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Satish C Sharma - One of the best experts on this subject based on the ideXlab platform.
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influence of textured surface on the performance of non recessed hybrid Journal Bearing operating with non newtonian lubricant
Tribology International, 2016Co-Authors: Chandra B Khatri, Satish C SharmaAbstract:Abstract In the present work, a comparative study between textured surface and non-textured surface non-recessed hybrid Journal Bearing configurations is presented. To obtain the performance characteristics parameters of non-recessed hybrid Journal Bearing, the Reynolds equation, which governs the flow of lubricant in the clearance space, is solved using FEM and the performance parameters are computed. The shear stress–strain relation of lubricant is modeled with the help of a power-law fluid model. The numerically simulated results show that the textured non-recessed hybrid Journal Bearing provides improved stability parameter than that of Journal Bearing with non-texturing.
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performance of a noncircular 2 lobe multirecess hydrostatic Journal Bearing with wear
Industrial Lubrication and Tribology, 2012Co-Authors: Satish C Sharma, Vikas M Phalle, S C JainAbstract:Purpose – Noncircular Journal Bearings are used in industry because of their simplicity, efficiency and low cost. During the life time of a machine, these are required to be operated over a number of years and are submitted to several stops and starts. As a result, the bush becomes progressively worn out and the Bearing performance changes. The purpose of this paper is to study theoretically the influence of wear on the performance of a non‐circular 2‐lobe four‐pocket multirecess hybrid Journal Bearing system.Design/methodology/approach – The Reynolds equation governing the flow of lubricant in the clearance space of a non‐circular 2‐lobe multirecess worn hybrid Journal Bearing system has been solved using FEM along with appropriate boundary conditions. The defects caused by wear are centered on the load line and range from 10 per cent to 50 per cent of the Bearing radial clearance.Findings – The numerically simulated results based on a Newtonian lubricant and the steady state flow field system have been ...
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performance analysis of a multirecess capillary compensated conical hydrostatic Journal Bearing
Tribology International, 2011Co-Authors: Satish C Sharma, Vikas M Phalle, S C JainAbstract:Abstract The present paper is aimed to study theoretically the performance of a 4-pocket hydrostatic conical Journal Bearing system. The Reynolds equation governing the flow of lubricant in the clearance space of Bearing has been solved using FEM. The Bearing static and dynamic performance characteristics have been presented for the values of external load W¯ r =0.1–1.0 and for the semi cone angles ( γ =10°, 20°, 30° and 40°). The numerically simulated results indicate that the lubricant flow rate is significantly reduced in case of conical Journal Bearing vis a vis the corresponding similar circular hydrostatic Journal Bearing.
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influence of wear on the performance of a 2 lobe multirecess hybrid Journal Bearing system compensated with membrane restrictor
Tribology International, 2011Co-Authors: Vikas M Phalle, Satish C Sharma, S C JainAbstract:Abstract In the present paper, an analytical study concerning the influence of wear on the performance of a membrane compensated 2-lobe four-pocket hybrid Journal Bearing system has been presented. The modified Reynolds equation governing the flow of lubricant in the clearance space of a Journal Bearing system was solved using FEM and Newton–Raphson method. The numerically simulated results clearly indicates that the performance of the Bearing is greatly affected by wear. A judicious selection of parameters such as δ, δ ¯ w and C ¯ m may provide better Bearing performance.
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performance of membrane compensated multirecess hydrostatic hybrid flexible Journal Bearing system considering various recess shapes
Tribology International, 2004Co-Authors: Narendra Singh, Satish C Sharma, S C Jain, Sanjeeva S ReddyAbstract:The paper describes a theoretical study concerning the performance of an externally pressurized multirecess hydrostatic/hybrid flexible Journal Bearing system by varying the geometric shape of recess and using the membrane flow valve restrictor as a compensating element. The four different recess geometries of the Bearing studied in the present study are a square recessed Bearing, a circular recessed Bearing, an elliptical recessed Bearing and a triangular recessed Bearing. The equation governing the flow of lubricant in a Journal Bearing together with 3D elasticity equation and restrictor flow equation are solved by using the Finite Element Method. The study describes the effect of recess shape, Bearing flexibility and a method of compensation on the performance characteristics of a hydrostatic/hybrid Journal Bearing system. A comparative performance of the membrane compensated hydrostatic/hybrid Journal Bearing system has also been studied vis-a-vis capillary, orifice and constant flow valve restrictors. The results presented in this study amply demonstrate that the shape of recess/pocket of a hydrostatic/hybrid flexible Journal Bearing system affects the performance of the Bearing quite appreciably and a proper selection of recess shape along with a suitable compensating device is needed to get an improved performance from the Bearing.
