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主要基于热声效应对石墨烯薄膜发声进行理论研究。首先建立了石墨烯薄膜耦合热振动模型,推导出了石墨烯薄膜发声器的声压表达式。在此基础上,进行了不同基底石墨烯薄膜发声器的声压测试,并将测试值与理论计算结果对比,二者随频率变化趋势基本吻合,测试值略低于理论值,验证了推导出的声压表达式的正确性。研究表明石墨烯薄膜发声器有很宽的频域响应,在低频段声压级随频率增大而增大,在高频段响应平稳,具有作为优秀的热致发声器的潜力。基底材料蓄热系数越小,石墨烯薄膜的声压值越大;声压级随薄膜热容量的增大而减小。研究结果对于石墨烯的发声机制探索及其在扬声器设计等方面的应用具有指导意义。
Based on the thermoacoustic effect, the theory of graphene film sounding is studied. First, a coupled thermal vibration model of graphene film was established, and the sound pressure expression of graphene film sounder was deduced. On this basis, the sound pressure test of different substrate graphene film sounder was carried out, and the test results were compared with the theoretical calculation results. The trend was basically consistent with the frequency change, the test value was slightly lower than the theoretical value, The correctness of the sound pressure expression. Studies have shown that graphene thin film sounders have a wide range of frequency domain responses, increasing in frequency at low frequencies with increasing frequency and stable response at high frequencies, with the potential to be excellent thermoacoustic emitters. The smaller the heat storage coefficient of the base material, the larger the sound pressure value of the graphene film. The sound pressure level decreases as the heat capacity of the film increases. The research results have instructive significance for exploring the mechanism of sound emission of graphene and its application in speaker design.