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A reduced-order-model-based equivalent circuit for piezoelectric micro-electro-mechanical-system loudspeakers

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This study introduces a new modeling approach for piezoelectric micro-electro-mechanical-system (MEMS) speakers. The finite element model (FEM)-assisted equivalent circuit accurately predicts speaker performance, aiding in the design of smaller audio devices.

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Area of Science:

  • Electrical Engineering
  • Mechanical Engineering
  • Acoustics

Background:

  • Piezoelectric micro-electro-mechanical-system (MEMS) speakers are crucial for miniaturized audio devices.
  • Existing modeling methods may not fully capture the complex behavior of these speakers.

Purpose of the Study:

  • To develop a fast and accurate modeling technique for piezoelectric MEMS speakers.
  • To enable efficient design and simulation of next-generation micro-audio systems.

Main Methods:

  • A finite element model (FEM)-assisted lumped-parameters equivalent circuit was developed.
  • Electro-mechanical parameters were derived from pre-stressed FEM eigenfrequency analysis.
  • Acoustic circuit parameters were computed using analytical formulas, including air-gap modeling.

Main Results:

  • The proposed model demonstrated excellent agreement with FEM simulations and experimental data for radiated sound pressure level.
  • The method accurately accounts for complex geometries and pre-deflection effects on resonance frequency.

Conclusions:

  • The FEM-assisted equivalent circuit is a versatile and accurate tool for simulating piezoelectric MEMS speaker performance.
  • This approach facilitates the design and optimization of compact and high-performance micro-audio devices.