编辑推荐(即内容提要):
螺旋桨发射的主要是水下辐射噪声,可能被监听到。对于军用舰艇,涉及在海洋上的安全问题。因此,有关螺旋桨噪声的技术资料处于相互保密的状态。本书对舰船螺旋桨水下辐射噪声的基本概念、噪声与水空泡化的关系、低噪声潜艇螺旋桨的研发、螺旋桨噪声的预报和评估以及低噪声螺旋桨的流体动力设计和试验等问题,作了系统的阐述。
目录:
第1章 舰船螺旋桨噪声的基本概念及定量·····························1
1.1 声是一种振动·····································1
1.2 声强························································5
1.3 水噪声声功率评估··················································8
第2章 螺旋桨模型噪声与实桨噪声换算····································13
2.1 关于声源功率························································13
2.2 空泡声相似关系——模拟系数·······································13
2.3 螺旋桨空泡噪声换算·················································19
2.4 用母型船螺旋桨估算新船螺旋桨噪声的关系式及其对降低噪声的启示························································20
第3章 螺旋桨噪声特点····················································23
3.1 螺旋桨噪声谱的变化规律·······································23
3.2 螺旋桨噪声总声级与噪声谱级的关系···································27
3.3 任意频率的桨噪声谱级及某给定频段的带宽声级························29
3.4 关于螺旋桨噪声的若干备忘·······································31
第4章 在舰船辐射噪声中的螺旋桨噪声······································35
4.1 螺旋桨噪声与空化的关系··········································35
4.2 空化发展对噪声的影响················································39
4.3 螺旋桨噪声谱图上的最高声强谱级及谱线开始下降的频率···················45
4.4 螺旋桨低噪声航速和安静航速·························47
4.5 螺旋桨唱音······················································51
4.6 螺旋桨充气降噪——气幕降噪·······················53
第5章 低噪声螺旋桨开发及舰船螺旋桨噪声预报······························54
5.1 某些潜艇用螺旋桨的分析·················································55
5.2 控制潜艇螺旋桨梢涡流动的讨论········································60
5.3 潜艇螺旋桨噪声的一般情况··········································64
5.4 关于螺旋桨毂涡流动的影响(对空泡和噪声等)···························65
5.5 舰船螺旋桨空泡噪声的估算···································70
5.6 螺旋桨噪声的“演变区”[由无空泡时的噪声谱(一10dB/oct)到空泡噪声谱(一6dB/oct)]························································78
5.7 潜艇螺旋桨啸叫声——窄带噪声峰·····································85
5.8 潜艇螺旋桨噪声谱SL计算示例·······························87
第6章 舰船螺旋桨噪声评估········································92
6.1 潜艇螺旋桨噪声的评价标准——建议·····································92
6.2 USS-212型潜艇螺旋桨和苏联33型潜艇导管螺旋桨噪声比较············94
6.3 法国Agosta-80潜艇螺旋桨和俄罗斯636型潜艇螺旋桨噪声比较············99
6.4 两型(A、B)虚拟潜艇螺旋桨的噪声比较·······················103
6.5 用七叶低噪声螺旋桨取代常规五叶螺旋桨的噪声变化······················108
6.6 螺旋桨叶梢增载与消除窄带噪声峰·····································111
6.7 各种可能航速下潜艇的螺旋桨噪声····································114
6.8 组成编队时各种舰船的螺旋桨噪声比较·································123
第7章 低噪声螺旋桨设计和螺旋桨非匀速航态的一些问题···················136
7.1 关于潜艇低噪声螺旋桨设计的讨论·······························137
7.2 关于螺旋桨模型噪声试验的问题··································140
7.3 舰船机动状态下的螺旋桨噪声备忘··························145
7.4 关于闲置螺旋桨的问题··········································146
参考文献····································149