Pekeris水声波导环境中声压信号采样时段对船舶声源级评定的影响研究

Effect of sound pressure sampling duration on the assessment of ship's sound source level in the Pekeris hydro-acoustic waveguide environment

建立了一个实尺度的单层壳水下船舶结构声辐射计算模型,加载典型的船舶机械激励力。采用Pekeris水声波导环境中的船舶三维声弹性分析方法,模拟有限水深环境中航行船舶的辐射噪声测试状态,开展计算仿真。针对通过舷侧方向的观察点获取内部激励源作用下的船舶辐射噪声量值问题,探讨了观察点声压信号不同采样时段对船舶声源级评定的影响。在此基础上,给出了有助于更全面地获取船舶辐射噪声频谱特征及使得观察结果更加稳定的声压信号采样时段选取的建议。

A full-scale numerical model was established to evaluate the acoustic radiation of a single-shell underwater ship,considering typical mechanical exciting loads on the ship.The sono-elastic method in Pekeris hydro-acoustic waveguide was adopted to simulate the noise-testing state of a ship with forward speed in finite depth water.The radiated noise induced by inner excitation sources was measured at an observation point on one side of the ship.The effect of the sound pressure signal sampling duration on the assessment of the sound source level was investigated.On this basis,some suggestions on the selection of signal sampling duration were given to obtain the frequency spectral characteristics of the ship’s radiation more comprehensively and to make the observed results more stable.