Study of Underwater Noise Mitigation Enhancement using Balloon Arrays
Date Issued
2015
Date
2015
Author(s)
Wu, Yu-Hang
Abstract
Underwater noise mitigation effect is enhanced with balloon arrays for the stability and noise mitigation effects of bubble curtain in the ocean is limited. The noise mitigation effect is analyzed with bubble resonance theory incorporated into the film theory of the Church mathematical model[1]. Lin et al[2] reported the noise mitigation effects of one-size balloon curtain limited with frequency bandwidth, thus this study uses a balloons of two different radius, i.e. 5 cm and 7 cm, to form an array and its noise mitigation in respective frequency ranges. Result shows that using balloon array composed of balloons of two sizes, the noise mitigation effects are enhanced from 100 Hz to 1000 Hz. Design parameters of the balloon array is also considered while the noise mitigation effects of balloon array in various setup. The first parameter is the balloon size and its effect on the frequency of noise mitigation; The second parameter is the volume fraction and its impact on noise mitigation. The third parameters is the comparison of noise mitigation effect of balloon array composed of mixed sizes and of uniform size, with respect to the balloon size and volume fraction. Finally using linear regression analysis to predict the effect of volume fraction on noise mitigation in the frequency bandwidth of 160 Hz to 760 Hz. The study would provide follow-up design of the balloon array for underwater noise mitigation during pile driving, thus lower the noise impact on the marine environment.
Subjects
low-frequency piling noise
noise mitigation
balloon array
SDGs
Type
thesis
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