Готові списки джерел за темами / Water-lubricated bearing

Добірка наукової літератури з теми "Water-lubricated bearing"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 29 січня 2023

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Статті в журналах з теми "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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Анотація:
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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Анотація:
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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Анотація:
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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Анотація:
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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Анотація:
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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Анотація:
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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Анотація:
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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Анотація:
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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Анотація:
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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Анотація:
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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Більше джерел

Дисертації з теми "Water-lubricated bearing"

1

Heberley, Brian Douglas. "Advances in hybrid water-lubricated journal bearing for use in ocean vessels." Thesis, Cambridge, Massachussetts, Massachussetts Institute of Technology, 2013. http://hdl.handle.net/10945/41622.

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Анотація:
CIVINS
The outboard bearings that support shafts in naval ships and submarines present unique challenges to designers, shipbuilders, and operators. Such bearing must operate continuously and reliably in demanding environments at speeds that vary from below 1 rpm to well over 100 rpm. Water-lubricated bearings typically used for these applications operate hydrodynamically and are prone to adverse effects at lower speeds such as increased abrasive and adhesive wear as well as stick-slip shaft motion. This project focuses on developing a hybrid journal bearing capable of operating with hydrostatic pump pressure at lower rpm, while still maintaining the capability for hydrodynamic operation at higher rpm. Benefits of such a system include extending the periodicity between outboard bearing replacements, less abrasion and scoring damage to the propulsion shaft and preventing stick-slip shaft motion. To enable the in-water replacement of bearings without removal of the propulsion shaft, a partial arc (<180 degree wrap) configuration is required. This partial arc constraint introduces several unique manufacturing difficulties. To address this, a novel manufacturing process has been developed that enables the rapid fabrication of high precision bearings with diameter and roundness errors of less that 0.001" (25.4 microns) on a normal diameter of 3.24" as measured with a Coordinate Measuring Machine - greatly exceeding the published tolerances of conventional methods. A unique experimental test rig was designed and built in order to measure the performance of 15 different prototype bearing designs. The rig is capable of submerged bearing testing in both hydrostatic and hydrodynamic modes of operation, with funddamental parameters such as speed, torque, loads, pressures, flow rates, and shaft position recorded. The operating characteristics of the bearing were then analyzed to identify key features and variables affecting bearing performance. Certain bearing designs were found to be inherently stable for side loading conditions, without the use of compensation typically used in hydrostatic bearings. This finding led to bearing designed with simplified hydrostatic features and fluid supply systems. Such designs wre found to have minimal degradation in hydrodynamic performance, making them particularly suitable for use as hybrid bearings. The key design drivers identified in this work are combined with ancillary factors to discuss the feasiblity of hybrid bearings for use in marine applications.
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2

Elgezawy, Ahmed Sayed. "A theoretical and experimental study of water lubricated non-metallic journal bearings." Thesis, Queensland University of Technology, 1996.

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3

Cabrera, D. L. "An investigation into the operation of water-lubricated rubber journal bearings." Thesis, Liverpool John Moores University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521743.

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4

Heberley, Brian Douglas. "Advances in hybrid water-lubricated journal bearings for use in ocean vessels." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/81753.

