В настоящем исследовании выполняется анализ влияния различных параметров пьезопреобразователя на волновые поля, генерируемые в композитной пластине. Полуаналитический подход, основанный на применении преобразования Фурье, интегрировании по вычетам и методе стационарной фазы, используется для расчета дисперсионных кривых и волновых полей в широком диапазоне частот. Предлагается метод селективного возбуждения отдельных волн в многослойной пластине с помощью нескольких пьезоактуторов путем варьирования амплитуд подаваемых на них напряжений.

This study analyzes the effect of various parameters of the piezoelectric transducer on the wave fields generated in the composite plate. A semi-analytical approach based on the application of the Fourier transform, integration by residues and the stationary phase method is used to calculate dispersion curves and wave fields in a wide frequency range. This model allowed us to calculate the displacement fields excited in the anisotropic plate, as well as to distinguish and analyze the contribution of each wave mode to the resulting wave field. The excited fields were calculated and analyzed over a wide frequency range. Another objective of the study was to obtain the information about the shapes and positioning of multiple piezoelectric elements, which facilitate the excitation of directed waves and individual Lamb wave modes. A technique for the selection of parameters and the positioning of piezoelectric actuators required for the wave excitation was developed. It was applied and successfully tested for a combination of several ring-shaped actuators. The relations between the stress amplitudes specified on the surfaces of all actuators from the combination were determined and allowed to suppress certain waves in a multi-layered composite host-structure. It was shown that by varying the voltage applied to the piezoelectric rings, it is possible to suppress or amplify individual waves without changing their size.