Vibration control efficiency of piezoelectric shunt damping system |
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Authors: | Dan Wu Zhichun Yang and Hao Sun |
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Affiliation: | (1) Department of Aerospace Engineering, Middle East Technical University, Ankara, Turkey;(2) STM Savunma Teknolojileri Muhendislik ve Ticaret A.S., Ankara, Turkey;(3) Mechanical and Aerospace Engineering Department, Carleton University, Ottawa, Canada |
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Abstract: | The piezoelectric shunt damping technique based on the direct piezoelectric effect has been known as a simple, low-lost, lightweight,
and easy to implement method for passive damping control of structural vibration. In this technique, a piezoelectric material
is used to transform mechanical energy to electrical energy. When applying the piezoelectric shunt damping technique to passively
control structural vibration, the piezoelectric materials must be bonded on or embedded in host structure where large strain
is induced during vibration, thus to ensure vibrational mechanical energy to be transformed into electrical energy as much
as possible.
In this paper, the concept of vibration control efficiency of a piezoelectric shunt damping system is proposed and studied
theoretically and experimentally. In the study, PZT patches are used as energy converter, and the vibration control efficiency
is expressed by the vibration reduction rate per area of the PZT patches. Emphasis is laid on the effect of the generalized
electromechanical coupling coefficient K
31 on the vibration control efficiency. Four PZT patches with different sizes are bonded on the geometrical central area of
four similar clamped aluminum plates, respectively, and vibration control experiments are conducted for these plates using
the R-L shunt circuit. The results indicate that the bigger the coupling coefficient K
31, the larger the rate of vibration reduction, and hence, the higher the vibration control efficiency. It also shows that the
vibration responses of the first mode of the plates bonded with different PZT patches can be reduced by about 30.5%, 48.58%,
85.47%, and 89.91%, respectively. It comes to a conclusion that the vibration control efficiency of the piezoelectric shunt
damping system decreases with the increase of the area of the PZT patch, whereas the vibration reduction of the plate increases
with the area of the PZT patch. Therefore, it is necessary to make topology optimization for the PZT patch in the vibration
control utilizing the piezoelectric shunt damping technique. |
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