• Transactions of the Korean Society of Mechanical Engineers
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• v.12 no.5
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• pp.1016-1025
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• 1988

A force cancelling observed to control the vibration of a single degree of freedom elastic system subjected to an arbitrary, unmeasurable disturbance is considered in this paper. The main idea of a force cancelling observer is how an estimate of the excitation can be derived and used to generate a control force which reduces the vibration. This control is shown to be robust with respect to the parameters describing the behavior of the system. Experimental and numerical results are presented which show the efficacy of the observer when the system is excited by periodic, random, and impulsive torques.