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Implementation of an Adaptive R-L Shunt Circuit in Analog Technology


D. Niederberger, M. Morari, Stan Pietrzko

vol. AUT03-16

This report presents the design and implementation of an adaptive R-L shunt with analog circuit components for mechanical vibration suppression. R-L shunts can suppress vibration in a very efficient way, but they are very sensitive to environmental variations and thus their damping performance can decrease. In the past, some adaptation methodologies have been proposed, but the realizations of them are difficult. Either digital signal processors or even motorized potentiometers to vary a virtual inductor have been suggested. We will present a very simple circuit that consists only of analog circuitry. The variable inductor was realized with a virtual inductor and a Junction Field Effect Transistor (JFET) in feedback configuration. The adaptation to tune the shunt was implemented with some simple filters, an analog multiplier and an integrator. In simulations and experiments, this new circuit is validated. It turned out that the circuit tunes very fast and converges well. Furthermore, it is shown that the whole circuit can be implemented on a small chip and it can be extended for multi-mode shunt damping.


Type of Publication:

(04)Technical Report

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% Autogenerated BibTeX entry
@TechReport { NieMor:2003:IFA_1003,
    author={D. Niederberger and M. Morari and Stan Pietrzko},
    title={{Implementation of an Adaptive R-L Shunt Circuit in Analog
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