Abstract
Oscillations and waves in multisection periodic systems with symmetric subsystems are investigated. Many engineering systems, building structures, as well as models of acoustic metamaterials have a similar structure. The structure of the natural frequency spectrum for such a class of systems is found, taking into account the elastic properties of the constituent subsystems. It is shown that such systems have band gaps of a harmonic signal and the dispersion curve consists of n branches according to the number of degrees of freedom in the subsystem. The boundaries of the harmonic signal band gaps have been found in the analytical form. Vibration modes have been obtained in different frequency ranges. Modulated waves are shown to arise in the system due to modulation by lower frequencies that correspond to system oscillations without taking into account the elasticity of the constituent subsystems. In the analysis of symmetric structures, the theory of groups is used in combination with wave dispersion equations.
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Banakh, L.Y., Pavlov, I.S. (2023). Dynamic Properties of Periodic Structures with Symmetric Inclusions. In: Altenbach, H., Irschik, H., Porubov, A.V. (eds) Progress in Continuum Mechanics. Advanced Structured Materials, vol 196. Springer, Cham. https://doi.org/10.1007/978-3-031-43736-6_5
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DOI: https://doi.org/10.1007/978-3-031-43736-6_5
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