Propagation loss analysis using ship radiated noise in shallow water

Abstract

A full scale test for ship radiated noise is conducted in East China Sea, the depth of test site is 34 m. Two hydrophones (15 m and 25 m deep) are used in the test. The CPA distances cover from 68 m to 313 m during the 8 runs. Propagation loss factors are analyzed using measurement data, which is also simulated using image source method. The simulated propagation loss factor is 12.6 from 1 kHz to 20 kHz, which is very close to test results at 1.6 kHz, mainly because there is a stationary sound source on the ship at this frequency, which is less dependent with operation stations. For other frequency bands, the sound sources are highly dependent with operation stations, the analyzed results from test data have remarkable deviation with simulation results.