Structural considerations of sound radiator driven by SMA actuator

Abstract

In this study, we aimed to develop a sound radiator driven by SMA actuators, which have fewer shape limitations. For this purpose, we developed radiators with different shapes and different ways of incorporating SMA actuators. Then, we conducted measurement tests in an acoustic measurement environment suitable for the radiators. As a result, it was confirmed that the response of a radiator as large as a headphone could be improved by increasing the number of times the SMA actuator was sewn in and by adding a taper instead of a cylindrical shape. It was also confirmed that further miniaturization will be possible.