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Анотація:
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2013.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (p. 439-441).
The outboard bearings that support shafts in naval ships and submarines present unique challenges to designers, shipbuilders, and operators. Such bearings must operate continuously and reliably in demanding environments at speeds that vary from below 1 rpm to well over 100 rpm. Water-lubricated bearings typically used for these applications operate hydrodynamically and are prone to adverse effects at lower speeds such as increased abrasive and adhesive wear as well as stick-slip shaft motion. This project focuses on developing a hybrid journal bearing capable of operating with hydrostatic pump pressure at lower rpm, while still maintaining the capability for hydrodynamic operation at higher rpm. Benefits of such a system include extending the periodicity between outboard bearing replacements, less abrasion and scoring damage to the propulsion shaft, and preventing stick-slip shaft motion. To enable the in-water replacement of bearings without removal of the propulsion shaft, a partial arc (<180 degree wrap) configuration is required. This partial arc constraint introduces several unique manufacturing difficulties. To address this, a novel manufacturing process has been developed that enables the rapid fabrication of high precision bearings with diameter and roundness errors of less than 0.001" (25.4 microns) on a nominal diameter of 3.24" as measured with a Coordinate Measuring Machine - greatly exceeding the published tolerances of conventional methods. A unique experimental test rig was designed and built in order to measure the performance of 15 different prototype bearing designs. The rig is capable of submerged bearing testing in both hydrostatic and hydrodynamic modes of operation, with fundamental parameters such as speed, torque, loads, pressures, flow rates, and shaft position recorded. The operating characteristics of the bearings were then analyzed to identify key features and variables affecting bearing performance. Certain bearing designs were found to be inherently stable for side loading conditions, without the use of compensation typically used in hydrostatic bearings. This finding led to bearings designed with simplified hydrostatic features and fluid supply systems. Such designs were found to have minimal degradation in hydrodynamic performance, making them particularly suitable for use as hybrid bearings. The key design drivers identified in this work are combined with ancillary factors to discuss the feasibility of hybrid bearings for use in marine applications.
by Brian Douglas Heberley.
Ph.D.
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5

Tanamal, Tan Kong Hong Ryan. "Modelling of fluid flow in multiple axial groove water lubricated bearings using computational fluid dynamics." Thesis, Queensland University of Technology, 2007. https://eprints.qut.edu.au/16531/1/Tan_Tanamal_Thesis.pdf.

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Анотація:
Extensive research has been conducted in the area of journal bearings over many years for various operating conditions and geometry, effects of different types of lubricants (oil and water), different numbers (zero, one and three) and positions of grooves and the flow of lubricant between the shaft and bearing. One area of research has been developing methods to minimize the experimental time and cost of predicting the performance of journal bearings operating over a wide variety of conditions. This has led to numerical methods being developed and utilised for this purpose. Numerical methods are an important foundation for the development of Computational Fluid Dynamics (CFD). CFD method has proved to be a very useful tool in this research field. This project uses a CFD (specifically FLUENT) approach to simulate the fluid flow in a water lubricated journal bearing with equal spaced axial grooves. Water is fed into the bearing from one end. The lubricant is subjected to a velocity induced flow, as the shaft rotates and a pressure induced flow, as the water is pumped from one end of the bearing to the other. CFD software is used to simulate the fluid flow phenomenon that occurs during the process. Different parameters such as eccentricity ratio, number of grooves and groove orientation to the load line were examined. Lubricant pressure and velocity profiles were obtained and compared with available theoretical and experimental results. Two dimensional studies showed that the predicted maximum pressure and load carrying capacity from CFD were similar to the results from theoretical calculations. A small percentage difference (1.78% - 3.76%) between experimental and theoretical results was found. The pressure distribution in the lubricant shows that grooves decrease the pressure and load carrying capacity of the bearing. Swirl or turbulence does occur in the groove is affected by the viscosity of the lubricant. Three dimensional studies show that the pressure drops linearly from one end of the bearing to the other for no groove, concentric and three grooves cases. As the eccentricity increases, for one groove cases, the shape of the pressure profile changes to parabolic shape at positive region while the other pressure profiles drop linearly. The magnitude of the velocity it the bearing gap increased from 0.8 m/s to about 2.9 m/s when the shaft speed increased from zero to 5.5 m/s for a concentric and no groove case, similar changes were noted for all other cases. An interesting observation occurs when implementing the pressure profiles along the bearing. At cases such as zero and one groove condition and e = 0.4 and 0.6, lubricant flow back is observed at both inlet and outlet i.e. at certain area of the inlet, lubricant flowed out of the bearing against the supply pressure, a similar situation occurred at the exit of the bearing.
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6

Tanamal, Tan Kong Hong Ryan. "Modelling of fluid flow in multiple axial groove water lubricated bearings using computational fluid dynamics." Queensland University of Technology, 2007. http://eprints.qut.edu.au/16531/.

