The Experts below are selected from a list of 6702 Experts worldwide ranked by ideXlab platform
Qian Cong - One of the best experts on this subject based on the ideXlab platform.
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effects of cylindrical pit array on tribological property of piston cylinder sleeve Friction Pair in a bw 250 slime pump
Tribology International, 2020Co-Authors: Tianyu Gao, Hong Zhang, Qian CongAbstract:Abstract This study designed a bio-inspired piston with a cylindrical pit array according to the BW-250 slime pump piston based on the surface structure of earthworm and leech. The Friction was tested and analyzed. The Friction Pair mechanic system was modeled for finite element analysis, and the oil film test was supplemented. Results demonstrate that the bio-inspired piston show a lower Friction force than the standard piston and a drag reduction rate that is above 10%. Cylindrical pit array can reduce the flow velocity of lubricating oil and increase the oil film pressure. The length and thickness of the oil film over the bio-inspired piston are higher than those of standard pistons.
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Effects of cylindrical pit array on tribological property of Piston–Cylinder sleeve Friction Pair in a BW-250 slime pump
Tribology International, 2020Co-Authors: Tianyu Gao, Zhang Hong, Xu Jin, Ma Boshuai, Qian CongAbstract:Abstract This study designed a bio-inspired piston with a cylindrical pit array according to the BW-250 slime pump piston based on the surface structure of earthworm and leech. The Friction was tested and analyzed. The Friction Pair mechanic system was modeled for finite element analysis, and the oil film test was supplemented. Results demonstrate that the bio-inspired piston show a lower Friction force than the standard piston and a drag reduction rate that is above 10%. Cylindrical pit array can reduce the flow velocity of lubricating oil and increase the oil film pressure. The length and thickness of the oil film over the bio-inspired piston are higher than those of standard pistons.
Cuntang Wang - One of the best experts on this subject based on the ideXlab platform.
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numerical investigation on thermal deformation of Friction Pair in hydro viscous drive
Applied Thermal Engineering, 2015Co-Authors: Jianzhong Cui, Fang-wei Xie, Cuntang WangAbstract:Abstract Thermal deformation of Friction Pair has a significant effect on the working performance of hydro-viscous drive. In order to investigate the combined effect of temperature variation and constraints on the thermo-elastic-plastic deformation of Friction Pair in hydro-viscous drive during the soft-start, transient thermal deformation model is established for numerical simulation. Thermo-elastic-plastic constitutive equations coupled with thermal strain and mechanical strain are described in detail. Using the constitutive equations derived, indirect coupling numerical method based on the finite element program is developed and used to predict distributions of the temperature, displacement and stress of the disks. The research results show that there are three types of saucer-shaped warping deformation and one type of wave-shaped warping deformation with regard to different constraints. The characteristics of various kinds of displacement and stress are concerned with thermal conductivity and constraints. When the disks are under double constraints, the maximum stress that surpasses the yield stress appears in the disk. When the disks are not under any constraints, minimum stress leads to minimum displacement. To a large extent the deformation size is decided by the location and number of constraints.
Fang-wei Xie - One of the best experts on this subject based on the ideXlab platform.
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effect of two phase flow on transmission characteristics of oil film between Friction Pair
International Journal of Structural Integrity, 2018Co-Authors: Haibin Chen, Fang-wei Xie, Jie Zhu, Xinjian Guo, Xudong ZhengAbstract:Purpose The purpose of this paper is to use the viscosity of fluid to transmit power known as the hydro-viscous drive (HVD) to research the effect of two-phase flow on transmission characteristics. Design/methodology/approach In this paper, a 3D computational model of oil film between Friction Pair was built to study the transmission characteristics of a two-phase oil film, and the distribution contours of pressure and temperature of oil film were investigated using the computational fluid dynamics technology. Findings The finding of the paper suggests that the distribution law of pressure and temperature of two-phase oil film is almost linear along the radial direction. However, since the physical phenomena near the outlet of the oil film are entirely different, there exists fluctuation. Meanwhile, the volume fraction of air was obtained at different rotation speeds, and the maximum value is 10.55 percent. Compared to the single-phase oil film, the torque transferred by the oil film is not linear with the rotation speed, its value decreases gradually. Originality/value This paper’s conclusions are very important for the study of HVD and its applications, which provide a new idea to further study the mechanism of oil film transmission and its cavitation. The development of fluid viscous speed clutch is dedicated to a large industrial fan and water pump speed regulation and energy saving. With the successful application of the technology, it will have more wide applications in different fields, such as, in steel, water, petrochemical, power plant of slag pump and exhaust fan.
