Affiliations: Université de Lyon, CNRS INSA-Lyon, LaMCoS UMR5259, F-69621 Villeurbanne, France
Correspondence:
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Corresponding author: S. Chesné, Université de Lyon, CNRS INSA-Lyon, LaMCoS UMR5259, F-69621 Villeurbanne, France. E-mail:simon.chesne@insa-lyon.fr
Abstract: The next challenge in the field of embedded structures is the development of
an efficient, energetically autonomous vibration control technique. The
proposed new approach consists in transferring energy between modes of the
same structure: energy is harvested in a uncontrolled mode to increase
attenuation in a targeted mode. This approach may even permit a
`stand-alone' design by generating constant voltages by using the structural
motion with an energy harvesting technique. The proposed electrical
architecture - called synchronized switch damping and harvesting (SSDH) - is
composed of a harvesting circuit (synchronized switch harvesting on inductor
[SSHI]), a DC-DC converter (buck-boost topology), and a modal circuit to
control vibration (similar to combining the synchronized switch damping on
voltage [SSDV] and modal synchronized switch damping on inductor [SSDI]
methods). The theoretical analysis and numerical simulation of this
architecture addressed the transfer of modal energy through a smart
structure based on an academic case: a cantilever beam. The study aimed to
increase damping in a selected mode by using the energy of other modes in
configurations with realistic energy distributions. The circuit and energy
transfer were analyzed to determine the minimum modal contributions
necessary to achieve this aim and to ensure long-term stability (steady
state). Compared with traditional SSDI, the bi-harmonic excitation used with
this new technique increased attenuation damping by 13 dB. The proposed
general approach can be extended to the majority of complex or composite
industrial structures subjected to vibration.
Keywords: Semi-active control, energy harvesting, smart structures, modal energy transfer