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Анотація:
Extensive research has been conducted in the area of journal bearings over many years for various operating conditions and geometry, effects of different types of lubricants (oil and water), different numbers (zero, one and three) and positions of grooves and the flow of lubricant between the shaft and bearing. One area of research has been developing methods to minimize the experimental time and cost of predicting the performance of journal bearings operating over a wide variety of conditions. This has led to numerical methods being developed and utilised for this purpose. Numerical methods are an important foundation for the development of Computational Fluid Dynamics (CFD). CFD method has proved to be a very useful tool in this research field. This project uses a CFD (specifically FLUENT) approach to simulate the fluid flow in a water lubricated journal bearing with equal spaced axial grooves. Water is fed into the bearing from one end. The lubricant is subjected to a velocity induced flow, as the shaft rotates and a pressure induced flow, as the water is pumped from one end of the bearing to the other. CFD software is used to simulate the fluid flow phenomenon that occurs during the process. Different parameters such as eccentricity ratio, number of grooves and groove orientation to the load line were examined. Lubricant pressure and velocity profiles were obtained and compared with available theoretical and experimental results. Two dimensional studies showed that the predicted maximum pressure and load carrying capacity from CFD were similar to the results from theoretical calculations. A small percentage difference (1.78% - 3.76%) between experimental and theoretical results was found. The pressure distribution in the lubricant shows that grooves decrease the pressure and load carrying capacity of the bearing. Swirl or turbulence does occur in the groove is affected by the viscosity of the lubricant. Three dimensional studies show that the pressure drops linearly from one end of the bearing to the other for no groove, concentric and three grooves cases. As the eccentricity increases, for one groove cases, the shape of the pressure profile changes to parabolic shape at positive region while the other pressure profiles drop linearly. The magnitude of the velocity it the bearing gap increased from 0.8 m/s to about 2.9 m/s when the shaft speed increased from zero to 5.5 m/s for a concentric and no groove case, similar changes were noted for all other cases. An interesting observation occurs when implementing the pressure profiles along the bearing. At cases such as zero and one groove condition and e = 0.4 and 0.6, lubricant flow back is observed at both inlet and outlet i.e. at certain area of the inlet, lubricant flowed out of the bearing against the supply pressure, a similar situation occurred at the exit of the bearing.
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7

Solomonov, Yuriy. "Experimental investigation of tribological characteristics of water-lubricated bearings materials on a pin-on-disk test rig." Thesis, 2014. http://hdl.handle.net/2440/84676.

