An Extension of the Virtual Rotating Array Method Using Arbitrary Microphone Configurations for the Localization of Rotating Sound Sources
An Extension of the Virtual Rotating Array Method Using Arbitrary Microphone Configurations for the Localization of Rotating Sound Sources
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DOI：
10.3390/acoustics2020019
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发表时间：
2020-05
期刊：
影响因子：
--
通讯作者：
S. Jekosch;E. Sarradj
中科院分区：
文献类型：
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作者：
S. Jekosch;E. Sarradj
使用麦克风阵列方法表征旋转气动声源已被证明是一种有用的工具。识别旋转源的一种技术是虚拟旋转阵列方法。该方法在固定阵列中的麦克风之间内插压力时间数据信号以补偿旋转源的运动。该方法的一个主要缺点是需要以旋转轴为中心的环形阵列几何形状。这一贡献将虚拟旋转阵列方法扩展到任意麦克风配置。提出了两种不同的方法来插值麦克风位置之间的时间信号。第一种方法使用Delaunay三角剖分在麦克风位置之间构建网格，并使用分段线性函数在网格面上插值。第二种是基于径向基函数插值的无网格技术。该方法进行了测试，从基准测试用例的合成阵列数据，以及与螺旋阵列和五叶风扇获得的实验数据。
The characterization of rotating aeroacoustic sources using microphone array methods has been proven to be a useful tool. One technique to identify rotating sources is the virtual rotating array method. The method interpolates the pressure time data signals between the microphones in a stationary array to compensate the motion of the rotating sources. One major drawback of the method is the requirement of ring array geometries that are centred around the rotating axis. This contribution extends the virtual rotating array method to arbitrary microphone configurations. Two different ways to interpolate the time signals between the microphone locations are proposed. The first method constructs a mesh between the microphone positions using Delaunay-triangulation and interpolates over the mesh faces using piecewise linear functions. The second one is a meshless technique which is based on radial basis function interpolation. The methods are tested on synthetic array data from a benchmark test case as well as on experimental data obtained with a spiral array and a five-bladed fan.