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Proceedings Paper

Application of a negative capacitance circuit in synchronized switch damping techniques for vibration suppression
Author(s): Hongli Ji; Jinhao Qiu; Jun Cheng; Daniel Inman
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Paper Abstract

In the synchronized switching damping (SSD) techniques, the voltage on the piezoelectric element is switched synchronously with the vibration to be controlled using an inductive shunt circuit (SSDI). The inherent capacitance and the inductance in the shunt circuit comprise an electrically resonant circuit. In this study a negative capacitance is used in the shunt circuit instead of an inductance in the traditional SSD technique. The voltage on the piezoelectric element can be effectively inverted though the equivalent circuit is capacitive and no resonance occurs. In order to investigate the principle of the new SSD method based on a negative capacitance (SSDNC), the variation of the voltage on the piezoelectric element and the current in the circuit is analyzed. Furthermore, the damping effect using the SSDNC is deduced, and the energy balance and stability of the new system are investigated analytically. The method is applied to the single mode control and two-mode control of a composite beam, and its control performance was confirmed by the experimental results. For the first mode in single mode control, the SSDNC is much more effective than SSDI. In other cases, the SSDNC is also more effective than the SSDI, although not significantly.

Paper Details

Date Published: 12 April 2010
PDF: 12 pages
Proc. SPIE 7643, Active and Passive Smart Structures and Integrated Systems 2010, 76432V (12 April 2010); doi: 10.1117/12.847078
Show Author Affiliations
Hongli Ji, Nanjing Univ. of Aeronautics and Astronautics (China)
Jinhao Qiu, Nanjing Univ. of Aeronautics and Astronautics (China)
Jun Cheng, Nanjing Univ. of Aeronautics and Astronautics (China)
Daniel Inman, Virginia Polytechnic Institute and State Univ. (United States)


Published in SPIE Proceedings Vol. 7643:
Active and Passive Smart Structures and Integrated Systems 2010
Mehrdad N. Ghasemi-Nejhad, Editor(s)

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