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文章研究了多源随机激励下多舱段圆柱壳的辐射声功率合成规律。在水下多舱段壳体振动声辐射数值计算模型的基础上,采用统计方法处理多源随机激励的辐射声功率。讨论了源的相干性、激励位置、间距和舱壁对总辐射声功率的影响。数值计算表明:在声波波长大于壳体一半长度的低频段,无论两个源是否位于同一舱段都要考虑源的相干性影响;在环频率以上的高频段源相干性的影响可以忽略,多个源随机激励满足能量叠加原理;而在中频段可以只考虑位于同一舱段内源的相干性的影响。
In this paper, the radiation sound power of multi-shell cylindrical shell under multi-source random excitation is studied. Based on the numerical calculation model of vibrational sound radiation of multi-shell underwater casings, the radiated sound power of multi-source random excitation is dealt with by statistical method. The effects of source coherence, excitation location, spacing and bulkhead on total radiated acoustic power are discussed. The numerical results show that the influence of source coherence should be considered whether the two sources are located in the same cabin or not in the low frequency range where the acoustic wavelength is longer than half the length of the shell. The influence of source coherence at high frequency above the ring frequency can be neglected. The stochastic excitation of a source satisfies the principle of energy superposition, but only the coherence of the endogenous source located in the same section can be considered in the middle frequency range.