Acoustic calculation and noise reduction with underwater porous material of sea chest
Acoustic model and Acoustic-structural model of sea chest of ship were established separately,sound trans-mission loss and underwater modal were analyzed to obtain resonance frequency for noise reduction of sea chest.Fluid mod-el of sea chest was established,and the Unsteady Reynolds-Averaged Naiver-Stokes(URANS)and FW-H method were em-ployed to investigate the flow field and hydrodynamic noise numerically.Cloud diagram indicated that flow separation and dynamic pressure was show on the back of grille,peak band of dynamic pressure was distributed along the diagonal of grille.The frequency spectrum curve show that the hydrodynamic noise of sea chest was in low frequency mainly.The overall sound pressure level decreased by 3.4 dB when only the steel grille was replaced with underwater porous medium material.Therefore,calculation of resonance frequency and application of underwater porous medium material provided ideas for acoustic design of sea chest.
sea chestacoustic-structural modelunderwater modalsound transmission lossunderwater porous medium material
万方数据
维普
