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Elastic Chiral Waveguides with Gyro-Hinges

Carta, G, Nieves, MJ, Jones, IS, Movchan, NV and Movchan, AB (2018) Elastic Chiral Waveguides with Gyro-Hinges. Quarterly Journal of Mechanics and Applied Mathematics, 71 (2). pp. 157-185. ISSN 0033-5614

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Abstract

This article presents a novel chiral structure, consisting of Euler–Bernoulli beams connected to gyroscopic spinners.Anew type of boundary condition is introduced, which is referred to as a gyrohinge. In this system, flexural waves are coupled with rotational motion.Time-harmonic conditions are derived by assuming small nutation angles of the spinners. It is shown that the eigenfrequencies of a finite beam with gyro-hinges at one or both ends change dramatically with the moments of inertia and the spin and precession rates of the spinners. The formulation is then extended to elastic beams with periodically-spaced gyro-hinges, whose dispersion properties are investigated in detail. In particular, it is shown how stop-bands and standing modes are affected by the introduction of gyroscopic spinners at the junctions. It is also demonstrated that a periodic system composed of beams connected by gyro-hinges represents a good approximation of a gyrobeam, a theoretical structural element consisting of an elastic beam possessing a continuous distribution of stored angular momentum. The gyricity coefficient of a gyrobeam is then interpreted in terms of the physical parameters of the system of beams with gyroscopic spinners. This article opens a new perspective on the design and practical implementation of chiral mechanical systems.

Item Type: Article
Uncontrolled Keywords: 0102 Applied Mathematics, 0913 Mechanical Engineering, 0905 Civil Engineering
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Maritime and Mechanical Engineering
Publisher: Oxford University Press
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Date Deposited: 06 Jun 2018 11:14
Last Modified: 20 Sep 2018 16:33
DOI or Identification number: 10.1093/qjmam/hby001
URI: http://researchonline.ljmu.ac.uk/id/eprint/8787

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