S C Jain - One of the best experts on this subject based on the ideXlab platform.
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performance of a noncircular 2 lobe multirecess hydrostatic Journal Bearing with wear
Industrial Lubrication and Tribology, 2012Co-Authors: Satish C Sharma, Vikas M Phalle, S C JainAbstract:Purpose – Noncircular Journal Bearings are used in industry because of their simplicity, efficiency and low cost. During the life time of a machine, these are required to be operated over a number of years and are submitted to several stops and starts. As a result, the bush becomes progressively worn out and the Bearing performance changes. The purpose of this paper is to study theoretically the influence of wear on the performance of a non‐circular 2‐lobe four‐pocket multirecess hybrid Journal Bearing system.Design/methodology/approach – The Reynolds equation governing the flow of lubricant in the clearance space of a non‐circular 2‐lobe multirecess worn hybrid Journal Bearing system has been solved using FEM along with appropriate boundary conditions. The defects caused by wear are centered on the load line and range from 10 per cent to 50 per cent of the Bearing radial clearance.Findings – The numerically simulated results based on a Newtonian lubricant and the steady state flow field system have been ...
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performance analysis of a multirecess capillary compensated conical hydrostatic Journal Bearing
Tribology International, 2011Co-Authors: Satish C Sharma, Vikas M Phalle, S C JainAbstract:Abstract The present paper is aimed to study theoretically the performance of a 4-pocket hydrostatic conical Journal Bearing system. The Reynolds equation governing the flow of lubricant in the clearance space of Bearing has been solved using FEM. The Bearing static and dynamic performance characteristics have been presented for the values of external load W¯ r =0.1–1.0 and for the semi cone angles ( γ =10°, 20°, 30° and 40°). The numerically simulated results indicate that the lubricant flow rate is significantly reduced in case of conical Journal Bearing vis a vis the corresponding similar circular hydrostatic Journal Bearing.
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influence of wear on the performance of a 2 lobe multirecess hybrid Journal Bearing system compensated with membrane restrictor
Tribology International, 2011Co-Authors: Vikas M Phalle, Satish C Sharma, S C JainAbstract:Abstract In the present paper, an analytical study concerning the influence of wear on the performance of a membrane compensated 2-lobe four-pocket hybrid Journal Bearing system has been presented. The modified Reynolds equation governing the flow of lubricant in the clearance space of a Journal Bearing system was solved using FEM and Newton–Raphson method. The numerically simulated results clearly indicates that the performance of the Bearing is greatly affected by wear. A judicious selection of parameters such as δ, δ ¯ w and C ¯ m may provide better Bearing performance.
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performance of membrane compensated multirecess hydrostatic hybrid flexible Journal Bearing system considering various recess shapes
Tribology International, 2004Co-Authors: Narendra Singh, Satish C Sharma, S C Jain, Sanjeeva S ReddyAbstract:The paper describes a theoretical study concerning the performance of an externally pressurized multirecess hydrostatic/hybrid flexible Journal Bearing system by varying the geometric shape of recess and using the membrane flow valve restrictor as a compensating element. The four different recess geometries of the Bearing studied in the present study are a square recessed Bearing, a circular recessed Bearing, an elliptical recessed Bearing and a triangular recessed Bearing. The equation governing the flow of lubricant in a Journal Bearing together with 3D elasticity equation and restrictor flow equation are solved by using the Finite Element Method. The study describes the effect of recess shape, Bearing flexibility and a method of compensation on the performance characteristics of a hydrostatic/hybrid Journal Bearing system. A comparative performance of the membrane compensated hydrostatic/hybrid Journal Bearing system has also been studied vis-a-vis capillary, orifice and constant flow valve restrictors. The results presented in this study amply demonstrate that the shape of recess/pocket of a hydrostatic/hybrid flexible Journal Bearing system affects the performance of the Bearing quite appreciably and a proper selection of recess shape along with a suitable compensating device is needed to get an improved performance from the Bearing.
