低噪声复合托板水下声学试验研究  

UNDERWATER ACOUSTIC MODEL TEST OF COMPOSITE LOW-NOISE BRACE

作　　者：计方[1,2] 

机构地区：[1]中国舰船研究院,北京100192 [2]哈尔滨工程大学船舶工程学院,黑龙江哈尔滨150001

出　　处：《工程力学》2013年第12期293-297,共5页Engineering Mechanics

基　　金：国家自然科学基金项目(50939002);中国博士后科学基金项目(2012M520713)

摘　　要：提出了集成应用空心振质量块、聚氨酯吸声带板的低噪声复合托板结构方案,并初步给出了实船应用方法。在此基础上开展了大尺度双壳结构水下振动、声辐射及输入功率流的试验研究。结果表明:应用低噪声复合托板后,双壳结构外壳20Hz^3000Hz频段振动加速度级降低3.1dB,5m处近场辐射声压级降低7.2dB且沿顺时针90°~270°周向降噪效果最为显著;结构输入功率流显著降低,由多峰变为单峰且峰值频率略向低频移动。Through the combination of hollow blocking mass with polyurethane sandwich plate, the composite low-noise brace structure is designed. Its preliminary marine application is also presented. On this basis, the large scale double shells＇ underwater model test of vibration, sound radiation and input power flow is carried out. The test data show that the outer shell 20Hz-3000Hz vibration acceleration level is reduced by 3.1dB, the near field sound radiation pressure at 5m is reduced by 7.2dB. The pressure has the highest noise reduction. The input single-peaked and moves to lower frequency. 90°-270° clockwise circumferential distribution of sound power flow is also obviously attenuated, which is

关 键 词：低噪声复合托板 水下模型试验 壳体振动 声压周向分布 输入功率流 

分 类 号：U661.44[交通运输工程—船舶及航道工程]