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The Sound Fire Extinguisher is a device that suppresses flame using sound energy. Therefore, it is important to transmit loud sounds to the flame even under the same conditions. At the Sori Sound Engineering Research Institute (SSERI), sound was focused and resonance and amplification through the special acoustic lens using Horn Effect. Through this, the Sound Fire Extinguisher's high power, small size, and light weight were realized. In this study, we tried to improve output efficiency by efficiently focusing various sound components present in the special acoustic lens through trimming of fundamental frequency. The fundamental wave and higher harmonics in the special acoustic lens cause phase difference due to the length difference of various transmission paths, and interfere with each other to act as reinforcement or extinction. At this time, the phases of composite sounds can be matched through trimming of fundamental frequency. However, it is somewhat unrealistic to match the phases of all sounds on various transmission paths, so we tried to improve the output by finding the optimal frequency where various sounds are efficiently concentrated. In a frequency trimming experiment of 60 ± 10 Hz, it was confirmed that the output differed by up to 2.5 times according to the change in frequency. Through these experiments, it was confirmed that the output of the Sound Fire Extinguisher can be improved through frequency trimming using the structural characteristics of the special acoustic lens. Keyword: Sound Fire Extinguisher, special acoustic lens, frequency trimming, phase, output improvement

A Study on Improvement of Special Acoustic Lens Output through Frequency Trimming