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study of hole entry hybrid Journal Bearing system considering combined influence of thermal and elastic effects
Tribology International, 2003Co-Authors: Satish C Sharma, Vijay Kumar, S C Jain, T NagarajuAbstract:Abstract A theoretical model is developed to study the performance of a hole-entry hybrid Journal Bearing system by considering variation of viscosity due to temperature rise of the lubricant in the analysis. The deformation of bush due to fluid-film pressure and temperature has been considered to establish the modified fluid-film profile. The Journal temperature is computed on the basis of the fluid-film temperature. The relevant governing equations have been solved using the finite element method and a suitable iterative technique. The thermoelastohydrostatic performance of an orifice compensated symmetric and asymmetric hole-entry hybrid Journal Bearing configurations has been studied for the chosen Bearing operating and geometric parameters. The results presented in the study indicate that the variation of viscosity due to temperature rise of the lubricant fluid-film have a quite appreciable influence on the static and dynamic performance of a hole-entry hybrid Journal Bearing system.
Vikas M Phalle - One of the best experts on this subject based on the ideXlab platform.
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performance of a noncircular 2 lobe multirecess hydrostatic Journal Bearing with wear
Industrial Lubrication and Tribology, 2012Co-Authors: Satish C Sharma, Vikas M Phalle, S C JainAbstract:Purpose – Noncircular Journal Bearings are used in industry because of their simplicity, efficiency and low cost. During the life time of a machine, these are required to be operated over a number of years and are submitted to several stops and starts. As a result, the bush becomes progressively worn out and the Bearing performance changes. The purpose of this paper is to study theoretically the influence of wear on the performance of a non‐circular 2‐lobe four‐pocket multirecess hybrid Journal Bearing system.Design/methodology/approach – The Reynolds equation governing the flow of lubricant in the clearance space of a non‐circular 2‐lobe multirecess worn hybrid Journal Bearing system has been solved using FEM along with appropriate boundary conditions. The defects caused by wear are centered on the load line and range from 10 per cent to 50 per cent of the Bearing radial clearance.Findings – The numerically simulated results based on a Newtonian lubricant and the steady state flow field system have been ...
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performance analysis of a multirecess capillary compensated conical hydrostatic Journal Bearing
Tribology International, 2011Co-Authors: Satish C Sharma, Vikas M Phalle, S C JainAbstract:Abstract The present paper is aimed to study theoretically the performance of a 4-pocket hydrostatic conical Journal Bearing system. The Reynolds equation governing the flow of lubricant in the clearance space of Bearing has been solved using FEM. The Bearing static and dynamic performance characteristics have been presented for the values of external load W¯ r =0.1–1.0 and for the semi cone angles ( γ =10°, 20°, 30° and 40°). The numerically simulated results indicate that the lubricant flow rate is significantly reduced in case of conical Journal Bearing vis a vis the corresponding similar circular hydrostatic Journal Bearing.
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influence of wear on the performance of a 2 lobe multirecess hybrid Journal Bearing system compensated with membrane restrictor
Tribology International, 2011Co-Authors: Vikas M Phalle, Satish C Sharma, S C JainAbstract:Abstract In the present paper, an analytical study concerning the influence of wear on the performance of a membrane compensated 2-lobe four-pocket hybrid Journal Bearing system has been presented. The modified Reynolds equation governing the flow of lubricant in the clearance space of a Journal Bearing system was solved using FEM and Newton–Raphson method. The numerically simulated results clearly indicates that the performance of the Bearing is greatly affected by wear. A judicious selection of parameters such as δ, δ ¯ w and C ¯ m may provide better Bearing performance.
Fakhruldin Mohd Hashim - One of the best experts on this subject based on the ideXlab platform.
