One-way energy insulation using time-space modulated structures. (1st September 2018)

• Record Type: Journal Article
• Authors: Yi, Kaijun; Karkar, Sami; Collet, Manuel
• Is Part Of: Journal of sound and vibration. Volume 429(2018)
• Page Start: 162
• Page End: 175
• Publication Date: 2018-09-01
• Subjects: Time-space modulation -- One-way energy insulation -- Non-reciprocity -- Scattering matrix method; Sound -- Periodicals; Vibration -- Periodicals; Son -- Périodiques; Vibration -- Périodiques; Sound; Vibration; Periodicals; Electronic journals; 620.205
• DOI: 10.1016/j.jsv.2018.05.017
• Languages: English
• ISSNs: 0022-460X

Abstract

Abstract: The one-way energy insulation using time-space modulated structures is theoretically studied in this paper. Specifically, the time-space modulated structure in our studies possesses a traveling wave-like modulation. An extended scattering matrix method is developed and verified by comparing to the finite element method. The wave transmission through finite time-space modulated structures is studied using the proposed method. Results show that within the whole stop bands of the two fundamental Bloch modes of time-space modulated structures, one-way wave transmission is achievable. This non-reciprocal phenomenon can be exploited to realize one-way energy isolation in equivalent infinite or semi-infinite systems, which can be found in practice. The one-way energy isolation fails in finite systems due to a frequency conversion phenomenon resulting from the reflection.