A study on sound noise control method of sound fire extinguisher with wind

Abstract

Sound Fire Extinguisher can be an alternative to a changed fire fighting environment. However, Sound Fire Extinguisher, first released by US Defense Advanced Research Projects Agency (DARPA) and George Mason University students, can cause very large low frequency noise, which can be damaging to those who suppress conflagration. In this study, we tried to eliminate the low frequency noise of Sound Fire Extinguisher by applying directional characteristics improvement and Adaptive Noise Cancellation (ANC) technique. A proposed method for sound noise control has been verified through experiments to see how effectively it eliminates the low frequency noise of the Sound Fire Extinguisher. As a experiment result, considering the directivity characteristics of the loudspeaker, the side noise was reduced by 32 ~ 40dB by applying the the special acoustic lens and ANC method. These results show that the sound noise control effect of the special acoustic lens and ANC method applied to Sound Fire Extinguisher is very high. We hope that this study will contribute to the development of safe Sound Fire Extinguisher. © International Research Publication House.