Abstract
Abstract Piezo ceramic patches connected to electronic shunt circuits have formed successful vibration reduction devices. Here a new shunt circuit design with additional capacitors is presented. One drawback of existing electronic shunt circuits is the large inductance required when suppressing low frequency vibration. Also, the large internal resistance associated with this high inductance value exceeds the optimal design resistance needed for vibration suppression. To solve these problems, a modified and improved piezoelectric shunt circuit is designed by connecting additional capacitors in parallel. This design is experimentally demonstrated for a desired tuned mode of an aluminum beam. The results indicate that improved electronic passive damping can significantly reduce the structural vibration response with half of the inductance previously required.
Highlights
The passive electronic damping is becoming a viable alternative to vibration damping devices due to low cost, lightweight, and good performance
Comparisons are shown between the amplitudes of vibration when the shunt circuit is not activated and activated using different resistor values at a fixed room temperature
A technique that is capable of reducing the structure vibration amplitude using the electrical passive damper with a half, a quarter, or even onetenth the previously required inductance is introduced
Summary
The passive electronic damping is becoming a viable alternative to vibration damping devices due to low cost, lightweight, and good performance. The inductive shunt damper, which consists of an inductor and resistor, has been used as an effective damping device in many real applications. Forward [1] carried out a preliminary demonstration of the feasibility of using external electronic circuits to damp out mechanical vibrations in optical systems. Hagood and von Flotow [2] showed the analytical models of a resistive (R) and a resonant (LR) electrical shunted piezoelectric with the experimental verifications. Edberg et al [3] showed that a lightweight electronic circuit could replace the heavy commercial inductor. They showed the possibility of simultaneously dissipating two modes of vibration by using a piezoelectric material with a tuned shunt circuit. Wu [5] showed a piezo-
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