分别建立船舶海底门的声场模型和声-固耦合模型，对海底门的声传递损失、结构湿模态进行计算，获取海底门降噪设计需避开的共振频率。建立海底门的流体模型，采用URANS和FW-H对流场及水动力噪声进行数值计算，云图显示格栅背面出现了显著的流动分离及压力脉动，且压力峰值条带沿着格栅对角线方向分布，频谱曲线显示海底门水动力噪声以低频为主。数值计算表明，当仅将海底门钢制格栅替换成水下多孔介质材料时降噪3.4 dB。共振频率计算及水下多孔介质材料应用为海底门声学设计提供了思路。
Acoustic model and Acoustic-structural model of sea chest of ship were established separately, sound transmission loss and underwater modal were analyzed to obtain resonance frequency for noise reduction of sea chest. Fluid model of sea chest was established, and the Unsteady Reynolds-Averaged Naiver-Stokes (URANS) and FW-H method were employed 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.
2024,46(2): 128-133 收稿日期：2023-01-11
DOI：10.3404/j.issn.1672-7649.2024.02.022
分类号：U668.5
作者简介：漆琼芳(1989-),女,硕士,研究方向为船舶减振降噪
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