Direct Numerical Analysis of Slider using Optimization Scheme

P. Hwang and P. Khan (Korea)


steady state position, gas lubrication, optimization


The solution of the nonlinear Reynolds' equation, which describes the pressure distribution in the air film, is essential part of the numerical analysis of the slider. This time-consuming procedure must be done many times to determine the steady state position of the slider and it's dynamic behavior. Fukui and Kaneko [4] prepared the database, that can be used to decrease the time of the pressure calculation. The object of the present work is the numerical analysis of the computer hard disk slider. The pressure between slider and disk surfaces is calculated using the Boundary Fitted Coordinate System and Divergence Formulation for the nonlinear Reynolds' equation solution. The optimization scheme is applied to search of the steady state position of the slider. Methods of conjugate directions and feasible directions are applied. The Reynolds equation can be solved using different discretization methods, such as Finite Difference Method, Finite Element Method [5] or Divergence Formulation [6], which is also called Direct Numerical Method. FEM has some advantages for example a wide choice of possible mesh elements. Wu and Bogy [7] developed the method of the triangular mesh adaptation, that improves the pressure calculation. The DF enables modeling of the step-like slider surface. Kawabata [6] applied the Boundary Fitted Coordinate System to DF method to deal with complicated slider shapes.

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