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Analysis and Optimization of Micro Speaker-Box Using a Passive Radiator in Portable Device

机译：便携式设备中使用无源辐射器的微型扬声器箱的分析和优化

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摘要

With the rapid development of multimedia devices such as smart phones and tablet PCs, microspeakers have been recently increasingly used for audio equipment. Improving the acoustic performance of a microspeaker is always a main concern, especially in the low frequency range. To avoid sound cancelation, a microspeaker unit is usually inserted into a speaker box. A passive radiator is also used in speaker boxes to improve the sound performance in the loudspeaker system. However, passive radiators have not been applied into microspeaker system. In this study, a speaker box with a passive radiator was analyzed and optimized to achieve a higher Sound Pressure Level (SPL) in a microspeaker system. The Finite Element Method (FEM), two-degree-of-freedom (DOF) vibration theory, and a plane circular piston sound source were used to study the electromagnetic, vibration, and acoustic characteristics, respectively. Optimization was conducted by changing the mass, stiffness, and size of the passive radiator. Based on the optimized parameters, a new sample was manufactured. The experiment results show that the SPL of the optimized speaker box with a passive radiator is improved by 5 dB at 200 Hz compared with the one without a radiator. The analysis results also matched the experiment results.
机译：随着诸如智能电话和平板电脑之类的多媒体设备的迅速发展，微型扬声器最近已越来越多地用于音频设备。改善微型扬声器的声学性能始终是一个主要问题，尤其是在低频范围内。为了避免声音消除，通常将微型扬声器单元插入扬声器盒中。扬声器箱中还使用了无源辐射器，以改善扬声器系统中的声音性能。但是，无源辐射器尚未应用于微型扬声器系统。在这项研究中，对具有无源辐射器的扬声器箱进行了分析和优化，以在微型扬声器系统中实现更高的声压级（SPL）。有限元方法（FEM），二自由度（DOF）振动理论和平面圆形活塞声源分别用于研究电磁，振动和声学特性。通过改变无源辐射器的质量，刚度和尺寸进行优化。基于优化的参数，制造了一个新样品。实验结果表明，与无辐射器相比，带有无源辐射器的优化音箱的声压级在200 Hz时提高了5 dB。分析结果也与实验结果相符。

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