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Proceedings Paper

Optimized switching algorithm for synchronized switch damping for multimodal excitation
Author(s): Sebastian M. Schwarzendahl; Xu Han; Marcus Neubauer; Jörg Wallaschek
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Paper Abstract

Shunted piezoceramics can be used to dissipate vibration energy of a host structure and therefore reduce vibration amplitudes. The piezoceramic converts a portion of the mechanical energy into electric energy which is then dissipated in an electric network. One semi-active control technique is the synchronized switch damping on inductance (SSDI), which has a good damping performance and can adapt to a wide range of excitation frequencies. In the standard SSDI a switch is closed during maximum deformation for one half of the electrical period time. This results in an inversion of the electrical charge. For the rest of the half-period the switch is opened and the charge remains constant. This results in a nearly rectangular voltage signal, which is in antiphase with the deformation velocity. In case of multimodal excitation, more sophisticated switching laws are developed with the aim to extract vibration energy from higher modes (i.e. Richard). This paper describes a novel multimodal switching law for vibration damping. An observer is designed to obtain an estimation of the first two vibration modes, which are used to determine the switching times. In simulations the increase in energy dissipation is evaluated and compared to the standard SSDI technique. With the new switching algorithm an improvement in energy dissipation is observed. The theoretical results are validated by measurements carried out on a clamped-free beam. The location of the piezoceramics is chosen to optimize the electro-mechanical coupling with the first vibration mode of the beam. The modal observer is realized in a realtime environment. Measurements show a good agreement with the theoretical results.

Paper Details

Date Published: 9 April 2010
PDF: 9 pages
Proc. SPIE 7643, Active and Passive Smart Structures and Integrated Systems 2010, 764303 (9 April 2010); doi: 10.1117/12.847300
Show Author Affiliations
Sebastian M. Schwarzendahl, Leibniz Univ. Hannover (Germany)
Xu Han, Leibniz Univ. Hannover (Germany)
Marcus Neubauer, Leibniz Univ. Hannover (Germany)
Jörg Wallaschek, Leibniz Univ. Hannover (Germany)

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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