Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
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Robust Control of Maglev Vehicles with Multimagnets Using Separate Control Techniques

  • Published : 2001.09.01
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Abstract

A robust control design scheme using well-developed SISO techniques is proposed for maglev vehicles that are inherently unstable MIMO systems. The proposed separate control method has basically two control loops: a stabilizing loop by a pole-placement technique, and a performance loop using a novel optimal LQ loop-shaping technique. This paper shows that the coupling terms involved in maglev vehicles with multimagnets should not be neglected but compensated for their stability and performance robustness. The robustness properties of the proposed control system are then evaluated under variations of vehicle masses and air gaps through a computer simulation. This paper also describes the reason why the proposed control technique can be suggested as a tool using only SISO techniques in controlling unstable MIMO systems such as maglev vehicles.

Keywords

References

  1. Bryson, A. E. Ho, Y. C., 1975, Applied Optimal Control, Hemisphere Pub. Co.
  2. Doyle, J. C. Stein, G., 1981, 'Multivariable Feedback Design: Concepts for a Classical/Modern Synthesis,' IEEE Trans. on AC. Vol. 26, pp. 4-16.
  3. Fabien, B. C., 1993, 'Controller Gain Selection for an Electromagnetic Suspension Under Random Excitation,' ASME J. of Dyn. Sys. Meas,. and Control, Vol. 115, pp. 156-165.
  4. Kim, J. S., 1987, 'Nonlinear Multivariable Control Using Statistical Linearization and Loop Transfer Recovery,' Ph. D. Thesis, Dept of Mech. Eng., MIT.
  5. Fallside, F., 1997, Control System Design by Pole-Zero Assignment, Academic Press.
  6. Lehtomaki, N. A., 1981, 'Practical Robustness Measures in Multivariable Control System Analysis,' Ph. D. Thesis, Dept. of EECS, MIT.
  7. Limbert, D. A., Richardson, H. H., and Wormley, D. N., 1979, 'Controlled Dynamic Characteristics of Ferromagnetic Vehicle Suspension Providing Simultaneous Lift and Guidance,' J. of Dyn. Sys. Meas. and Control, pp. 217-222
  8. Kim, J. S. and Park, J. S., 1991, 'Bond Graph Modeling and LQG/LTR Controller Design of Magnetically Levitation Systems,' Trans. of KSME, Vol. 15. pp. 1620-1634.
  9. MacLeod, C.and Goodall, R. M., 'Frequency-Shaping LQ Control of Maglev Suspension Systems for Optimal Performance with Deterministic and Stochastic Inputs,' IEEE Proc. on Control Theroy Appl., Vol. 143, pp. 25-30. https://doi.org/10.1049/ip-cta:19960057
  10. Sinha, P. K., 1987. Electromagnetic Suspension: Dynamic and Control, Peter Peregrinus Ltd.