://dx.doi.org/10.1134/s0040601518020052.

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43

Tamboli, Ketan, and K. Athre. "Experimental Investigations on Water Lubricated Hydrodynamic Bearing." Procedia Technology 23 (2016): 68–75. http://dx.doi.org/10.1016/j.protcy.2016.03.071.

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44

Wang, You Qiang, Xiu Jiang Shi, and Fu E. Ren. "Friction and Wear Mechanism between Rubber and Nickel for Water Lubricated Bearings." Advanced Materials Research 530 (June 2012): 91–94. http://dx.doi.org/10.4028/www.scientific.net/amr.530.91.

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Water lubricated rubber bearing is one of the most appropriate bearings widely used in submerged pump for drainage. The water lubricated rubber bearings sometimes worked in absent-water conditions especially at the machine start or brake. The friction and wear characteristics of the water lubricated rubber/Nickel coating pair were tested under dry, wet and water lubrication conditions respectively on the high-speed ring-block friction and wear testing machine. The effect of load and speed on the friction coefficient was examined in the experiment. The friction and wear mechanism of the rubber/Nickel coating pair under different conditions was analyzed with the help of SEM in the paper. The results show that the adhesive wear mainly occurs under dry condition, the grain abrasion occurs under wet condition and boundary lubrication occurs under water lubrication.

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45

Piątkowska, Ewa. "Influence of solid particle contamination on the wear process in water lubricated marine strut bearings with NBR and PTFE bushes." Polish Maritime Research 28, no. 4 (December 1, 2021): 167–78. http://dx.doi.org/10.2478/pomr-2021-0059.

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Abstract This paper reports on a study of the influence of solid particle contamination on the wear process in water-lubricated slide bearings (steel-acrylonitrile-butadiene rubber (NBR) and steel-polytetrafluoroethylene (PTFE)). To compare the wear of the shaft journal and bushes (NBR and PTFE) when lubricated with fresh water and contaminated water, an experiment was carried out to identify key factors that influence the state of wear of slide bearing. The amount of wear was checked by means of geometric structure measurements on the journals, namely, roughness profile measurements using both a contact profilometer and an optical microscope. The obtained results enabled correlations between the material comprising the sliding sleeve, roughness of the journals and contamination inside the water-lubricated slide bearings.

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46

Chauhan, Nathi Ram, Arhantika Khera, Shubhi Agarwal, Mehak Bagri, and Aditi Aggarwal. "Effect of Nanoparticle on the Performance of Water Lubricated Journal Bearing." IOP Conference Series: Materials Science and Engineering 1228, no. 1 (March 1, 2022): 012032. http://dx.doi.org/10.1088/1757-899x/1228/1/012032.

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Abstract Journal bearings have widespread use in machinery with rotating shafts. Hydrodynamic journal bearings have lubricating fluid present between shaft and bearing to reduce friction and allow smooth operation. The lubricating fluid develops pressure when bearing is in operation and this pressure is used to carry load on the shaft. The commonly used lubricants in the industry are petroleum based synthetic oils. To do away with the disposal issues and toxicity regarding synthetic oils, water is used as the lubricating fluid for this study. The effect of adding nanoparticles to water is studied and a program in MATLAB is developed to determine the characteristics of bearing, namely load carrying capacity, coefficients of stiffness and coefficients of damping for shaft speeds 500 rpm, 1000 rpm and 1500 rpm. It is observed that addition of nanoparticles results in increased magnitude of load carrying capacity and the bearing exhibits high value of damping and stiffness coefficients indicating stability of shaft for every speed.

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47

Li, Fu Long, and Tan Han. "Research on Water-Lubricated Bearing Applied in Propulsion Improvement of Certain Type of Motorboat." Applied Mechanics and Materials 130-134 (October 2011): 965–69. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.965.

