扬声器
有限元法
等效电路
微电子机械系统
声学
微尺度化学
压电
电子工程
计算机科学
工程类
电气工程
电压
物理
结构工程
数学
数学教育
量子力学
作者
Chiara Gazzola,Valentina Zega,Alberto Corigliano,P. Lotton,Manuel Melon
出处
期刊:Journal of the Acoustical Society of America
[Acoustical Society of America]
日期:2024-02-01
卷期号:155 (2): 1503-1514
被引量:3
摘要
Piezoelectric micro-electro-mechanical-system (MEMS) speakers are emerging as promising implementations of loudspeakers at the microscale, as they are able to meet the ever-increasing requirements for modern audio devices to become smaller, lighter, and integrable into digital systems. In this work, we propose a finite element model (FEM)–assisted lumped-parameters equivalent circuit for a fast and accurate modeling of these types of devices. The electro-mechanical parameters are derived from a pre-stressed FEM eigenfrequency analysis, to account for arbitrarily complex geometries and for the shift of the speaker resonance frequency due to an initial non-null pre-deflected configuration. The parameters of the acoustical circuit are instead computed through analytical formulas. The acoustic short-circuit between the speaker front and rear sides is taken into account through a proper air-gaps modeling. The very good matching in terms of radiated sound pressure level among the equivalent circuit predictions, FEM simulations, and experimental data proves the ability of the proposed method to accurately simulate the speaker performance. Moreover, due to its generality, it represents a versatile tool for designing piezoelectric MEMS speakers.
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