摘要
通过大尺度模型水下试验验证基座声学设计效果对于船体声隐身研究意义重大。提出了综合运用高传递损失连接形式、阻振质量带及阻尼层的船体低噪声复合基座结构形式,并初步给出了实船应用方案。在此基础上,开展了大尺度双壳模型的水下振动、声辐射及输入功率流试验研究。测试结果表明:20～1 000Hz频带基座结构、液舱壁、内壳体振动加速度级均降低2dB以上,结构输入功率流显著降低。20～1 000Hz频带舱段5m处近场辐射声压级降低5dB以上,20～200Hz频带辐射声压周向云图表明低噪声复合基座中低频降噪效果显著。
It is of great importance to acoustic stealth study of the vessel that the effectiveness of structure-borne sound design for the base is verified through large scale underwater model test. The composite low-noise base structure is summed up by the comprehensive uses of base link structures with high transmission loss, blocking mass as well as damping layer, and the pre- liminary application version is also given. Then underwater model test for large scale double shell is carried out, including vi- bration, sound radiation and input power flow test. The test data shows that the acceleration reductions of 20~ 1 000 Hz at base, tank wall and inner shell are more than 2 dB, and the input power flow of the structure is greatly attenuated. The 20~ 1 000 Hz near field sound radiation pressure at 5 m has been reduced more than 5 dB. The circumferential distribution of 20~ 200 Hz sound pressure shows that sound pressures at low-middle frequencies are notably reduced by using composite low-noise base.
出处
《振动工程学报》
EI
CSCD
北大核心
2013年第2期277-282,共6页
Journal of Vibration Engineering
基金
中国博士后科学基金资助项目(2012M520713)
国家自然科学基金资助项目(50939002)
关键词
船舶
振动声辐射试验
低噪声复合基座
声压周向分布
中低频降噪
ship vibration and sound radiation test
composite low-noise base structure
circumferential distribution of soundpressure
noise reduction at low-middle frequencies
