摘要
在水下航行器的辐射噪声中 ，螺旋桨节拍对航行器的宽带辐射噪声存在着明显的振幅调制，调制频率与航行器螺旋桨的转速有关．该特征可用于估计航行器的速度及目标分类与识别．本文利用于波变换原理，从实测的航行器辐射噪声中提取了它的调制谱，井据此对螺旋桨转速进行了估计，计算机仿真结果与实测的螺旋桨的转速具有良好的一致性。
In the radiated noise of the underwater vessels, there are obvious amplitude- modulation for broadband noise resulted by the propeller's tap. The modulation frequen- cies are related to the rolling speed of propellers of the vessel. This characteristic can be used to estimate the velocity of the vessel, and to classify and identify it. In this paper, wavelet transform is used to extract the modulation spectrum from the real radiated noise of the vessels. Based on the results, the rolling speed of the propeller is estimated, and the simulation results on computer are well consistent with the real rolling speed of the propeller.
出处
《应用声学》
CSCD
北大核心
2000年第1期27-31,共5页
Journal of Applied Acoustics
关键词
辐射噪声
子波变换
调制谱
水下航行器
Radiated noise, Wavelet transform, Modulation spectrum, Computer sim- ulation
