船舶辐射噪声节拍音色特征研究

Research on ship-radiated noise beat tune

从人的主观感觉入手,利用心理声学方法,对船舶辐射噪声节拍音色特征进行了探讨研究。发现了节拍音色DEMON谱轴频谐波结构之间的关系,并利用仿真噪声和实际噪声进行了验证,不同类别目标之间,谐波结构存在差异,不同的谐波结构就会导致不同的节拍音色;提取了一种反映船舶噪声节拍音色的新特征——调制度特征,描述DEMON谱轴频、叶频和轴频其他谐波相对于周围干扰线谱的突出程度,并依据轴频、叶频和轴频其他谐波的调制度大小关系,作为目标分类的重要依据;最后分析了噪声频段对节拍音色的影响,噪声频段不影响节拍音色,仅因信号能量频段分布的差异导致噪声整体音色存在不同。

Starting from human subject feeling, the ship-radiated noise beat tune is researched based on psychoacoustics. The relationships between beat tune and the shaft frequency harmonic structure of DEMON are found, and verified by simulated noise and real noise. Harmonic structures between targets of different types are different, beat tunes are also different. A new feature that reflect beat tune-modulation degree-is distracted, which can describe the prominences of shaft frequency, blade frequency and other harmonics from disturbing line spectrum around. The relationship of size between shaft frequency, blade frequency and other harmonics can be an important judge in target classification. Finally the influence of noise frequency on beat tune is also analyzed. Noise frequency can＇t influence beat tune, but it＇s related to the noise whole tune.