Vibration-Acoustic Analysis of a Cone Loudspeaker with Effects of Air Viscosity

Abstract

Recently, numerous researches on loudspeaker vibration have been conducted. However, little attention has been to the damping effect, which is of great importance concerning air viscosity in the vibration analysis of cone loudspeaker. Consequently, without consideration of the air viscosity, the accuracy in the estimation of the sound pressure frequency characteristic is deteriorated. To solve this problem, this research considers the viscosity of air in the narrow space around voice coil, and captures the air surrounding the voice coil. In this way, the high sound pressure frequency characteristics with high accuracy could be obtained. Furthermore, by considering the viscosity of the air, the vibration characteristics of the paper cone and the edge of the vibration system part can be reproduced.