Optimized switching algorithm for synchronized switch damping for multimodal excitation

Sebastian M. Schwarzendahl; Xu Han; Marcus Neubauer; Jörg Wallaschek

doi:10.1117/12.847300

9 April 2010 Optimized switching algorithm for synchronized switch damping for multimodal excitation

Sebastian M. Schwarzendahl, Xu Han, Marcus Neubauer, Jörg Wallaschek

Proceedings Volume 7643, Active and Passive Smart Structures and Integrated Systems 2010; 764303 (2010) https://doi.org/10.1117/12.847300
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2010, San Diego, California, United States

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.

Citation Download Citation

Sebastian M. Schwarzendahl, Xu Han, Marcus Neubauer, and Jörg Wallaschek "Optimized switching algorithm for synchronized switch damping for multimodal excitation", Proc. SPIE 7643, Active and Passive Smart Structures and Integrated Systems 2010, 764303 (9 April 2010); https://doi.org/10.1117/12.847300

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