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Анотація:
Friction is the most fundamental phenomenon accompanying the sliding motion of solid bodies. Friction, vibration, and wear under conditions of contaminated water lubrication are extremely important in many engineering applications such as water-lubricated bearings, water pumps, and braking systems. The aim of this project is to investigate the factors that could lead to an improvement in the performance of water-lubricated bearings materials. Previous studies have revealed the main factors contributing to power loss are friction-induced vibrations, and wear in water-lubricated bearings. Those factors are the result of contamination of the lubricant (sea water); bearing alignment (parallelism of the shaft and shell); material characteristics; and condition of the contact (sliding) surfaces. The contact mechanics of the water-lubricated bearings as well as the performance characteristics of the bearings components on which friction is exerted also have a substantial influence on the tribological characteristics of water-lubricated bearings materials. Thus, the focus of the present study is on the effect of water contamination on the friction coefficient, vibration, wear and the vibration–wear relationship under varying operational conditions. An experimental program was conducted to develop new methods and investigate the effect of water contamination on the tribological characteristics of pairs of materials under different operational conditions for water-lubricated bearings. A Pin-on-Disk test rig was designed and built to adopt the operational environment of a real water-lubricated bearing. This test rig was used to obtain experimental data regarding the effect of water contamination on the long-term behaviour of the bearing systems, and to investigate the friction, vibration, wear, and vibration-wear characteristics of the materials. The effect of various parameters, such as the friction conditions, damping, and operational environment on the behaviour of the bearing materials was also investigated. The experiments demonstrated that all three factors, namely contamination, material properties and surface conditions, have a significant influence on the tribological characteristics of water-lubricated bearings. It was also demonstrated that when the operation of the water-lubricated bearing takes place in boundary and mixed regimes, the adhesive and abrasive mechanisms of friction are significant and contribute to the generation of excessive wear and vibration. This is contrary to what is claimed by many manufacturers. It was observed that the wear mechanism in the water-lubricated bearing materials was associated with low-frequency vibrations and severe contamination of the lubricant. Also, as expected, the vibration–wear relationship of the water-lubricated bearing materials was significantly affected by the contamination of the lubricant and can be changed by magnetic field damping. The present study identified the primary mechanism responsible for the high friction coefficient, vibration, and wear to be a three-body mechanism caused by the abrasive nature of the water contaminant. It was found that there was a significant increase in the friction coefficient, vibration, and specific wear rate at the slowest sliding speed of 0.393 m/s. This is due to the boundary regime of lubrication, the adhesive-abrasive wear mechanism, and specific material properties of NF22 (Railko) material. It was also explored and reported that for a specific applied load of 8 N, at low and high sliding speeds, and water contamination levels, damping has a strong effect on the vibration–wear relationship which is also dependent on sliding speed and, as a result, on the lubrication regime. The significance of this experimental study is to improve the selection of water-lubricated bearings materials and as a result, improve their performances. The outcomes of this research project are: • Analysis of the existing types of materials, and experimental models and techniques for modelling and simulating the operational conditions of water-lubricated bearings • Identification of the existing problems associated with the contemporary technology of water-lubricated bearings materials • Development of an experimental methodology and technique for the application of a Pin-on-Disk test rig and determination of the main contributing factors • Identification and analysis of various lubrication and operational conditions for water-lubricated bearing materials and systems and development of further recommendations for future work.
Thesis (M.Phil.) -- University of Adelaide, School of Mechanical Engineering, 2014
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Книги з теми "Water-lubricated bearing"

1

Litwin, Wojciech. Water Lubricated Journal Bearings: Marine Applications, Design, and Operational Problems and Solutions. Elsevier Science & Technology Books, 2024.

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Частини книг з теми "Water-lubricated bearing"

1

Jianhua, Zhao, Gao Dianrong, and Wang Qiang. "Research on Static Performance of Water-Lubricated Hybrid Bearing with Constant Flow Supply." In Recent Developments in Intelligent Systems and Interactive Applications, 66–72. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-49568-2_10.

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2

Shinde, Anil B., Prashant M. Pawar, Sunil Gaikwad, Pakija A. Shaikh, and Yashpal Khedkar. "Analysis of Water Lubricated Bearing with Different Features to Improve the Performance: Green Tribology." In Techno-Societal 2016, 761–69. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-53556-2_78.

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3

Pai, R., and D. J. Hargreaves. "Water Lubricated Bearings." In Green Tribology, 347–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-23681-5_13.

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4

Adams, Maurice L. "Water-Lubricated High-Speed Bearings." In Rotating Machinery Research and Development Test Rigs, 137–43. Boca Raton : Taylor & Francis, CRC Press, [2017]: CRC Press, 2017. http://dx.doi.org/10.1201/9781315116723-14.

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5

Wang, Jiaxu. "Water-Lubricated Rubber Alloy Bearings and Transmission Systems." In Encyclopedia of Tribology, 3977–81. Boston, MA: Springer US, 2013. http://dx.doi.org/10.1007/978-0-387-92897-5_1211.

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6

Javorova, Juliana, and Alexandru Radulescu. "Performance of Water Lubricated Journal Bearings Under Elastic Contact Conditions." In Machine and Industrial Design in Mechanical Engineering, 141–49. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-88465-9_11.

