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首页> 外文会议>AIAA/CEAS aeroacoustics conference >A new MEMS microphone array for the wavenumber analysis of wall-pressure fluctuations: application to the modal investigation of a ducted low-Mach number stage
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A new MEMS microphone array for the wavenumber analysis of wall-pressure fluctuations: application to the modal investigation of a ducted low-Mach number stage

机译：一种新的用于壁压波动波数分析的MEMS麦克风阵列：在管道式低马赫数级的模态研究中的应用

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The modal analysis of modern turbofan engines encounters several limitations, amongst which lies the difficulty to position several microphones on a realistic test-rig. Another difficulty is the managment of a high number of unsteady measurement channels. Interest is growing around digital MEMS microphones, which do not require a front-end acquisition system and allow the deployment of large arrays of sensors. This study is focused on the design of a new microphone array using digital MEMS microphones. The associated signal processing in the wavenumber domain involves a spatial Fourier transform of the pressure. This representation allows a quantitative and explicit extraction of the acoustic component of wall-pressure fluctuations, and thus provides an efficient way for in-flow acoustic measurements. The array is tested and validated in acoustic and hydrodynamic academic configurations. The feasibility of a modal analysis of a low-Mach number turbofan stage is then demonstrated.
机译：现代涡扇发动机的模态分析遇到了一些限制，其中包括在实际的试验台上放置多个麦克风的困难。另一个困难是管理大量不稳定的测量通道。人们对数字MEMS麦克风的兴趣日益浓厚，因为它们不需要前端采集系统，而是可以部署大型传感器阵列。这项研究的重点是使用数字MEMS麦克风的新型麦克风阵列的设计。在波数域中的相关信号处理涉及压力的空间傅立叶变换。该表示允许定量和显式提取壁压波动的声学分量，从而为流入的声学测量提供了一种有效的方法。该阵列在声学和流体动力学的学术配置中进行了测试和验证。然后证明了对低马赫数涡扇级进行模态分析的可行性。

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