从螺旋桨空化噪声谱统计模型出发，分析研究螺旋桨空化噪声非均匀调制特性的机理和规律，并利用大量海上实录船舶噪声进行验证。从形成机理看，认为非均匀调制特性主要由船尾形状、螺旋桨结构以及船舶航行工况共同决定的尾流分布所导致，不同型号船舶的非均匀调制特性具有个体性；从舰船噪声信号能量谱看，调制的非均匀特性，主要受能量谱峰值频率的影响。最后基于船舶噪声的非均匀调制特性，提出一种基于多子带自适应加权的DEMON增强算法，并利用实际数据进行验证。
Based on the statistical model of ship propeller cavitation noise spectrum, the mechanism and laws of non-uniform modulation feature of propeller cavitation noise are analyzed and studied, and also be verified by a large number of ship radiated noise. From thepoint of formed mechanism, it shows that non-uniform modulation feature is mainly formed by the distribution of wake flow, which is formed by the combined action of stern shape, propeller structure and working condition. Non-uniform modulation feature vary in different class ship. Then from the point of ship radiated noise spectrum, non-uniform modulation feature is mainly decided by the energy spectrum peak frequency. Finally, an application method of non-uniformity envelope is proposed, that is the technology of DEMON line spectrum strength based on multi sub-band adaptive weighted, and it is also verified by real date.
2017,39(6): 18-22 收稿日期：2017-03-14
DOI：10.3404/j.issn.1672-7619.2017.06.004
分类号：TB533
作者简介：刘启军(1975-),男,硕士,讲师,研究方向为水声目标识别。
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