Abstract
Measurements and predictions from numerical models for the response of and radiation from a micro-loudspeaker are compared. The numerical models are then used to examine various means for improving the performance of the loudspeaker radiation by varying the material properties of the loudspeaker. A commercial finite element code uses measured material properties to predict the diaphragm velocity distribution of lower order modes. Noncontact laser vibrometer measurements on the excited speaker are compared with the FEM predictions. The radiation from the loudspeaker, at frequencies of resonance, is predicted by a boundary element model. Diaphragm material properties (density, thickness, and elastic modulus) were varied and the sensitivity of the radiation to the material properties of the diaphragm determined.
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