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Article

On the Directivity of Acoustic Waves Generated by the Angle Beam Wedge Actuator in Thin-Walled Structures

1
Aircraft Systems and Technologies Lab at FRC The Southern Scientific Centre of Russian Academy of Science, Rostov on Don 344006, Russia
2
Faculty of Architecture and Civil Engineering, RheinMain University of Applied Science, 65197 Wiesbaden, Germany
3
Institute of Mechanics and Applied Mathematics at the Southern Federal University, Rostov on Don 344091, Russia
*
Author to whom correspondence should be addressed.
Actuators 2019, 8(3), 64; https://doi.org/10.3390/act8030064
Received: 20 July 2019 / Revised: 25 August 2019 / Accepted: 29 August 2019 / Published: 1 September 2019
The paper aims to develop improved acoustic-based structural health monitoring (SHM) and nondestructive evaluation (NDE) techniques, which provide the waves directivity emitted by the angle beam wedge actuators in thin-walled structures made of plastic materials and polymeric composites. Our investigation includes the dispersive analysis of the waves that can be excited in the studied plastic panel. Its results allowed to find two kinds of generated acoustic waves—anti-symmetric Lamb waves (A0) and shear horizontally polarized SH waves (SS0). The bounds of the chosen frequency range for the experimental and numerical studies were accepted as a compromise between the desire to obtain a high defect resolution by generating short waves, their adjustable directivity, and maximum propagation length. The finite element model for the transducer was built by using the results of an actuator structure experimental study. The frequency response functions for the actuator current and oscillation amplitude of the footprint surface demonstrated good agreement. The found eigenfrequencies of the actuator’s structure were used for the numerical and experimental study of the Lamb and SH wave generation and propagation in a thin-walled plastic panel. Our results convincingly demonstrated the satisfactory directivity of the actuated waves at their excitation on the frequencies that corresponded to the natural modes of the actuator oscillation. The authors assume that an efficient use of the proposed technique for other analyzed quasi-isotropic materials and applied actuators can be provided by preliminary research using a similar approach and methods presented in this article. View Full-Text
Keywords: acoustic based SHM; plastics and polymeric composites; Lamb waves; horizontally polarized SH waves; angle beam wedge transducer; waves directivity acoustic based SHM; plastics and polymeric composites; Lamb waves; horizontally polarized SH waves; angle beam wedge transducer; waves directivity
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MDPI and ACS Style

Shevtsov, S.; Chebanenko, V.; Shevtsova, M.; Kirillova, E.; Rozhkov, E. On the Directivity of Acoustic Waves Generated by the Angle Beam Wedge Actuator in Thin-Walled Structures. Actuators 2019, 8, 64. https://doi.org/10.3390/act8030064

AMA Style

Shevtsov S, Chebanenko V, Shevtsova M, Kirillova E, Rozhkov E. On the Directivity of Acoustic Waves Generated by the Angle Beam Wedge Actuator in Thin-Walled Structures. Actuators. 2019; 8(3):64. https://doi.org/10.3390/act8030064

Chicago/Turabian Style

Shevtsov, Sergey, Valery Chebanenko, Maria Shevtsova, Evgenia Kirillova, and Evgeny Rozhkov. 2019. "On the Directivity of Acoustic Waves Generated by the Angle Beam Wedge Actuator in Thin-Walled Structures" Actuators 8, no. 3: 64. https://doi.org/10.3390/act8030064

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