Abstract
The energy-based analysis of the underwater acoustic emission mechanism from scuba diving equipment shows that the primary originating source of acoustic emission is turbulent air flow pressure fluctuations during the inhale phase of breathing. A scuba air tank contains a substantial amount of energy in the form of compressed air. This energy is gradually released as the air is consumed during breathing. As air expands from high pressure in the tank to lower pressure supplied to the second stage regulator, it rushes through the first stage regulator’s valve and channels creating highly turbulent air flow. The turbulent pressure fluctuations excite structural vibrations of the valve housing and connected air tank and piping in a very broad frequency range spreading above 100 kHz. In turn, vibration causes sound emission into surrounding medium (water). [Work supported by ONR].
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