Rotating acoustic source localization: A power propagation forward model and its high-resolution inverse methods
Rotating acoustic source localization: A power propagation forward model and its high-resolution inverse methods
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DOI：
10.1016/j.measurement.2021.109006
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发表时间：
2021-01-23
期刊：
影响因子：
5.6
通讯作者：
Wu, Dazhuan
中科院分区：
文献类型：
--
作者：
Chu, Ning;Huang, Qian;Wu, Dazhuan
旋转声源定位在旋转机械故障诊断、发动机降噪、螺旋桨识别等领域发挥着重要作用。为了实现快速旋转声源的高分辨率定位，基于等效声源假设，提出了一种改进的旋转声源功率传播正演模型。然后提出了两种基于稀疏性的方法：旋转声源的最小绝对收缩选择算子（LASSO-RS）和旋转声源的最小角度回归（LAR-RS），鲁棒地解决了由前向功率模型导出的病态逆问题。本文的贡献是，一方面，改进的正演模型确实是时不变的快速旋转的源由于时域去多普勒技术;另一方面，高分辨率的声学地图，可以得到建议LASSO-RS和LAR-RS由于稀疏为基础的正则化，即使在很低的信噪比（SNR）。此外，建议的LAR-RS是数据驱动的方法，而不是参数依赖的方法，如LASSO-RS与正则化参数的仔细选择。仿真和实验结果表明，在3000 RPM转速（50 Hz）、-5 dB信噪比和2500 Hz工作频率下，所提出的方法能够鲁棒地定位旋转单极子。
The rotating-acoustic source localization has played an important role in rotary machine fault diagnosis, engine noise reduction and propeller recognition etc. To achieve high-resolution localization of fast rotating sources, this paper proposes an improved power propagation forward model of rotating acoustic source based on the equivalent source hypothesis. Then the ill-posed inverse problem derived from the forward power model is solved robustly by proposed two sparsity-based methods: the Least Absolute Shrinkage and Select Operator for Rotating-acoustic Sources (LASSO-RS) and Least Angle Regression for Rotating-acoustic Sources (LAR-RS). The contributions of this paper are that, at one hand, the improved forward model is indeed time-invariant for the fast-rotating source owing to the time-domain de-Doppler technique; at the other hand, high-resolution acoustic maps can be obtained by proposed LASSO-RS and LAR-RS thanks to the sparsity-based regularization, even under very low signal-to-noise ratio (SNR). Moreover, the proposed LAR-RS is the data-driven method, rather than the parameter-dependent method such as the LASSO-RS with careful selection of regularization parameter. In simulations and experiments, the proposed methods can robustly localize rotating monopoles in the condition of 3000 RPM rotation speed (50 Hz), -5 dB SNR, and 2500 Hz working frequency.