Acoustic analysis of oil-soluble medium Considering attenuation caused by presence of oil

Abstract

If oil droplets are present in an oil-soluble medium such as fluorocarbon gas, it is expected that the sound attenuation will be increased by the dissolution of the gas into the oil droplets. In this study, we model this phenomenon as a multi-degree-of-freedom system consisting of mass point, connecting spring and connecting damping. In this model, the effect of gas penetration into oil droplets is taken into consideration by the connecting spring and connecting damping. Furthermore, by conducting experiments using a shock tube in which oil droplets are sprayed to fluorocarbon gas and comparing the attenuation ratio due to acoustic free vibration with the analysis results of a concentrated mass model, the sound attenuation effects by oil droplets and the validity of the proposed model check effect by oil droplets and the validity of the proposed model Check.