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most effective control strategy. Multi-mode PPF control targeting at the first two modes was tested and
achieved energy level drop in both modes simultaneously. Compared to SRF control, the PPF controller
will have most likely to become unstable due to the natural frequency change of the system. Research
work is currently being conducted using adaptive positive position feedback control Sliding mode control
in the research achieves energy level as much as those in the PPF control The main disadvantage of the
sliding mode control is the excitation of high modes and relatively large initial overshoot.
5. Acknowledgements
The first author would like to thank the support provided by NSF via a CAREER grant.
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