Title: Error correction in hydrostatic spindles by optimal bearing tuning

Authors: M. Aleyaasin, R. Whalley, M. Ebrahimi

Addresses: Department of Mechanical and Medical Engineering, University of Bradford, W. Yorkshire BD7 1DP, UK. Department of Mechanical and Medical Engineering, University of Bradford, W. Yorkshire BD7 1DP, UK. Department of Mechanical and Medical Engineering, University of Bradford, W. Yorkshire BD7 1DP, UK

Abstract: In this paper, a high precision grinding wheel is considered as a rigid rotor mounted on two hydrostatic bearings. The equations for small perturbations of the wheel on the bearings are derived in the form of a multi-input, multi-output transfer function matrix, enabling the frequency response function of the wheel to be determined. Using direct search optimisation methods, the optimal stiffness and damping of the bearings is computed. The dynamic characteristics of the bearings, tuned for minimum radial displacement of the spindle, is achieved, maximising thereby the accuracy of the grinding process. Simulation results show that by stiffness coarse adjustment and fine adjustment of the damping in the bearings, a spindle with 35 µm manufacturing error, can produce components with 3 µm accuracy.

Keywords: error; spindle; hydrostatic; optimisation; bearing; tuning.

DOI: 10.1504/IJCAT.2003.002122

International Journal of Computer Applications in Technology, 2003 Vol.17 No.4, pp.253-262

Available online: 13 Dec 2003 *

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