Attenuation andlocalization  of wave propagation in rods with  periodic shuntedpiezoelectric patches

O Thorp; M Ruzzene; A Baz

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Attenuation andlocalization of wave propagation in rods with periodic shuntedpiezoelectric patches

机译：Attenuation andlocalization of wave propagation in rods with periodic shuntedpiezoelectric patches

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Shunted piezoelectric patches are periodically placed along rodsto control the longitudinal wave propagation in these rods. Theresulting periodic structure is capable of filtering thepropagation of waves over specified frequency bands called stopbands. The location and width of the stop bands can be tuned,using the shunting capabilities of the piezoelectric materials,in response to external excitations and to compensate for any structural uncertainty.A mathematical model is developed to predict the response of arod with periodic shunted piezoelectric patches and to identifyits stop band characteristics. The model accounts for theaperiodicity, introduced by proper tuning of the shuntedelectrical impedance distribution along the rod. Disorder inthe periodicity typically extends the stop bands into adjacentpropagation zones and, more importantly, produces thelocalization of the vibration energy near the excitationsource. The conditions for achieving localized vibration areestablished and the localization factors are evaluated fordifferent levels of disorder on the shunting parameters.The numerical predictions demonstrate the effectiveness andpotentials of the proposed treatment that requires no controlenergy and combines the damping characteristics of shuntedpiezoelectric films, the attenuation potentials of periodicstructures, and the localization capabilities of aperiodicstructures. The theoretical investigations presented in thispaper provide the guidelines for designing tunable periodicstructures with high control flexibility where propagatingwaves can be attenuated and localized.

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《smart materials and structures》 |2001年第5期|979-989|共页
作者
O Thorp; M Ruzzene; A Baz;
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作者单位

Engineering and Weapons Division, US NavalAcademy, Annapolis, MD 21402, USA;

Mechanical EngineeringDepartment, Catholic University of America, Washington, DC 20064, USA;

Mechanical Engineering Department, University ofMaryland, College Park, MD 20742, USA;

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Attenuation andlocalization of wave propagation in rods with periodic shuntedpiezoelectric patches

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