【摘要】 [目的]旨在研究气垫内压对气垫船水下辐射噪声的影响规律。[方法]以某气垫船为研究对象，首先，根据Newton–Raphson迭代法模拟气垫内压下围裙的成形过程；然后，基于声-固耦合有限元法建立气垫船围裙-气垫-周围水域的耦合模型，并采用模态试验对数值模型予以修正；最后，分析围裙所受压力和气垫压陷深度对气垫船水下辐射声功率的影响。[结果]研究表明：水下辐射噪声与气垫内压呈正相关，气垫内压每增加1 000 Pa，其水下辐射的总声功率级增加约0.97 dB；增大气垫船围裙刚度可有效降低气垫船低频段水下辐射声功率，增大气垫压陷深度则会增大较高频段的声功率级峰值，且使峰值位置向低频偏移。[结论]研究揭示了气垫内压对气垫船水下辐射声功率的影响规律，对气垫船水下辐射噪声的评估与数值预报具有重要指导意义。更多还原

【Abstract】 [Objective]This paper aims to reveal the influence law of cushion pressure on the underwater noise radiation of air cushion vehicles(ACVs). [Methods]An ACV is taken as a computational example.First, the forming process of the skirt under cushion pressure is simulated according to the Newton–Raphson iteration method. Second, a numerical model considering skirt-air cushion-water coupling is established via the vibro-acoustic finite element method(FEM) and calibrated based on modal tests. Third, comparisons are made of the sound power level(SWL) of the ACV’s underwater radiation noise under different pressure levels on the skirt and different cushion depression depths. [Results]Underwater radiation noise is found to be positively correlated with air cushion pressure. The overall SWL increases by nearly 0.97 dB while the air cushion pressure increases by 1 000 Pa. Increasing the stiffness of the skirt can effectively reduce the underwater radiation noise in the low frequency band, and increasing the cushion depression depth will increase the peak value of the SWL in the higher frequency band, and make the peak position shift to the low frequency direction.[Conclusion]The influence law of air cushion pressure revealed in this paper has important guiding significance for evaluating and numerically predicting the acoustic performance of ACVs.更多还原