Characteristics of flow-induced noise of finite hydrophone array in cavity

In this study, based on the prediction of the noise-field response of a ship sonar array, a computational model for the power-spectral-density function of a finite hydrophone array response under sonar-cavity noise field is established, targeting a sonar cavity formed by combining a rectangular cavity and an elastic plate. The calculation results indicate that when the finite hydrophone size is larger than the half-wavelength of the acoustic wave, the corresponding high-frequency-response spectrum level of the hydrophone decreases. Furthermore, as the hydrophone size and frequency increase, the hydrophone response spectrum level decreases. When the sensing area of the hydrophone array remains constant, an increase in the number of hydrophone array elements decreases the hydrophone array response spectrum level. A full-scale model test is conducted in a large cavitation channel for a rectangular hydrophone array model within a rectangular cavity. The calculated and tested noise-field response spectrum levels of the finite hydrophone array under medium to high ship speeds are found to be well-correlated.