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numerical investigation of cavitation effect on two phase oil film flow between a Friction Pair in hydro viscous drive
Proceedings of the Institution of Mechanical Engineers Part C: Journal of Mechanical Engineering Science, 2018Co-Authors: Fang-wei Xie, Xudong Zheng, Gang Sheng, Qi Sun, Ramesh K AgarwalAbstract:This paper describes a three-dimensional computational model of oil film between a Friction Pair to investigate the characteristics of both single-phase and two-phase flow of the oil film in hydro-...
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numerical simulation research on effect of oil groove forms on thermal behavior of Friction Pair in hydro viscous clutch
Industrial Lubrication and Tribology, 2016Co-Authors: Fang-wei Xie, Yaowen Tong, Bing Zhang, Kaiyu DaiAbstract:Purpose – The purpose of this paper is to study the influence of different cross-sectional shapes (rectangular, trapezoidal, oval and triangular) and layout forms of oil grooves (radial, circumferential, inclined, compound, helical and double-helical), and determine the optimal section shape and layout form of oil grooves on the temperature field. Design/methodology/approach – Heat conduction theory model was established based on startup characteristics and Friction heat principle of hydro-viscous clutch (HVC), and then the theoretical expression of angular velocity of the Friction Pair and control pressure were deduced, and the heat flux and its distribution on Friction disk and separator disk were calculated. Finally, the finite element method was used to solve the temperature field of the Friction Pair. Findings – The studies show that the circumferential oil groove got the highest temperature, and on the surface of all other structures, hot spots appear with different sizes and temperatures, and the m...
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numerical investigation on thermal deformation of Friction Pair in hydro viscous drive
Applied Thermal Engineering, 2015Co-Authors: Jianzhong Cui, Fang-wei Xie, Cuntang WangAbstract:Abstract Thermal deformation of Friction Pair has a significant effect on the working performance of hydro-viscous drive. In order to investigate the combined effect of temperature variation and constraints on the thermo-elastic-plastic deformation of Friction Pair in hydro-viscous drive during the soft-start, transient thermal deformation model is established for numerical simulation. Thermo-elastic-plastic constitutive equations coupled with thermal strain and mechanical strain are described in detail. Using the constitutive equations derived, indirect coupling numerical method based on the finite element program is developed and used to predict distributions of the temperature, displacement and stress of the disks. The research results show that there are three types of saucer-shaped warping deformation and one type of wave-shaped warping deformation with regard to different constraints. The characteristics of various kinds of displacement and stress are concerned with thermal conductivity and constraints. When the disks are under double constraints, the maximum stress that surpasses the yield stress appears in the disk. When the disks are not under any constraints, minimum stress leads to minimum displacement. To a large extent the deformation size is decided by the location and number of constraints.
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Oil Film State between Friction Pair in Hydro-Viscous Drive
Applied Mechanics and Materials, 2013Co-Authors: Fang-wei Xie, Yun Sen Hong, Gang Zheng, Shu Meng WangAbstract:In the paper, we research the flow state and the pressure of the oil film between the parallel and the deformed Friction Pairs to reveal the oil film state between the Friction Pair in hydro-viscous drive. Firstly, 3D physical models of the oil film were established. Then, the models were solved based on the principle of computational fluid dynamics. We found that the dynamic pressure goes up gradually along the radial direction; at zone with groove the dynamic pressure is higher, and the dynamic pressure between deformed interfaces is lower than that between parallel interfaces. The velocity of the oil film increases along the radial direction, and that between deformed interfaces is higher. The numerical results can provide some theoretic basis for the study of the HVD technology.
Tianyu Gao - One of the best experts on this subject based on the ideXlab platform.
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effects of cylindrical pit array on tribological property of piston cylinder sleeve Friction Pair in a bw 250 slime pump
Tribology International, 2020Co-Authors: Tianyu Gao, Hong Zhang, Qian CongAbstract:Abstract This study designed a bio-inspired piston with a cylindrical pit array according to the BW-250 slime pump piston based on the surface structure of earthworm and leech. The Friction was tested and analyzed. The Friction Pair mechanic system was modeled for finite element analysis, and the oil film test was supplemented. Results demonstrate that the bio-inspired piston show a lower Friction force than the standard piston and a drag reduction rate that is above 10%. Cylindrical pit array can reduce the flow velocity of lubricating oil and increase the oil film pressure. The length and thickness of the oil film over the bio-inspired piston are higher than those of standard pistons.
