计及空腔能量耗散的尖劈结构声学特性研究

以喇叭型空腔为例分析了声波在尖劈空腔中的传播规律,给出了计及空腔能量耗散作用的尖劈结构吸声系数计算方法,通过声管测试验证了本文算法的有效性。在此基础上,通过数值试验预报了声呐平台区振动及自噪声分布,对比分析了空腔尖劈敷设方案对其声学特性的影响。结果表明:空腔对较低频段声波能量吸收有很大作用,在3 kHz以下频段计算空腔尖劈吸声性能时必须予以考虑;敷设空腔尖劈的声呐平台区的振动及自噪声总声压级显著降低,尖劈部分优化敷设既要兼顾声呐基阵位置处的声压分布。

Acoustic Characteristics of Wedge Structure Taking Account of Cavity Energy Dissipation

Taking horn cavity as an example,the rule of sound propagation in cavity was researched,and the amended calculation method taking account of energy dissipation in the cavity was summed up.The validity of calculation method was also verified through sound pulse pipe test.Furthermore,the vibration and self-noise distribution of sonar platform was predicted through numerical experiment.The influence of cavity wedge laying conditions to sonar platform acoustic characteristics was analyzed.The results show that the cavity acoustic energy absorption is very effective in low frequency,and the calculation of cavity wedge acoustic performance must be taken into account below 3kHz.The laying of cavity wedge obviously reduces the vibration level and total self-noise level of sonar platform,part laying method of wedge must consider the pressure distribution of sonar array.