摘要
有限水听器和水听器阵是一种波数滤波器，它们能够降低流噪声。本文研究粘弹性圆柱壳内圆柱面和双圆片形水听器和阵对于TBL（湍流边界层）压力起伏的响应。用波数-频率谱分析方法导出：1）单个水听器的噪声功率谱，2）两个水听器噪声的空间相关函数，3）水听器阵的噪声功率谱。通过数值积分估计了噪声降低值与水听器的形状、尺寸、阵元数、阵元间距等参数的关系。同时也计算了两个水听器噪声的宽带和窄带空间相关系数。结果表明，水听器阵可有效地降低管内噪声。
Abstract: Finite hydrophone and hydrophone array are the wave vector filter and can reduce the flownoise. This paper investigates the responses of the cylindrical area hydrophone and two-circular areahydrophone in viscoelastic cylindrical shell to the TBL (turbulent boundary layer) pressure fluctuations.Appling the method based on the wavenumber frequency analysis, we derive: 1) The power spectraldensity of noise for a single hydrophone. 2) The space correlation of noise for two hydrophones. 3) Thepower spectral density of array noise. The dependences of the noise reduction on the hydrophone shape,dimensions, numbers and separation of hydrophones of array were calculated by numerical integration.The wideband and narrowband correlations for two hydrophones were also calculated. The numericalresults show that hydrophone array can effectively reduce the interior noise.
出处
《声学学报》
EI
CSCD
北大核心
1997年第1期70-78,共9页
Acta Acustica
