Location of rotating sources by phased array measurements
Location of rotating sources by phased array measurements
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DOI：
10.2514/6.2001-2167
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发表时间：
2001-03
期刊：
影响因子：
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通讯作者：
P. Sijtsma;S. Oerlemans;H. Holthusen
中科院分区：
文献类型：
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作者：
P. Sijtsma;S. Oerlemans;H. Holthusen
描述了一种通过麦克风阵列定位移动源的方法。该方法可应用于敞口喷流风洞的出流测量。为此，推导了均匀流中运动单极压力场的表达式。认为开放射流剪切层并不构成严重的障碍。介绍了一种高信噪比功率谱重建技术。该方法适用于旋转源，产生了计算机程序ROSI(旋转源识别符)。给出了ROSI在旋转哨声、直升机悬停叶片和风力机叶片等方面的应用。旋转哨子的测试令人信服地展示了重建发出的声音的能力。在直升机叶片上，旋转的宽带噪声源清晰可见。在风力机叶片上，可以很好地区分从前缘和后缘发出的噪声。2001年5月28日至30日在荷兰马斯特里赫特举行的第七届AIAA/CEAS气动声学会议上提交的文件。
A method is described for the location of moving sources by a microphone array. This method can be applied to out-of-flow measurements in an open jet wind tunnel. For that purpose, an expression is derived for the pressure field of a moving monopole in a uniform flow. It is argued that the open jet shear layer does not form a serious obstacle. A technique is described for reconstruction of power spectra with high signal/noise ratio. The method was implemented for rotating sources, resulting in the computer program ROSI ("Rotating Source Identifier"). Applications of ROSI are given for rotating whistles, blades of a helicopter in hover and wind turbine blades. The test with the rotating whistles demonstrated convincingly the capability to reconstruct the emitted sound. On the helicopter blades, rotating broadband noise sources were made clearly visible. On the wind turbine blades, noise emitted from the leading and trailing edge could be distinguished well. Paper presented at the 7th AIAA/CEAS Aeroacoustics Conference, Maastricht, The Netherlands, 28-30 May 2001.