The Experts below are selected from a list of 17655 Experts worldwide ranked by ideXlab platform

S C Jain - One of the best experts on this subject based on the ideXlab platform.

  • performance of membrane compensated multirecess hydrostatic hybrid flexible journal bearing system considering various recess shapes
    Tribology International, 2004
    Co-Authors: Narendra Singh, Satish C. Sharma, S C Jain, Sanjeeva S Reddy
    Abstract:

    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.

  • performance characteristics of multirecess hydrostatic hybrid flexible journal bearing with membrane type variable flow restrictor as compensating elements
    Wear, 1992
    Co-Authors: Satish C. Sharma, R. Sinhasan, S C Jain
    Abstract:

    Abstract The effect of bearing shell deformation on the performance characteristics of a four-pocket hydrostatic journal bearing system using membrane type variable-flow restrictors as compensating elements is studied theoretically. The finite-element method has been used to obtain simultaneous solutions of the three-dimensional Elasticity Equation and the Reynolds Equation. The performance characteristics of the bearing have been studied for a wide range of values of the operating load, deformation coefficient and for both hydrostatic and hybrid modes of operation. An example is given to highlight the significance of the study presented in the paper.

Satish C. Sharma - One of the best experts on this subject based on the ideXlab platform.

  • performance of membrane compensated multirecess hydrostatic hybrid flexible journal bearing system considering various recess shapes
    Tribology International, 2004
    Co-Authors: Narendra Singh, Satish C. Sharma, S C Jain, Sanjeeva S Reddy
    Abstract:

    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.

  • performance characteristics of multirecess hydrostatic hybrid flexible journal bearing with membrane type variable flow restrictor as compensating elements
    Wear, 1992
    Co-Authors: Satish C. Sharma, R. Sinhasan, S C Jain
    Abstract:

    Abstract The effect of bearing shell deformation on the performance characteristics of a four-pocket hydrostatic journal bearing system using membrane type variable-flow restrictors as compensating elements is studied theoretically. The finite-element method has been used to obtain simultaneous solutions of the three-dimensional Elasticity Equation and the Reynolds Equation. The performance characteristics of the bearing have been studied for a wide range of values of the operating load, deformation coefficient and for both hydrostatic and hybrid modes of operation. An example is given to highlight the significance of the study presented in the paper.

Sanjeeva S Reddy - One of the best experts on this subject based on the ideXlab platform.

  • performance of membrane compensated multirecess hydrostatic hybrid flexible journal bearing system considering various recess shapes
    Tribology International, 2004
    Co-Authors: Narendra Singh, Satish C. Sharma, S C Jain, Sanjeeva S Reddy
    Abstract:

    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.

Narendra Singh - One of the best experts on this subject based on the ideXlab platform.

  • performance of membrane compensated multirecess hydrostatic hybrid flexible journal bearing system considering various recess shapes
    Tribology International, 2004
    Co-Authors: Narendra Singh, Satish C. Sharma, S C Jain, Sanjeeva S Reddy
    Abstract:

    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.

Kamran Mohseni - One of the best experts on this subject based on the ideXlab platform.

  • an arbitrary lagrangian eulerian formulation for the numerical simulation of flow patterns generated by the hydromedusa textit aequorea victoria
    arXiv: Fluid Dynamics, 2010
    Co-Authors: Mehmet Sahin, Kamran Mohseni
    Abstract:

    A new geometrically conservative arbitrary Lagrangian-Eulerian (ALE) formulation is presented for the moving boundary problems in the swirl-free cylindrical coordinates. The governing Equations are multiplied with the radial distance and integrated over arbitrary moving Lagrangian-Eulerian quadrilateral elements. Therefore, the continuity and the geometric conservation Equations take very simple form similar to those of the Cartesian coordinates. The continuity Equation is satisfied exactly within each element and a special attention is given to satisfy the geometric conservation law (GCL) at the discrete level. The Equation of motion of a deforming body is solved in addition to the Navier-Stokes Equations in a fully-coupled form. The mesh deformation is achieved by solving the linear Elasticity Equation at each time level while avoiding remeshing in order to enhance numerical robustness. The resulting algebraic linear systems are solved using an ILU(k) preconditioned GMRES method provided by the PETSc library. The present ALE method is validated for the steady and oscillatory flow around a sphere in a cylindrical tube and applied to the investigation of the flow patterns around a free-swimming hydromedusa \textit{Aequorea victoria} (crystal jellyfish). The calculations for the hydromedusa indicate the shed of the opposite signed vortex rings very close to each other and the formation of large induced velocities along the line of interaction while the ring vortices moving away from the hydromedusa. In addition, the propulsion efficiency of the free-swimming hydromedusa is computed and its value is compared with values from the literature for several other species. The fluid dynamics video presented here shows the time variation of the instantaneous three-dimensional vorticity isosurfaces around a free-swimming hydromedusa \textit{Aequorea victoria}.

  • an arbitrary lagrangian eulerian formulation for the numerical simulation of flow patterns generated by the hydromedusa aequorea victoria
    Journal of Computational Physics, 2009
    Co-Authors: Mehmet Sahin, Kamran Mohseni
    Abstract:

    A new geometrically conservative arbitrary Lagrangian-Eulerian (ALE) formulation is presented for the moving boundary problems in the swirl-free cylindrical coordinates. The governing Equations are multiplied with the radial distance and integrated over arbitrary moving Lagrangian-Eulerian quadrilateral elements. Therefore, the continuity and the geometric conservation Equations take very simple form similar to those of the Cartesian coordinates. The continuity Equation is satisfied exactly within each element and a special attention is given to satisfy the geometric conservation law (GCL) at the discrete level. The Equation of motion of a deforming body is solved in addition to the Navier-Stokes Equations in a fully-coupled form. The mesh deformation is achieved by solving the linear Elasticity Equation at each time level while avoiding remeshing in order to enhance numerical robustness. The resulting algebraic linear systems are solved using an ILU(k) preconditioned GMRES method provided by the PETSc library. The present ALE method is validated for the steady and oscillatory flow around a sphere in a cylindrical tube and applied to the investigation of the flow patterns around a free-swimming hydromedusa Aequorea victoria (crystal jellyfish). The calculations for the hydromedusa indicate the shed of the opposite signed vortex rings very close to each other and the formation of large induced velocities along the line of interaction while the ring vortices moving away from the hydromedusa. In addition, the propulsion efficiency of the free-swimming hydromedusa is computed and its value is compared with values from the literature for several other species.