Masakazu Migita

Bio: Masakazu Migita is an academic researcher. The author has contributed to research in topics: Fluid bearing & Finite element method. The author has an hindex of 1, co-authored 1 publications receiving 28 citations.

Application Bulletin of the JSME of Finite-Element Method to Hydrodynamic Lubrication Problems : Part 1, Infinite-Width Bearings

Abstract: Few papers which applied the finite-element method to hydrodynamic lubrication have been published, in spite of many literatures introducing the finite-element method in structural problems. In this paper, the applications of the finite-element method for hydrodynamic lubrication of infinite-width bearings are presented. It is claimed that the finite-element method is able to obtain the accurate results by using a few elements. The finite-element solution is compared with an exact solution and a finite-difference solution of step bearings, plane slider learnings and journal bearings.

Performance Characteristics of Noncircular Bearings in Laminar and Turbulent Flow Regimes

Abstract: Using linearized turbulent lubrication theory of Ng and Pan, the modified Reynolds equation has been solved by finite element method using Galerkin's technique. Static and dynamic performance characteristics of the noncircular (two-lobe) bearings have been studied, both for laminar and turbulent flow, in terms of load support, oil flow, fluid film stiffness coefficients, damping coefficients, and critical mass for various Reynolds numbers.

An Evaluation of Finite Difference and Finite Element Methods for the Solution of the Reynolds Equation

Abstract: A comparative study is made of various finite difference and finite element solutions of the Reynolds equation for the steady, isoviscous, incompressible hydrodynamic lubrication problem. Numerical solutions are obtained for both one- and two-dimensional slider bearings, and the predicted load capacity is evaluated against that of the corresponding exact analytical solution. Two finite difference schemes of nominal second-and fourth-order accuracy are employed. Linear, quadratic, and cubic elements are used in the finite element solutions. The different solution methods are evaluated in terms of accuracy, computational complexities and cost. Presented at the 40th Annual Meeting in Las Vegas, Nevada May 6–9, 1985

Elasto-hydrodynamic lubrication analysis of full 360 journal bearing using CFD and FSI techniques

Abstract: Conventional method of performing an EHL analysis on a bearing involves development of com- plex codes and simplification of actual physical model. This paper presents a methodology to model and sim- ulate the Overall Elasto-Hydrodynamic Lubrication of a full journal bearing using the sequential application of Computational Fluid Dynamics (CFD) and Computational Structural Dynamics (CSD). Here, the coupled field analysis uses the capabilities of commercially available Finite Element Software ANSYS/FLOTRAN incorporating the technique of Fluid Structure Interaction (FSI). The pressure field for a full journal bear- ing operating under laminar flow regime with various L/D ratios is obtained by CFD. Stress distribution and deformation in the bearing liner due to resulting pressure force is evaluated using FEM, satisfying the bound- ary conditions. The stress distribution indicates the critical points in the bearing structure. The results show reasonable agreement in general.

Application of finite element methods to thermohydrodynamic lubrication

Abstract: A finite element formulation is presented for the equations governing the steady thermohydrodynamic behaviour of liquid lubricated bearings. This formulation permits application of the iterative solution scheme to bearings of arbitrary geometry. A generalized Reynolds equation resulting from the combination of the mass and momentum conservation equations is cast into variational form and used to derive general finite element equations. The method of weighted residuals with Galerkin's criterion is used to generate finite element matrix equations for the thermal energy equation. In addition to the finite element formulation, a discussion of appropriate finite difference techniques is also given for problems without complex geometry. As an example, the formulations are applied to obtain numerical solutions for a three-dimensional sector thrust bearing operating in the thermohydrodynamic regime. Pressure, velocity and temperature distributions are give, and the thermohydrodynamic solutions are compared with the results of classical isothermal theory.