基于石墨烯薄膜的静电扬声器理论建模与仿真分析

Theoretical modeling and simulation analysis of electrostatic loudspeaker based on graphene membrane

针对基于石墨烯薄膜的新型静电扬声器设计缺乏理论指导的问题,对石墨烯静电扬声器进行了理论建模和仿真分析研究。在静电扬声器原理的基础上,采用质量-弹簧-阻尼系统建模分析了石墨烯薄膜在工作时的振动特性,研究了薄膜半径,厚度和应力对其振动特性的影响,利用COMSOL软件建立了石墨烯静电扬声器的有限元模型,对比分析了不同薄膜半径、厚度和应力对应的石墨烯静电扬声器的频率响应特性,验证了理论模型的准确性。结果表明,石墨烯薄膜半径越大,厚度越薄,应力越小,相应的石墨烯静电扬声器频率响应特性越好。

Aiming at the problem that the lack of theoretical instruction lied in the design of the new type electrostatic loudspeaker based on graphene membrane, theoretical modeling and simulation analysis are conducted on electrostatic graphene loudspeaker. Based on the working principle of an electrostatic loudspeaker, the vibration characteristic of a graphene membrane is calculated with the mass-springdamper system model. The influence of the size, thickness and stress of the membrane to the vibration characteristic is analyzed. A finite element model of the electrostatic graphene loudspeaker is built with COMSOL software. The comparison is made among loudspeakers with different size, thickness and stress in the simulation analysis, which verifies the accuracy of the theoretical model. The results show that the graphene membrane with larger radius, thinner thickness and smaller strain will contribute to better frequency response characteristic of the electrostatic graphene loudspeaker.