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analysis of couple stress fluid lubricated partially textured slip slider and Journal Bearing using narrow groove theory
Tribology International, 2014Co-Authors: Ahmad Majdi Abdul Rani, T Nagarajan, Fakhruldin Mohd HashimAbstract:Abstract A theoretical model of partially textured slip slider and Journal Bearing lubricated with couple stress fluids is developed using narrow groove theory (NGT). The partially textured slip Bearing configuration is analyzed using couple stress effects. The nondimensional pressure and shear stress expressions are derived based on one-dimensional analysis using modified Reynolds equation. The partially textured slip parameters used in the analysis are: nondimensional texture length; nondimensional depth of recess; land with slip to recess region ratio; and nondimensional slip coefficient. Partially textured slip is effective in the case of parallel slider and concentric Journal Bearing lubricated with couple stress fluids to yield an improvement in load capacity and reduction in coefficient of friction.
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analysis of Journal Bearing with double layer porous lubricant film influence of surface porous layer configuration
Tribology Transactions, 2013Co-Authors: T V V L N Rao, Ahmad Majdi Abdul Rani, T Nagarajan, Fakhruldin Mohd HashimAbstract:This article presents an analysis of a long Journal Bearing with a double-layer porous lubricant film using couple stress and Newtonian fluids. The porous layer with infinite permeability analyzed in this study simulates the surface layer. The Brinkman model was utilized to model the flow in the porous region. The effects of couple stresses were analyzed based on Stokes microcontinuum theory. A double-layer porous lubricant film configuration, with a low-permeability porous layer on top of a high-permeability Bearing adherent porous layer, improved the Journal Bearing performance characteristics. A surface porous layered lubricant film configuration increased the load-carrying capacity and reduced the coefficient of friction in a Journal Bearing.
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analysis of slider and Journal Bearing using partially textured slip surface
Tribology International, 2012Co-Authors: Ahmad Majdi Abdul Rani, T Nagarajan, Fakhruldin Mohd HashimAbstract:Abstract The present study evaluates the effects of texture/slip configuration on improvement in load capacity and reduction in coefficient of friction for partially textured slip slider and Journal Bearing. The nondimensional pressure and shear stress expressions are derived from one dimensional analysis of modified classical Reynolds equation. The texture/slip parameters used in the analysis are: nondimensional texture length; nondimensional depth of recess/groove; land with slip to recess region ratio; number of cells; and nondimensional slip coefficient. Partially textured slip parallel slider and concentric Journal Bearing has a potential to generate load carrying capacity and reduce coefficient of friction.
G Gurubasavaraj - One of the best experts on this subject based on the ideXlab platform.
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surface roughness effects in a short porous Journal Bearing with a couple stress fluid
Fluid Dynamics Research, 2002Co-Authors: N B Naduvinamani, P S Hiremath, G GurubasavarajAbstract:In this paper, a theoretical study of the effect of surface roughness in hydrodynamic lubrication of a porous Journal Bearing with couplestress fluid as lubricant is made. The modified Reynolds equations accounting for the couple stresses and randomized surface roughness structure are mathematically derived. The Christensen stochastic theory of hydrodynamic lubrication of rough surfaces is used to study the effects of surface roughness on the static characteristics of a short porous Journal Bearing with couplestress fluid as lubricant. Further, it is assumed that, the roughness asperity heights are small compared to the film thickness. It is observed that, the effects of surface roughness on the Bearing characteristics are more pronounced for couplestress fluids as compared to the Newtonian fluids.
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squeeze film lubrication of a short porous Journal Bearing with couple stress fluids
Tribology International, 2001Co-Authors: N B Naduvinamani, P S Hiremath, G GurubasavarajAbstract:This paper presents the theoretical investigations of the rheological effects of the couple stress fluids on the static and dynamic behaviour of the pure squeeze films in the porous Journal Bearings. The present study predicts the effects of percolation of the polar additives (microstructures) into the porous matrix on the performance of squeeze films in the porous Journal Bearings. The most general modified Reynolds-type equation is derived for a porous Journal Bearing with no Journal rotation. The analysis takes into account of the tangential velocity slip at the porous interface by using the BJ-slip condition. The cases of a short porous Journal Bearing under a constant applied load and that under an alternating load are analyzed. As compared to the Newtonian lubricants, the lubricants which sustain the couple stresses yield an increase in the load carrying capacity. Under a cyclic load the couple stress fluids provide a reduction in the Journal velocity and an increase in the minimum permissible height of squeeze films.
