COMSOL model for an enclosed coaxial carbon nanotube speaker

Carbon nanotube speakers are thin-film solid state speakers that operate on the principle of thermoacoustics. The speakers contain no moving parts and produce sound due to rapid oscillations in the surface temperature of the CNT film that creates pressure waves in the surrounding medium. CNT speakers are lightweight, cheap and have high operating temperature. An enclosed coaxial speaker was manufactured for automotive exhaust noise cancellation. This paper studies the COMSOL Multiphysics model for the coaxial speaker. The model is used to simulate the output sound pressure level of the speaker for different power levels. The efficiency of the speaker (both simulated and measured) is also studied using the model. The simulation results are verified by experimental testing. The model will be used to predict the behavior of the coaxial speaker for future designs and for different platforms and operating conditions.