Abstract
This paper describes the vibroacoustic coupling between the structural vibrations and internal sound fields of thin structures. In this study, a cylindrical structure with thin end plates is subjected to the harmonic point force at one end plate or both end plates, and a natural frequency of the end plates is selected as the forcing frequency. The resulting vibroacoustic coupling is then analyzed theoretically and experimentally by considering the dynamic behavior of the plates and the acoustic characteristics of the internal sound field as a function of the cylinder length. The length and phase difference between the plate vibrations, which maximize the sound pressure level inside the cavity, are clarified theoretically. The theoretical results are validated experimentally through an excitation experiment using an experimental apparatus that emulates the analytical model. Moreover, the electricity generation experiment verifies that sufficient vibroacoustic coupling can be created for the adopted electricity generating system to be effective as an electric energy-harvesting device.
Highlights
Scavenging ambient vibration energy and converting it into usable electric energy via piezoelectric materials have attracted considerable attention [1]
The end plate was subjected to a harmonic point force
The present study focused on promoting the vibroacoustic coupling to increase the flexural displacements of the plates and the sound pressure level inside the cavity
Summary
Scavenging ambient vibration energy and converting it into usable electric energy via piezoelectric materials have attracted considerable attention [1]. Typical energy harvesters adopt a simple cantilever configuration to generate electric energy via piezoelectric materials, which are attached to or embedded in vibrational elements. The acoustic energy spent on electricity generation was harvested from a resonance tube branching out of the engine, and the appropriate position of the resonance tube for effectively generating electricity was described [4]. An electricity generating device using the sound of voice via piezoelectric elements was developed as a supplementary electric source for a mobile phone [5]. This system is being investigated for other applications [6]. Vibroacoustic coupling is one way to increase acoustic energy, it has not yet been investigated extensively in this context
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