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7

"Water-Lubricated Bearings." In Encyclopedia of Tribology, 3977. Boston, MA: Springer US, 2013. http://dx.doi.org/10.1007/978-0-387-92897-5_101520.

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8

Lidgitt, P. J., D. W. F. Goslin, C. Rodwell, and G. S. Ritchie. "Paper IV(v) Hard-on-hard water lubricated bearings for marine applications." In Tribology Series, 129–38. Elsevier, 1987. http://dx.doi.org/10.1016/s0167-8922(08)70938-6.

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Тези доповідей конференцій з теми "Water-lubricated bearing"

1

Yamajo, Seiji, and Fumitaka Kikkawa. "PTFE Compound Bearing for Water Lubricated Shaft Systems." In SNAME 10th Propeller and Shafting Symposium. SNAME, 2003. http://dx.doi.org/10.5957/pss-2003-09.

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Анотація:
The paper outlines the development and applications of compound bearings made of PTFE (Poly Tetra Fluoro Ethylene) and synthetic rubber, which enable the shaft to start up without initial lubricating water. The unique characteristic is the three-layer structure using elastic, synthetic rubber which is sandwiched between the PTFE compound and the outer metal shell. This special structure is designed to solve bearing issues that are incompatible with each other. That the bearing has sufficient hardness to be excellent against wear and yet is flexible to compensate for shaft misalignment and vibration. Friction characteristics and performance data are introduced comparing PTFE and conventional rubber bearings. Long-time running tests are carried out in very demanding conditions and the test data are shown. Over 15 years of actual operational service data on naval vessels and high speed, long-distance cruising ferries are introduced.
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2

Litwin, Wojciech. "Water Lubricated Hybrid Propeller Shaft Bearings With Polymer Bearing Bush." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63072.

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The article deals with water lubricated hybrid marine propeller shaft bearing which was designed and built at the Faculty of Ocean Engineering and Ship Technology of the Gdansk (Poland) University of Technology. The article contains the following parts: • Description of the test stand, the simulated working conditions, and tested bearings’ specifications. • Results of the conducted measurements. The results of the experimental work include: graphs of friction coefficient, pressures in the water hydrodynamic film and shaft trajectory. • Comparison of hybrid bearing with two others bearings. Typical main shaft bearing with grooved bearing bush working in a semi fluid friction conditions and hydrodynamic bearing with cull bearing bush (without any grooves). The work’s essential conclusion is that fluid film lubrication is possible also in hybrid bearings with grooves. As it was proven under simulated working conditions hydrodynamic lubrication does not take place in typical bearing with grooved bearing bush.
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3

Litwin, Wojciech. "Water Lubricated Polymer Hydrodynamic Bearing With Full and Grooved Bearing Bushing." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79534.

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The topic of this article is conducting of the measurements on water lubricated main shaft bearings. The article contains the following parts: • Introduction in which the genesis and the main idea of work are described. • Description of the test stand, the simulated working conditions, and the bearing specifications. • Presentation and description of the conducted measurements. • Comparison of hydrodynamic bearing with the typical main shaft bearing with a grooved bearing bushing working in a semi fluid friction conditions. • Conclusion.
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4

Sada, Hiroyuki, Tomohiro Tanaka, Fumitaka Kikkawa, Yoshimasa Kachu, and David W. Hawkins. "PTFE Partial Arc Bearing for Large Water-lubricated Tail-shafts." In SNAME 13th Propeller and Shafting Symposium. SNAME, 2012. http://dx.doi.org/10.5957/pss-2012-003.

