더스트캡의 주기적 진동을 고려한 스피커내부의 2차원 비정성상태 열유체 모델링

Abstract

The temperature controls at voice coils, for example, are critical in terms of durability of the loudspeakers. The maximum temperature of loudspeakers appears at voice coils and therefore, it is of great importance to maintain the maximum temperature in a stable operation range to increase durability and life time of loudspeakers. In this work, a two-dimensional transient computational simulation for loudspeakers was performed to figure out dynamic fluid motions and heat transfer phenomena by using a commercial CFD package, FLUENT®. In addition, a thermal circuit analysis (TCA) model was developed to facilitate numerical prediction of temperature distributions inside loudspeakers by using lumped heat transfer modeling and effective thermal conductivities for induced convection effects in dynamic fluidic zones. Then, the theoretical predictions of the TCA modeling were validated against experimental data with good accuracy. Different materials for voice coil and bobbin, radius of voice coil, width of bobbin and inclined angle of corn-shaped yoke were selected as input parameters for the TCA model. We found that the inclined angle of corn-shaped has strong effect on the maximum temperature of voice coils. The mass flow rate can be increased by approximately 4% and the maximum temperature of voice coil reduced by relatively 21 °C at an inclined angle of 40 degrees. These combined computational and thermal circuit analysis efforts can be greatly utilized to develop optimal designs of commercial loudspeakers.