TY - CHAP
U1 - Konferenzveröffentlichung
A1 - Mayer, Andreas
A1 - Mayer, Elena
A1 - Mayer, Markus
A1 - Jäger, Philipp M.
A1 - Ruile, Werner
A1 - Bleyl, Ingo
A1 - Wagner, Karl
T1 - Full 2D-FEM calculations of third-order intermodulations in SAW devices
T2 - Ultrasonic Symposium
N2 - In a recent paper it has been shown that the effective nonlinear constant which is used in a P-Matrix approach to describe third-order intermodulation (IMD3) in surface acoustic wave (SAW) devices can be obtained from finite element (FEM) calculations of a periodic cell using nonlinear tensor data [1]. In this paper we extend this FEM calculation and show that the IMD3 of an infinite periodic array of electrodes on a piezoelectric substrate can be directly simulated in the sagittal plane. This direct approach opens the way for a FEM based simulation of nonlinearities for finite and generalized structures avoiding the simplifications of phenomenological approaches.
KW - Finite-Elemente-Methode
KW - SAW-Bauelement
KW - akustisches Bauelement
Y1 - 2016
UR - http://ieeexplore.ieee.org/document/7728469/
DO - https://dx.doi.org/10.1109/ULTSYM.2016.7728469
SP - 4
ER -
TY - JOUR
U1 - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed)
A1 - Mayer, Andreas
A1 - Pupyrev, Pavel Dmitrievich
A1 - Lomonosov, Alexey M.
T1 - Laser-generated ultrasonic pulse shapes at solid wedges
JF - Ultrasonics
N2 - Laser pulses focused near the tip of an elastic wedge generate acoustic waves guided at its apex. The shapes of the acoustic wedge wave pulses depend on the energy and the profile of the exciting laser pulse and on the anisotropy of the elastic medium the wedge is made of. Expressions for the acoustic pulse shapes have been derived in terms of the modal displacement fields of wedge waves for laser excitation in the thermo-elastic regime and for excitation via a pressure pulse exerted on the surface. The physical quantity considered is the local inclination of a surface of the wedge, which is measured optically by laser-probe-beam deflection. Experimental results on pulse shapes in the thermo-elastic regime are presented and confirmed by numerical calculations. They pertain to an isotropic sharp-angle wedge with two wedge-wave branches and to a non-reciprocity phenomenon at rectangular silicon edges.
KW - Ultraschall
KW - Lasertechnologie
Y1 - 2016
DO - https://dx.doi.org/10.1016/j.ultras.2016.04.014
VL - 70
SP - 75
EP - 83
ER -
TY - JOUR
U1 - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed)
A1 - Mayer, Andreas
A1 - Pupyrev, Pavel Dmitrievich
A1 - Lomonosov, Alexey M.
A1 - Nikodijevic, Aleksandar
T1 - On the existence of guided acoustic waves at rectangular anisotropic edges
JF - Ultrasonics
N2 - The existence of acoustic waves with displacements localized at the tip of an isotropic elastic wedge was rigorously proven by Kamotskii, Zavorokhin and Nazarov. This proof, which is based on a variational approach, is extended to rectangular anisotropic wedges. For two high-symmetry configurations of rectangular edges in elastic media with tetragonal symmetry, a criterion is derived that allows identifying the boundary between the regions of existence for wedge modes of even and odd symmetry in regions of parameter space, where even- and odd-symmetry modes do not exist simultaneously. Furthermore, rectangular edges with non-equivalent surfaces are analyzed, and it is shown that at rectangular edges of cubic elastic media with one (110) surface and one (001) surface, a tip-localized guided wave always exists, apart from special cases that are characterized.
KW - Schallwelle
KW - Anisotropie
Y1 - 2016
DO - https://dx.doi.org/10.1016/j.ultras.2016.06.016
VL - 71
SP - 278
EP - 287
ER -