船舶舱室空气噪声激励引起水下辐射噪声传递特性试验研究

Tests for underwater radiated noise transmission characteristics caused by ship cabin air noise excitation

实船试验研究了舱室空气噪声激励引起水下辐射噪声传递特性。采用模拟声源激励方式,建立舱室空气噪声激励引起水下辐射噪声实船试验方法。利用单输入/输出模型与传递函数,建立空气噪声至水下辐射噪声传递特性分析方法。通过实船声源激励试验,获取了空气噪声、水下辐射噪声及空气噪声至水下辐射噪声传递函数,分析给出空气噪声激励引起水下辐射噪声特征规律与传递特性,验证了实船传递特性试验与分析方法的可行性及有效性。研究结果表明,舱室空气噪声与水下辐射噪声呈线性关系,其传递关系表现为与频率相关的线性系统特征,50 Hz^5 kHz频段空气噪声至水下辐射噪声传递函数总体变化趋势呈现先增大后减小的特征规律。

Real ship tests were conducted to study transmission characteristics of underwater radiated noise caused by cabin air noise excitation. A real ship test method for underwater radiated noise caused by cabin air noise excitation was established with the simulated sound source excitation method. Based on a single input/output model and transfer function, the analysis method for transfer characteristics from air noise to underwater radiated noise was established. Real ship sound source excitation tests were conducted to acquire time histories of air noise and underwater radiated noise as well as the transfer function from air noise to underwater radiated noise, analyze feature laws and transmission characteristics of underwater radiated noise caused by air noise excitation, and verify the feasibility and validity of the real ship transfer characteristics test and analysis method. Results showed that there is a linear relationship between cabin air noise and underwater radiated noise;their transfer relationship presents characteristics of a linear system related to frequency;the overall change trend of the transfer function from air noise to underwater radiated noise within the frequency range of 50 Hz-5 kHz has a feature law of first increase and then decrease.