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Effects of cylindrical pit array on tribological property of Piston–Cylinder sleeve Friction Pair in a BW-250 slime pump
Tribology International, 2020Co-Authors: Tianyu Gao, Zhang Hong, Xu Jin, Ma Boshuai, Qian CongAbstract:Abstract This study designed a bio-inspired piston with a cylindrical pit array according to the BW-250 slime pump piston based on the surface structure of earthworm and leech. The Friction was tested and analyzed. The Friction Pair mechanic system was modeled for finite element analysis, and the oil film test was supplemented. Results demonstrate that the bio-inspired piston show a lower Friction force than the standard piston and a drag reduction rate that is above 10%. Cylindrical pit array can reduce the flow velocity of lubricating oil and increase the oil film pressure. The length and thickness of the oil film over the bio-inspired piston are higher than those of standard pistons.
Parvana E. Akhundova - One of the best experts on this subject based on the ideXlab platform.
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inverse problem of contact fracture mechanics for a hub of Friction Pair taking into account thermal stresses
Mathematics and Mechanics of Solids, 2019Co-Authors: Vagif M. Mirsalimov, Parvana E. AkhundovaAbstract:Methods of fracture mechanics enable a new approach to the design of structures, ensuring prevention of crack development. The plane problem of mechanics of contact fracture for the hub of a Friction Pair during operation is studied. It is accepted that near the rough Friction surface, the hub has a rectilinear crack. A criterion and a method for solving the inverse problem of the mechanics of contact fracture on definition of the function of displacements of external contour points of the hub of a Friction Pair with regard to temperature drop and inequalities of the contact surface in Friction Pair components is given. The found function of displacements of the external contour points of the hub provides an increase of the load-bearing capacity of the hub of a Friction Pair. The problem of prevention of the fracture of the hub of a Friction Pair with allowance for the real Friction surface was first posed and then solved.
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Minimization of Stress State of a Hub of Friction Pair
Hindawi Limited, 2018Co-Authors: Vagif M. Mirsalimov, Parvana E. AkhundovaAbstract:The function of displacements of external contour points of a Friction Pair hub that could provide minimization of stress state of a hub was determined on the basis of minimax criterion. The problem is to decrease stress state at that place where it is important. The rough Friction surface model is used. To solve a problem of optimal design of Friction unit the closed system of algebraic equations is constructed. Increase of serviceability of Friction Pair parts may be controlled by design-engineering methods, in particular by geometry of triboconjugation elements. Minimization of maximum circumferential stress on contact surface of Friction unit is of great importance in the design stage for increasing the serviceability of Friction Pair. The obtained function of displacements of the hub’s external contour points provides the serviceability of Friction Pair elements. The calculation of Friction Pair for oil-well sucker-rod pumps is considered as an example
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Minimization of the thermal state of the hub of a Friction Pair
Engineering Optimization, 2017Co-Authors: Vagif M. Mirsalimov, Parvana E. AkhundovaAbstract:ABSTRACTTheoretical analysis for defining the function of displacements of a hub’s external contour points and the microgeometry of the Friction surface, ensuring minimization of the thermal state of the hub of a Friction Pair, is performed based on the model of rough Friction surfaces and minimax criterion. A closed system of algebraic equations is constructed, allowing the solution to the problem of the optimal design of the Friction Pair to be obtained, depending on geometric and thermophysical characteristics of the hub and plunger. The resulting functions of displacements of the hub’s external contour points and microgeometry of the Friction surface ensure the increased serviceability of the Friction Pair.
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Inverse problems of damage mechanics for a hub of a Friction Pair
International Journal of Damage Mechanics, 2016Co-Authors: Vagif M. Mirsalimov, Parvana E. AkhundovaAbstract:We consider a problem of fracture mechanics for a hub of a Friction Pair during operation. It is assumed that near the Friction surface the hub has a rectilinear crack of length 2l1. A criterion and a method for solving the inverse problem of fracture mechanics on definition of the function of displacements of external contour points of the hub of a Friction Pair with regard to temperature drop in the details of Friction Pair is given. The found function of displacements of external contacts points of the hub provides increase of load-carrying capacity of the Friction Pair. Calculation for a Friction Pair applied to the borehole sucker-rod oil pumps was considered as an example.
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minimization of contact pressure for hub shaft Friction Pair
Journal of Friction and Wear, 2015Co-Authors: Vagif M. Mirsalimov, Parvana E. AkhundovaAbstract:Based on the minimax criterion, the theoretical definition of displacement function for hub external contour points, providing the minimization of contact pressure in the hub—shaft Friction Pair, has been executed. A closed system of algebraic equations has been constructed. The obtained system allows minimizing the contact pressure distribution in Friction Pair depending on the geometrical and mechanical characteristics of its elements.
