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Juan Shi

Works: 1 works in 1 publications in 1 language and 1 library holdings
Roles: Author
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Most widely held works by Juan Shi
Design and Implementation of Conventional and Advanced Controllers for Magnetic Bearing System Stabilization by Juan Shi( Book )

1 edition published in 2010 in English and held by 1 WorldCat member library worldwide

In this chapter, the controller structure and performance of a conventional controller and an analytical feedback controller have been compared with those of a fuzzy logic controller (FLC) when they are applied to the MBC500 magnetic bearing system stabilization problem. The conventional and the analytical feedback controller were designed on the basis of a reduced order model obtained from an identified 8th-order model of the MBC500 magnetic bearing system. Since there are resonant modes that can threaten the stability of the closedloop system, notch filters were employed to help secure stability. The FLC uses error and rate of change of error in the position of the rotor as inputs and produces an output voltage to control the current of the amplifier in the magnetic bearing system. Since a model is not required in this approach, this greatly simplified the design process. In addition, the FLC can stabilize the magnetic bearing system without the use of any notch filters. Despite the simplicity of FLC, experimental results have shown that it produces less steady-state error and has less overshoot than its model based counterpart. While the model based controllers are linear systems, it is not a surprise that their stability condition depends on the level of the disturbance. This is because the magnetic bearing system is a nonlinear system. However, although the FLC exhibits some of the common characteristics of high authority linear controllers (small steady-state error and amplification of measurement noise), it does not have the low stability robustness property usually associated with such high gain controllers that we would have expected. Future work will include finding some explanations for the above unusual observation on FLC. We believe the understanding achieved through attempting to address the above issue would lead to better controller design methods for active magnetic bearing systems
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Alternative Names
Juan, Shi

Shi, J.