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With energy price and environmental pressure increasing, water-lubricated bearing has been further applied in ship propulsion system. By analyzing structure characteristic of propulsion system, especially propeller shaft system of the certain type of motorboat, the improving design is proposed that water-lubricated bearing made by new improved material of MC nylon is used to substitute the oil-lubricated bearing. The abrasion characteristics test for improved motorboat bearing is made, which is analyzed by way of comparison with material sample test to predict useful life, and its environmental suitability analyzed. The results show that the bearing improvement of motorboat propulsion system has met the using requirements, and improved propulsion reliability, lowered fuel consumption, avoided water pollution, saved maintenance costs, and been the significant social and economic benefits.

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48

Peng, Jin Min. "Water Lubricated Bearing Molding Technology Impact on Bearing Bush Material Performance." Advanced Materials Research 382 (November 2011): 408–13. http://dx.doi.org/10.4028/www.scientific.net/amr.382.408.

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Water lubricated plastic alloy bearing molding technology determines the mechanical properties and performance of the product. The influence of molding temperature and time are significant on the performance of water lubricated bearing. The experiment selected five vulcanization temperatures from 110°C-190°C, and five time points from 5-25min to assess their influence on the tensile strength, stretching strength and abradability of bearing material. The corelation between temperature and time is analyzed and a vulcanization curve of plastic alloy production in the situation of 170°C (vulcanization temperature), 2Mpa (vulcanization pressure). The curve realizes a long vulcanization induction period at a fast vulcanization speed with a broad vulcanization plateau that reduces the vulcanization time in the production process and enhances efficiency massively.

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49

Feng, Huihui, and Shuyun Jiang. "Dynamic analysis of water-lubricated motorized spindle considering tilting effect of thrust bearing." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 20 (May 30, 2016): 3780–90. http://dx.doi.org/10.1177/0954406216652437.

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Анотація:

The dynamic modeling for the rotor with large diameter thrust bearings is one of the key issues in the design and operation of water-lubricated motorized spindle. In the machining process, the spindle not only translates along the x, y, z directions, but also tilts about the x and y axes under the cutting forces. As a result, the tilting effect of the thrust bearing on the dynamic performances of the motorized spindle should be considered. A five degree-of-freedom dynamic model for the spindle is established based on the Newton’s Laws and the principle of Angular Momentum. The translational and tilting dynamic coefficients for both the journal and thrust water-lubricated bearings were obtained by using Reynolds equation. The computed results show that the tilting effect of the thrust bearing on the dynamic performance of the motorized spindle should be considered when a large diameter thrust bearing is employed.

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50

Feng, Huihui, and Liping Peng. "Numerical analysis of water-lubricated thrust bearing with groove texture considering turbulence and cavitation." Industrial Lubrication and Tribology 70, no. 6 (August 13, 2018): 1127–36. http://dx.doi.org/10.1108/ilt-07-2017-0204.

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Purpose This paper aims to establish the mathematical models for the water-lubricated thrust bearing with groove texture considering turbulence and cavitation and numerically analyze the influence of rotary speed, texture depth, groove number and groove width on the static performance of the bearing. Design/methodology/approach The turbulent Reynolds equation and the Jakobsson–Floberg–Olsson cavitation model are adopted for the analysis. The Payvar–Salant algorithm and Finite difference schemes are used to discretize the governing equations. To illustrate the influence of turbulence, the performance of the bearing predicted by the turbulent and laminar models are compared. Findings According to the results, the load capacity and the friction force calculated by the turbulent model are greater than those obtained by laminar model, and the deviation between them gradually increases with the increased rotary speed. So, the turbulent effect should be fully considered for high-speed water-lubricated bearing with surface texture. There exists a peak value for the load capacity of the water-lubricated thrust bearing in respect to the texture depth, the number of grooves and the groove width ratio, while the friction force varies slowly with those parameters. Well-designed groove texture can improve the performance of the water-lubricated thrust bearing. Originality/value This paper proposes a mathematical model considering turbulent and cavitation effect for water-lubricated thrust bearing with surface texture. This model can be complementary to conventional laminar model which is used to analyze the performance of textured bearing at low rotary speed.

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