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Sensitivity of Optimum Design of Rotor System With Magnetic Bearing Via Multilevel Technique

[+] Author Affiliations
T. N. Shiau, M. D. Wu

National Chung Cheng University, Chia Yi, Taiwan, R.O.C.

J. R. Chang

Nan-Jeon Institute of Technology, Tainan, Taiwan, R.O.C.

T. H. Yang

National Taiwan University of Science and Technology, Taipei, Taiwan, R.O.C.

Paper No. GT2002-30636, pp. 1153-1174; 22 pages
doi:10.1115/GT2002-30636
From:
  • ASME Turbo Expo 2002: Power for Land, Sea, and Air
  • Volume 4: Turbo Expo 2002, Parts A and B
  • Amsterdam, The Netherlands, June 3–6, 2002
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-3609-6 | eISBN: 0-7918-3601-0

abstract

There are many nonlinear factors in the optimization process. The objective of this study is to determine some effects of these nonlinear factors on the sensitivity of optimum design. A rotor-bearing system is composed of rigid disks, shaft elements with distributed mass and stiffness, and magnetic bearings. To obtain an optimum design, the objectives including shaft weight and amplitude of shaft lateral response as well as the constraints including critical speeds and bending stresses are considered. The inner radii of shaft elements, the bias currents of magnetic bearings, and the axial positions of bearings and disks are chosen as the design variables. The single objective method, the multi-objective method and the multilevel technique are employed to deal with the problem of optimality. Optimum results obtained by applying these methods are compared and discussed in this study. Finally, the sensitivity of optimum design is analyzed to determine what nonlinear effects the position of magnetic bearings have on different initial designs.

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