“…Let us consider wave excitation in the wedge by the rectangular piezoelectric actuator with an intermediate laminated rectangular EMM block as schematically shown by a dashed circle in Figure 1 . In the present study, we employ the boundary integral equation method [ 29 , 32 , 33 ], the semi-analytical hybrid approach [ 34 , 35 ] and the finite element method to solve the boundary-value problem described in the following subsection.…”
Section: Formulation Of the Problemmentioning
confidence: 99%
“…Wave-field in the layered waveguide with regular boundaries is obtained in the integral form using the Fourier transform of the Green’s matrix of the layered structure and a load generated by the transducer [ 34 , 35 ]. The employed numerical algorithm for the evaluation of the Green’s matrix of layered elastic structures including periodic ones can be found in [ 33 , 46 ].…”
Section: Transducer With Emm Intermediate Without Voidsmentioning
Optimization of the structure of piezoelectric transducers such as the proper design of matching layers can increase maximum wave energy transmission to the host structure and transducer sensitivity. A novel configuration of an ultrasonic transducer, where elastic metamaterial insertion is introduced to provide bulk wave mode conversion and to increase wave energy transfer into a substrate, is proposed. Configurations of layered elastic metamaterials with crack-like voids are examined theoretically since they can provide wide band gaps and strong wave localization and trapping. The analysis shows that the proposed metamaterial-based matching layers can sufficiently change wave energy transmission from a piezoelectric active element for various frequency ranges (relatively low frequencies as well as higher ones). The proposed configuration can also be useful for advanced sensing with higher sensitivity in certain frequency ranges or for demultiplexing different kinds of elastic waves.
“…Let us consider wave excitation in the wedge by the rectangular piezoelectric actuator with an intermediate laminated rectangular EMM block as schematically shown by a dashed circle in Figure 1 . In the present study, we employ the boundary integral equation method [ 29 , 32 , 33 ], the semi-analytical hybrid approach [ 34 , 35 ] and the finite element method to solve the boundary-value problem described in the following subsection.…”
Section: Formulation Of the Problemmentioning
confidence: 99%
“…Wave-field in the layered waveguide with regular boundaries is obtained in the integral form using the Fourier transform of the Green’s matrix of the layered structure and a load generated by the transducer [ 34 , 35 ]. The employed numerical algorithm for the evaluation of the Green’s matrix of layered elastic structures including periodic ones can be found in [ 33 , 46 ].…”
Section: Transducer With Emm Intermediate Without Voidsmentioning
Optimization of the structure of piezoelectric transducers such as the proper design of matching layers can increase maximum wave energy transmission to the host structure and transducer sensitivity. A novel configuration of an ultrasonic transducer, where elastic metamaterial insertion is introduced to provide bulk wave mode conversion and to increase wave energy transfer into a substrate, is proposed. Configurations of layered elastic metamaterials with crack-like voids are examined theoretically since they can provide wide band gaps and strong wave localization and trapping. The analysis shows that the proposed metamaterial-based matching layers can sufficiently change wave energy transmission from a piezoelectric active element for various frequency ranges (relatively low frequencies as well as higher ones). The proposed configuration can also be useful for advanced sensing with higher sensitivity in certain frequency ranges or for demultiplexing different kinds of elastic waves.
As artificially designed novel periodic materials and structures, phononic crystals (PCs) and acoustic/ elastic metamaterials (AMs) have many unique and extraordinary wave propagation characteristics, which provide a novel research pathway and a promising application opportunity for the efficient vibration control and precise elastic wave manipulation. However, the conventional PCs/AMs after their design and fabrication can be hardly modified with respect to their geometrical and material parameters in order to meet the actual demands, which significantly restricts their practical applications. Smart piezoelectric PCs/AMs based on the piezoelectric or electro-mechanical coupling effect can be utilized to manipulate their vibration or elastic wave propagation properties on demand by controlling the electrical field. This feature can significantly broaden the practical application ranges of the conventional PCs/AMs. This paper first classifies the smart piezoelectric PCs/AMs according to the different combination forms of the piezoelectric and elastic materials or structures roughly into three types. The first type is the unitary or monotype piezoelectric PCs/AMs, which only contain a single piezoelectric material without or with electrodes. The second type is the embedded or infill piezoelectric PCs/AMs in which the piezoelectric scatterers are embedded into an elastic matrix or vice versa. The third type is the externally bonded piezoelectric composite PCs/AMs which consist of the piezoelectric patches attached to the surfaces of an elastic base structure (rod, beam, plate, etc.). Then, based on this classification and according to the dimensional periodicity as well as the tuning method and the tuning target, the state-of-the-art research topics on the different smart piezoelectric PCs/AMs and their potential applications are briefly reviewed.
“…Advanced boundary integral equations method may also be used for the wave propagation problem solution. Using this method the problem for layered piezoelectric phononic crystals with cracks was solved in [16]. Integral equations with hypersingular kernels were applied for the solution of fracture mechanics problems in [17].…”
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