动圈式扬声器数值分析方法

Research on a new numerical simulation method of moving-coil loudspeaker

为了全面和准确地预估扬声器的声学特性,提出了一种动圈式扬声器数值分析的完整方法。该方法包括磁路分析、振动分析和声场分析三个方面,基于有限元和边界元法实现对数值模型的求解。以某型号动圈式扬声器为例,详细介绍了三方面的数值分析网格模型、方法、原理、技术难点和结果,同时利用Klippel R&D测量系统和B&K Pulse系统等设备进行了精确测量,将数值分析结果与实际测量结果进行比较分析。实验结果表明,分析得到的力因子Bl值、共振频率、振幅响应以及频率响应曲线等都与实际测量结果基本吻合。

In order to accurately predict the acoustical properties of moving-coil loudspeakers, a comprehensive nu- merical simulation method is proposed. This method includes magnetic circuit analysis, vibration analysis and sound field analysis based on finite-element and boundary-element solutions. Work exposed in this paper is based on the study of a certain moving-coil loudspeaker device. Moreover, precise tests have been performed on Klippel R＆D and B＆K Pulse measurement systems. Simulation and experiment results agree very weU in parameters such as the force factor of magnetic circuit （BI）, the resonant frequency, the amplitude response of the vibration system and the frequency response in the sound field. Simulation method, theory, model accuracy and its limitations are introduced in details and illustrated with some results.