Influences of Diaphragm Materials on the Performance of a Microspeaker
Journal
Journal of Mechanics
Journal Volume
31
Journal Issue
3
Pages
331-336
Date Issued
2015
Author(s)
Abstract
The purpose of this study was to investigate the influence of a diaphragm material on the performance of a microspeaker. The finite element method was adopted to analyze the mode shapes and the displacement of the diaphragm under a force load. The Rayleigh integral was then calculated to determine the radiated sound pressure and frequency response of a loudspeaker. The location of the voice coil was also investigated. Locating the voice coil at approximately 53% to 76% of coil-radius/diaphragm-radius ratio yielded a favorable mode shape distribution and performance for the loudspeaker. In addition, two loudspeaker designs, Models A and B, were analyzed to determine the effects of the diaphragm material. The numerical results of Models A and B, indicated that the mode shape is a crucial factor when considering the materials used in a loudspeaker diaphragm. The property of a material at the inflection point of a mode shape obviously affects the modal frequency. According to this observation, the most crucial first and second axial symmetric modes in a loudspeaker design can be adjusted and the performance can be improved. Copyright © The Society of Theoretical and Applied Mechanics, 2015.
Subjects
Diaphragm; Loudspeaker; Mode shape
Other Subjects
Diaphragms; Finite element method; Frequency response; Loudspeakers; Inflection points; Microspeakers; Modal frequency; Mode shapes; Numerical results; Radiated sound pressure; Rayleigh integrals; Symmetric mode; Electric coils
Type
journal article