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RESEARCH PAPERS

Design of Irregular Slider Surface for Satisfying Specified Load Demands

[+] Author and Article Information
Chin-Hsiang Cheng1

Department of Mechanical Engineering,  Tatung University, 40 Chungshan N. Road, Sec. 3, Taipei, Taiwan 10451, R.O.Ccheng@ttu.edu.tw

Mei-Hsia Chang

Department of Mechanical Engineering,  Tatung University, 40 Chungshan N. Road, Sec. 3, Taipei, Taiwan 10451, R.O.C

1

Corresponding author.

J. Mech. Des 127(6), 1184-1190 (Oct 26, 2004) (7 pages) doi:10.1115/1.2049069 History: Received April 15, 2004; Revised October 26, 2004

This study is to design the surfaces of sliders to meet the pressure distribution specified by the designers. The slider surfaces, in general, characterize an irregular profile. A direct problem solver, which is able to provide solutions for pressure distribution in the air film between the slider and the moving surface for various geometric conditions, is incorporated with an inverse method for determination of slider surface shape. In this report, a point-by-point design method is developed to improve the polynomial-function approach proposed in an earlier study (Cheng and Chang, 2004, J. of Tribology126, pp. 519-526.) An exact solution for the two-dimensional design problems has also been developed to partly confirm the present approach. Results obtained from the present approaches are demonstrated by a comparison with the data from the existing method and the exact solutions to display the relative performance of the present method. The desired slider-shape design is a function of the bearing numbers. The slider shapes associated with different combinations of bearing numbers are investigated.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

Physical model of a slider bearing

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Figure 2

Comparison between the point-by-point designed slider shape and the exact solution from Eq. 10 for a two-dimensional design problem at Λx=500

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Figure 3

Results of shape design by using polynomial-function method (9) and the present point-by-point method, for a shape that can be approximated by a polynomial function, at Λx=1500 and Λy=2000: (a) exact, (b) polynomial-function method (9), and (c) present point-by-point method

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Figure 4

Results of shape design by using polynomial-function method (9) and the present point-by-point method, for an irregular shape, at Λx=3000 and Λy=1000: (a) exact, (b) polynomial-function method (9), and (c) present point-by-point method

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Figure 5

Pressure distribution yielded by the polynomial-function (9) and the present point-by-point method, for an irregular shape, at Λx=3000 and Λy=1000

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Figure 6

Slider-shape designs at the same specified pressure distribution under various bearing number combinations. The specified pressure distribution is plotted in the central portion. (a) Λx=3000, Λy=1000; (b) Λx=3000, Λy=3000; and (c) Λx=3000, Λy=6000.

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Figure 7

Iteration process of shape design for the case considered in Fig. 6

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