Measurement and Characteristic Analysis of the Noise of Rectangular Truss Aquaculture Cage Platform

Abstract

The rectangular truss aquaculture cage platform is considered the main solution for modern deep-sea aquaculture equipment in the future due to its excellent wind and wave resistance, as well as its mechanization and automation capabilities. The underwater noise generated during the application of large-scale aquaculture platforms is an important basis for evaluating their impact on the underwater acoustic environment and developing intelligent aquaculture in the future. This article conducts experimental research on the rectangular truss aquaculture net cage platform “HENGYI 1” and conducts noise measurement and analysis based on the characteristics of the aquaculture platform’s operating sea area, operating process, and equipment configuration. Research has shown that the overall underwater noise of the aquaculture net cage platform is mainly distributed in the mid to low frequency range below 1000 Hz. Compared to the two sides of the platform, the underwater noise in the platform net cage is less affected by tides, and the intensity of underwater noise on the left and right sides of the net cage alternates with tides. Diesel generators are the main source of noise in truss-style aquaculture cages. When the generator is in operation, the peak power spectral density level of the noise is around 25 Hz. The results of the article can provide a reference for the study of noise in offshore aquaculture platforms.