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首页> 外文会议>Independent Component Analyses, Wavelets, Unsupervised Smart Sensors, and Neural Networks IV >Jet Noise Analysis by Gabor Spectrogram
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Jet Noise Analysis by Gabor Spectrogram

机译：Gabor频谱图分析喷射噪声

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摘要

A research was conducted to determine the functions of a set of nozzle pairs. The aeroacoustical performance of these pairs can be used to analyze the deformation of structure and change of jet condition. The jet noise signal was measured by a microphone placed in the radiation field of jet flow. In addition to some traditional methods used for analyzing noise both in time and frequency domain, Gabor spectrogram is adopted to obtain the joint time-frequency pattern of the jet noise under different jet conditions from nozzles with different structures. The jet noise from three nozzle pairs worked under two types of working conditions is treated by Gabor spectrogram. One condition is both nozzles in the nozzle pair keep their structure at a fixed chamber pressure, while another condition is one of these two nozzles' throat size decreases during the jet procedure under a fixed chamber pressure. Gabor spectrograms with different orders for the jet noise under the second condition are obtained and compared. Then a rational order is selected in analyzing the jet noise. Results are presented in this paper. The Gabor spectrogram patterns of these two conditions are with marked difference. The noise keeps its frequency peak during the whole jet procedure in the first condition. But there is a frequency peak shift in the second condition at a certain size of throat. The distribution of frequency peak along with the decrease of throat presents two states. This would be helpful for nozzle structure recognition.
机译：进行了一项研究以确定一组喷嘴对的功能。这些对的航空声学性能可用于分析结构的变形和射流条件的变化。喷射噪声信号是通过放置在喷射流辐射场中的麦克风测量的。除了用于分析时域和频域噪声的一些传统方法外，还采用Gabor谱图从具有不同结构的喷嘴获得不同喷射条件下喷射噪声的联合时频图。 Gabor光谱图处理了在两种工作条件下工作的三个喷嘴对的喷射噪声。一种情况是喷嘴对中的两个喷嘴都在固定的腔室压力下保持其结构，而另一种情况是在固定腔室压力的喷射过程中，这两个喷嘴之一的喉咙尺寸减小。获得并比较了第二条件下喷射噪声具有不同阶数的Gabor频谱图。然后在分析射流噪声时选择一个有理数阶。结果在本文中提出。这两个条件的Gabor频谱图模式有明显的差异。在第一种情况下，噪声会在整个喷射过程中保持其频率峰值。但是，在第二种情况下，在一定喉咙大小处会有一个频率峰值漂移。频率峰值的分布随喉咙的减少呈现两种状态。这将有助于识别喷嘴结构。

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