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PTFE (Poly-Tetra-Fluoro-Ethylene) is a well-known bearing material used to provide low friction for water-lubricated shafts. Partial arc design bearings are attracting keen interest due to reduce friction, since it develops a hydrodynamic film even in water lubrication. However, the application of both PTFE material and a partial arc design is limited to small bearings, because conventional PTFE partial arc bearings are manufacture in ring form and PTFE rings have strict limitation in size. In this paper, a newly developed, PTFE partial arc bearing for large water-lubricated tail-shafts is outlined. Friction, wear and deformation properties of the new bearing are described. In addition, wear life prediction is proposed for the PTFE partial arc bearing.
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5

Deng, Xin, Cori Watson, Brian Weaver, Houston Wood, and Roger Fittro. "Lubricant Inertia in Water Lubricated Bearings." In ASME 2017 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/fedsm2017-69110.

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Oil-lubricated bearings are widely used in high speed rotating machines such as those used in the aerospace and automotive industries. However, with some applications including underwater machinery and environmentally friendly applications, water lubricated bearings have become increasingly used. Due to the different fluid properties between oil and water — namely viscosity — the use of water increases the Reynolds numbers drastically and, therefore, makes water-lubricated bearings prone to turbulence and fluid inertia effects. In other words, the linear approximation of the fluid film reaction forces due to the stiffness and damping parameters — as suggested in the traditional Reynolds equation — is not adequate and should be amended to include lubricant added mass. This is because water-lubricated bearings exhibit large lubricant inertia forces on the order of viscous forces. Additionally, stiffness and damping coefficients should be calculated with the turbulence effects included. The aim of this study was to investigate the methodology of modifying the traditional Reynolds equation to include lubricant inertia effects. This paper reviews the current status of research in the lubricant inertia of bearings and explores the development of methodologies to modify the Reynolds equation to include lubricant inertia in bearings. The Reynolds equation is a partial differential equation governing the pressure distribution of thin viscous fluid films in lubrication theory. The thin film hypothesis is used to directly relate the bearing film thickness to the lubricant film pressure. Adding lubricant inertia to the Reynolds equation is vital to improving the accuracy of the bearing model and more specifically its film pressure which is essential to predicting load carrying capabilities. The film pressure relates the gradient of the velocity tensor through the Reynolds equation, and resulting shear stresses then allow the turbulent momentum equations to be written in terms of an eddy-viscosity value. An extended Reynolds equation should be developed which takes into account turbulence and both convective and temporal inertia. The most complete form of the temporal inertia effect model should be developed and applied to the turbulent regime, consisting of both primary and secondary temporal inertia terms. The convective inertia model follows Constantinescu’s approach. This analysis develops a lubricant inertia model applicable to water-lubricated bearings. The results of this study could aid in improving future designs and models of water-lubricated bearings.
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Chen, Xin, Hualing Zhao, Yufeng Gui, and Shesheng Zhang. "Parallel Numerical Model of Water Lubricated Rubber Bearing." In 2014 13th International Symposium on Distributed Computing and Applications to Business, Engineering and Science (DCABES). IEEE, 2014. http://dx.doi.org/10.1109/dcabes.2014.38.

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7

San Andrés, Luis, Michael Rohmer, and Scott Wilkinson. "Static Load Performance of a Water Lubricated Hydrostatic Thrust Bearing." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63385.

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In rotating equipment, thrust bearings aid to balance axial loads and control shaft position. In turbomachinery, axial loads depend on shaft speed and pressure rise/drop on the impellers. This paper details a water lubricated test rig for measurement of the performance of hydrostatic thrust bearings (HTBs). The rig contains two water lubricated HTBs (105 mm outer diameter), one is the test bearing and the other a slave bearing. Both bearings face the outer side of thrust collars of a rotor. The paper shows measurements of HTB axial clearance, flow rate, and recess pressure for operation with increasing static load (max. 1.4 bar) and supply pressure (max. 4.14 bar) at a rotor speed of 3 krpm (12 m/s OD speed). Severe angular misalignment, static and dynamic, of the bearing surface against its collar persisted and affected all measurements. The HTB axial clearance increases as the supply pressure increases and decreases quickly as the applied load increases. The reduction in clearance increases the flow resistance across the film lands thus reducing the through flow rate with an increase in recess pressure. In addition, an estimated bearing axial stiffness increases as the operating clearance decreases and as the supply pressure increases. Predictions from a bulk flow model qualitatively agree with the measurements. Alas they are not accurate enough. The differences likely stem from the inordinate tilts (static and dynamic) as well as the flow condition. The test HTB operates in a flow regime that spans from laminar to incipient turbulent. Quantification of misalignment at all operating conditions is presently a routine practice during operation of the test rig.
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8

