开展某远洋客船光体船模水下噪声测试及带孔腔船模的水动力激励载荷测试，并进行孔腔处稳态和瞬态流场计算，孔腔处脉动压力频谱计算曲线与试验曲线吻合较好。孔腔脉动压力线谱频率测试值与经验公式频率计算值对比良好，说明该公式在一定情况下适用于船体条形格栅孔腔线谱频率的预估。采用统计能量法分析法计算光体船模中高频流激噪声，将流体激励以频率-波数功率谱的形式施加，可大大减少流场计算工作量，适合于工程快速预估。在工程一般范围内，阻尼损耗因子取值可导致噪声结果相差5.5 dB，说明阻尼损耗因子的取值会较大影响计算结果，有必要形成材料损耗因子随频率变化的数据库，为船舶噪声快速计算提供支撑。
Abstract
The underwater noise test was conducted of a bare vessel model of a certain ocean going passenger, and the hydrodynamic exciting load was tested of the vessel model with a cavity. Steady sate and transient flow was calculated in the cavity. The calculation curve of the pulsating pressure spectrum at the cavity is in good agreement with the experimental curve, and the comparison of pulsating pressure spectrum in the cavity between the frequency test value with empirical formula is in good, indicating that the formula is suitable for estimating the spectral frequency of the grid cavity under certain conditions. Statistical Energy Analysis method was employed to calculate the flow induced noise in medium-high frequency of a bare vessel model. and the application of fluid excitation of power spectrum in frequency -wave number form, could greatly reduce the workload of flow calculation and is suitable for rapid engineering estimation. Within the general scope of engineering, the value of damping loss factor could lead to a difference of 5.5 dB in noise results, indicating that the value of damping loss factor will greatly affect the calculation results. It is necessary to form a database of material loss factor with frequency to provide support for ship noise calculation.
关键词
船体模型 /
频率波数谱 /
孔腔线谱 /
流激噪声 /
统计能量分析法
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Key words
vessel model /
power spectrum in frequency and wave number /
peak frequency of cavity /
flow-induced noise /
SEA
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