船舶螺旋桨空化噪声非均匀调制特性及其应用

摘要

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 workingcondi-tion. 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.%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.