摘要
由于舰船三个特定部位(尾部、中后部、中部)的辐射噪声具有明显不同的功率谱特征,利用这些特征具有实际的意义。我们采用简化的近距离舰船辐射噪声三亮点模型来逼近舰船这三个特定部位的辐射噪声中的连续谱结构,采用时间滑动的卷积算法来重构舰船某一辐射噪声源的噪声序列,重构的噪声序列同时具有要求的幅度概率分布和功率谱形状。在重构不同辐射声源时域信号的基础上,对舰船辐射噪声的通过特性以及三个辐射噪声源在不同的接收位置的影响进行了仿真。仿真结果与实测的某型舰船的通过频谱结果相比较,表明其频域特征是大体一致的。
Owing to the fact that the ship （tail, middle-back, middle） present radiated noises of the three special sections of a noticeably different features of power spectrum, it will be advantageous is significant to make use of them. In the present research, the simplified ＂three highlights＂ model for the ship-radiated noise at short distance is adopted to approach the continuous spectrum in these special sections. The convolution algorithm using a sliding time-window is used to regenerate the noise sequence of a special radiated source, the noise sequence has both specified amplitude probability distribution and desired power spectrum feature. Based on the reconstruction of the time-domain signals of the different radiated noise sources, the through signature and the addition effect of the three noise sources at differ positions has been simulated. The results of simulation of the noise process are close to the actual testing data for a certain ship,both exhibiting the similar spectrum features.
出处
《应用声学》
CSCD
北大核心
2008年第2期108-112,共5页
Journal of Applied Acoustics
关键词
噪声过程的模拟
时间滑动卷积
多源噪声模拟
通过特性
Simulation of noise process, Convolution algorithm using a sliding timewindow, Simulation of multi-source noise, Through signature
