29 July 2004 Evaluation of an enhanced semi-passive technique for the reduction of structural noise and vibrations
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Proceedings Volume 5386, Smart Structures and Materials 2004: Damping and Isolation; (2004); doi: 10.1117/12.541110
Event: Smart Structures and Materials, 2004, San Diego, CA, United States
Abstract
For the reduction of structural noise and vibrations, passive techniques are widely used, and active control has now been widely studied. At the meeting of both approaches, semi-passive techniques have seemed to be too limited, until recently and a new technique: Synchronized Switch Damping on Inductance (SSDI). For the modelization of this method in a piezo-structural context, we wrote a new formulation based on the electrical displacement. Its use in a finite-element code allowed us to simulate simple cases on beams in low frequency. This was validated with experiments. For structural acoustics cases, we designed a specific test setup in order to study the interaction of structural vibrations with the sound in enclosures: a box composed of five rigid walls, the sixth wall being flexible and excited by a shaker. The experiments showed that substantial reduction of vibrations can be achieved in low frequency at various peaks when using various piezoelectric patches on the plate, connected to the SSDI devices. In some cases, good reduction can also be obtained on the noise level. Comparison with active control was less favourable, but interesting possibilities could emerge by mixing the two techniques at the same time.
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Martin Calmon, Daniel Guyomar, Roger Ohayon, "Evaluation of an enhanced semi-passive technique for the reduction of structural noise and vibrations", Proc. SPIE 5386, Smart Structures and Materials 2004: Damping and Isolation, (29 July 2004); doi: 10.1117/12.541110; https://doi.org/10.1117/12.541110
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KEYWORDS
Acoustics

Switches

Inductance

Capacitance

Optical simulations

Zoom lenses

Computer aided design

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