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Coupled mechanical resonators with broken Lorentz reciprocity for sensor applications

Lijie Li Orcid Logo

Mechanical Systems and Signal Processing, Volume: 134, Start page: 106329

Swansea University Author: Lijie Li Orcid Logo

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DOI (Published version): 10.1016/j.ymssp.2019.106329

Abstract

Having simultaneously a high quality factor (i.e. a narrow resonant band) and a shorter decay time between the resonating system and the external sources (i.e. a wide resonant band) is a desirable characteristic for mechanical resonators, which however has been regarded as contradictory. This has be...

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Published in: Mechanical Systems and Signal Processing
ISSN: 08883270
Published: 2019
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa51717
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Abstract: Having simultaneously a high quality factor (i.e. a narrow resonant band) and a shorter decay time between the resonating system and the external sources (i.e. a wide resonant band) is a desirable characteristic for mechanical resonators, which however has been regarded as contradictory. This has been known as the limit of Lorentz reciprocity. We explore a configuration to achieve this desired characteristic within the mechanical regime. The configuration consists of a pair of mechanical resonators coupled together through their connecting part. One of them is encapsulated in a vacuum environment, and the other is left in the normal ambient condition. Numerical model of this configuration shows clearly the advantages such as: (a), sensitivity to the change of resonant frequency is greatly improved (the product of bandwidth and the decay time has increased at least two orders of magnitude); (b), the value of can be adjusted through the coupling stiffness.
Start Page: 106329

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