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A local active noise control system based on a virtual-microphone technique for railway sleeping vehicle applications

机译:基于虚拟麦克风技术的本地主动噪声控制系统,用于铁路卧铺车辆应用

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摘要

Low-frequency broadband noise generated on a railway vehicle by the wheel-rail interaction could be a big annoyance for passengers in sleeping cars. Low-frequency acoustic radiation is extremely difficult to attenuate by using passive devices. In this article, an active noise control (ANC) technique has been proposed for this purpose. A three-dimensional cabin was built in the laboratory to carry out the experiments. The proposed scheme is based on a Filtered-X Least Mean Square (FXLMS) control algorithm, particularised for a virtual-microphone technique. Control algorithms were designed with the Matlab-Simulink tool, and the Real Time Windows Target toolbox of Matlab was used to run in real time the ANC system. Referring to the results, different simulations and experimental performances were analysed to enlarge the silence zone around the passenger's ear zone and along the bed headboard. Attenuations of up to 20 and 15 dB(A) (re:20 μPa) were achieved at the passenger's ear in simulations and in experimental results, respectively.
机译:轮轨相互作用在铁路车辆上产生的低频宽带噪声可能会对卧铺车厢中的乘客造成极大的困扰。低频声辐射很难通过使用无源设备来衰减。在本文中,为此目的提出了一种主动噪声控制(ANC)技术。在实验室中建造了一个三维客舱进行实验。所提出的方案基于专用于虚拟麦克风技术的Filtered-X最小均方(FXLMS)控制算法。使用Matlab-Simulink工具设计了控制算法,并使用Matlab的“实时Windows目标”工具箱实时运行ANC系统。参考结果,分析了不同的模拟和实验性能,以扩大乘客耳部区域和床头板周围的静音区域。在模拟和实验结果中,分别在乘客的耳朵处实现了高达20和15 dB(A)(re:20μPa)的衰减。

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