Propagation and filtering of elastic and electromagnetic waves in piezoelectric composite structures

The dispersive characteristic of in-plane elastic waves propagating through laminated piezoelectric phononic crystal with imperfect interface is studied in this paper. First, the transfer matrix method (TMM) and the Bloch theorem are used to derive the dispersion equation. Next, the dispersion equation is solved numerically and the dispersive curves are shown in Brillouin zone. The pass band and the stop band of in-plane wave propagating normal to the laminated periodic structure with spring imperfect interface are investigated. The effects of the spring or mass parameter are discussed.

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Co-rotational shell element for numerical analysis of laminated piezoelectric composite structures

Composites Part B Engineering ◽

10.1016/j.compositesb.2017.05.061 ◽

2017 ◽

Vol 125 ◽

pp. 144-156 ◽

Cited By ~ 20

Author(s):

Dragan Marinković ◽

Gil Rama

Keyword(s):

Numerical Analysis ◽

Composite Structures ◽

Shell Element ◽

Piezoelectric Composite ◽

Rotational Shell

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The Study of a Control Signal’s Phase Shift Influence on the Efficiency of a System for Active Vibration Damping Based on MFC Piezoelectric Transducers

MATEC Web of Conferences ◽

10.1051/matecconf/202031801005 ◽

2020 ◽

Vol 318 ◽

pp. 01005

Author(s):

Marek Płaczek

Keyword(s):

Phase Shift ◽

Smart Materials ◽

Composite Structures ◽

Fiber Composite ◽

Vibration Damping ◽

Piezoelectric Transducers ◽

Piezoelectric Composite ◽

Active Vibration Damping ◽

Active Vibration ◽

The Impact

Active vibration damping of mechanical systems based on applications of smart materials has a large application potential and is getting more and more popular. In active vibration systems the fast response of actuators to the signals generated by sensors is one of the most important element that decides of the system’s efficiency because the idea is to generate force by active elements that will suppress the vibrations detected by the sensors. In this paper results of laboratory tests of a control signal’s phase shift influence on the efficiency of a system for active vibration damping based on application of Macro Fiber Composite (MFC) piezoelectric transducers are presented. MFCs are modern piezoelectric composite transducers produced as a thin, elastic films and can be easily installed on the surface of the mechanical subsystem or laminated in composite structures. The impact of the phase shifting between signals generated to power the actuator on the damping efficiency was verified and analysed. It was verified in what phase angle the damping of vibration has the best efficiency and if the shift of the signals causes the linear loss of the system efficiency. It was also verified whether it causes the same effects in both directions of shifting (advance or delay in the phase of the signal supplying the damper relative to the signal generated by the beam’s vibration).

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