摘要
为测量流激水下翼型结构的流噪声,提出了一种混响箱测量方法。在重力式水洞中搭建了一套实验测量系统,利用混响箱法测量了水下翼型结构模型的辐射声功率。在此基础上研究了流速及结构参数(厚度、肋、声学覆盖层)对其辐射声功率的影响。结果表明:当流速小于5 m/s时,辐射声功率随流速的6次方增长,符合偶极子的辐射规律;当流速大于5 m/s时,辐射声功率随流速的10土1次方规律增长,不再按偶极子的规律辐射;若对水下翼型结构模型加厚、加环肋及外部敷设黏弹性材料,均可在一定程度上抑制流噪声。此研究方法可对水下复杂结构的辐射声功率测量及结构优化设计提供一定的参考。
A reverberation chamber method was proposed to measure the flow-induced noise of the underwater hydrofoil structure.A measurement system was established in the gravity water tunnel,the radiated sound power of the underwater hydrofoil model was measured using this method.It is investigated also that flow speed and structure parameter （thickness,rib and acoustic covering layer） have effect on the radiated sound power.The results show that the radiated sound power will increase with U∞6.dependence（U∞is the flow speed） and show the dependence of radiated sound power on speed for dipole when U∞is less than 5 m/s;the radiated sound power will increase with U∞10±1 dependence and not indicate the dependence for dipole when U∞is more than 5 m/s;Flow-induced noise would be reduced by adding the model thickness,adding circum-ribs to it,or covering viscous-elastic material over it.The method is applicable for measuring the radiated sound power of complicated underwater structure and optimizing structural design.
出处
《声学学报》
EI
CSCD
北大核心
2012年第4期416-423,共8页
Acta Acustica
