Exploitation of modal superposition toward forced vibration localization in a coupled symmetric oscillator array

In transducer arrays, symmetric grouping of identical elements is often employed to achieve uniform array performance. Such arrays can possess high coupling, preventing localized operation of individual transducers. This paper provides insight into how forced vibration localizes in a symmetric system of coupled oscillators. We use a simple lumped-parameter model of highly coupled oscillators derived from ultrasound transducer arrays. Forced vibration localization can be shown to be inversely related to the coupling strength between the oscillators. The results demonstrate how forced vibration in a coupled symmetric system may localize through modal superposition and how it may be tuned via the spacing of natural frequencies. Breaking the system’s symmetry leads to normal mode localization, which can be shown to affect the forced vibration response. The results reveal a variation in the system’s resonance frequency, attributed to curve veering effects.

Content

Subjects

transducer arrays

coupled oscillators

forced vibration

localization

curve veering

modal superposition

DDC Class

530: Physics

621.3: Electrical Engineering, Electronic Engineering

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https://creativecommons.org/licenses/by/4.0/

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publishedVersion

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sensors-25-03106-v2.pdf

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