Litwin, Wojciech. "Marine Water Lubricated Stern Tube Bearings: Design and Operation Problems." In ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44081.

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Faculty of Ocean Engineering and Ship Technology of Gdansk University of Technology (Poland) co-operates with ship industry and some well known manufactures of water lubricated bearings. In the last few years, three various test stands for research work with water lubricated main shaft bearings were designed and built. They were used for many different tests with various kinds of bearings. The testing process helped to understand and prove some phenomena. Water lubricated stern tube bearings are often used on modern ships. This environmentally friendly bearing is much cheaper than popular oil lubricated one. The difference in price is a result of simplicity of the bearing unit and lower material costs. Unfortunately, there were many serious breakdowns associated with this kind of bearing. Sometimes the wear process was very rapid. It was mainly a result of problems with stability of the hydrodynamic film, poor material properties or unfavorable working conditions. Theoretically, water lubricated stern tube bearings operate in hydrodynamic regime. Loads are low because of high bearing length to shaft diameter ratio (L/D). Sliding speed depends on engine type, main gear ratio and ship size. Generally, the speed could be even higher than 3 meters per second, which should be sufficient for hydrodynamic lubrication. So why are there problems with this kind of bearings? There are three main groups of reasons — design flaws, ship specific problems and negative influence of sea environment.
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Mallya, Ravindra, H. Girish, B. Satish Shenoy, and Raghuvir Pai. "Experimental Investigation on Axial Groove Water Lubricated Journal Bearing." In 2021 International Conference on Maintenance and Intelligent Asset Management (ICMIAM). IEEE, 2021. http://dx.doi.org/10.1109/icmiam54662.2021.9715195.

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10

Shoyama, Tadayoshi, Kazuyuki Kouda, and Takeshi Ogata. "Saturated Water Journal Bearings of a Turbo Compressor." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-58131.

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We have developed a water lubricated journal bearing for water vapor turbo compressor. Utilizing working fluid as liquid lubricant has advantages on high efficiency and structural simplicity of oil-free system. But the evaporation of lubricant effects on various kinds of dynamic properties which must be considered during the development of turbo compressors. The loss, stability, and heat transfer of water lubricated bearings, and the effects of cavitation were studied. When the sub-cool of lubricant water is small, vaporous cavitation is likely to appear. Vaporous cavitation is essentially different from gaseous cavitation of general oil-lubricated bearings in that the evaporation of lubricant occurs which involves latent heat. Because the vaporous cavitation reduces the viscosity loss, and the bearing is cooled not only by sensible heat but also by latent heat, the bearing temperature elevation is suppressed. Another effect of cavitation is stabilization of half speed whirl. We conducted two experiments. Firstly, a sub-scale bearing experiment which consists of 2 conical journal bearings, to investigate the above effects quantitatively and develop a prediction method. Secondly, a full-scale bearing experiment to demonstrate the bearings. As a result, we could drive a 28kg rotor at 31,000rpm stably and efficiently with water lubricated journal bearings.
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Звіти організацій з теми "Water-lubricated bearing"

1

Cooley, Craig, H., Michael,, M. Khonsari, and Brent Lingwall. The Development of Open Water-lubricated Polycrystalline Diamond (PCD) Thrust Bearings for Use in Marine Hydrokinetic (MHK) Energy Machines. Office of Scientific and Technical Information (OSTI), November 2012. http://dx.doi.org/10.2172/1056274.

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