Multiple topological interface modes in electromechanically resonant piezoelectric beams. (15th April 2023)

• Record Type: Journal Article
• Authors: Wu, Zheng; Xia, Rongyu; Yi, Jianlin; Li, Zheng
• Is Part Of: Engineering structures. Volume 281(2023)
• Publication Date: 2023-04-15
• Subjects: Piezoelectricity -- Flexural waves -- Electromechanical resonances -- Topological interface modes; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2023.115716
• Languages: English
• ISSNs: 0141-0296

Abstract

Abstract: Topological insulators (TIs) have been rapidly developed for their defect-immune capability of wave transport, and promoted the innovation in designing smart devices with robust wave manipulation functions. In this paper, a tunable topological piezoelectric beam is designed by an elastic beam attached piezoelectric patches with shunting inductance circuits. Controllable topological phase transition is realized by adjusting the shunting inductances to alter the electromechanical resonances. Multiple topologically protected interface modes (TPIMs) are obtained by connecting two kinds of piezoelectric beams with different topological properties together. Furthermore, the effects of inductance deviations and structural defects on the topological beam are investigated to verify the robustness of the TPIMs. Finally, a novel topologically protected demultiplexer is designed to achieve the smart spatial separation of flexural waves based on the TPIMs. This demultiplexer broadens the applications of TIs and provides a new avenue for the separation and purification of elastic waves. Highlights: Topological piezoelectric beams with multiple interface modes are proposed. Effects of electromechanical resonances to topological bandgaps are clarified. The frequency range of topological bandgaps is easily tuned by the shunting circuit. A two-channel demultiplexer is designed to spatially separate flexural waves.