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Extra resources for Encyclopedia of Vibration, Volumes 1-3

Sample text

The inductive shunt or resonant circuit shunt presents a vibration suppression effect that is very similar to the classical dynamic vibration absorber. The classical DVA stores part of the kinetic energy of the primary ABSORBERS, VIBRATION 25 Figure 17 Frequency response of the primary system. Nomenclature Figure 18 Scheme of a resonant circuit shunt used for vibration attenuation. system, while the resonant circuit shunt is designed to dissipate the electrical energy that has been converted from mechanical energy by the piezoelectric.

This means that the mass ratio, defined as m ˆ ma amp should be kept as small as possible (values of m up to 5 percent are generally acceptable). However, eqns [6b] and [7] state that small values of the secondary mass correspond to small values of the DVA stiffness and high amplitude of vibration of the secondary mass. This last fact has direct implication in the fatigue life of the resilient element of the DVA. In many circumstances the interest is to reduce the amplitude of vibration of the primary system in the vicinity of its resonance frequency.

They act simultaneously with the hazardous excitation to provide enhanced structural behavior for improved service and safety. Remarkable progress has been made over the last 20 years. As will be discussed in the following sections, research to date has reached the stage where active systems have been installed in full-scale structures. , lifelines, roofs) where no other means can provide adequate protection. The purpose of this article is to provide an assessment of the state-of-the-art and state-of-the-practice of this exciting, and still evolving, technology.

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