Detect Nozzle Deformation by JTFA Pattern of Jet Noise: Assessment of the Procedure

机译：通过喷射噪声的JTFA模式检测喷嘴变形：程序评估

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As the deformation in nozzle will cause thrust miss aligned and other problems which would degrade the performance of rocket severely, deformation detection will help to correct the ballistic parameters for control and guide of the rocket. Prior or real time detection is important for calculate the ballistic parameters. Rocket noise in active period during rocket launch has close relationship with core length in the exhausted jet flow. The core length depends on the nozzle structure and the combustion situation inside chamber. If the parameters inside chamber are fixed, the core length could be determined by nozzle structure. Thus the jet noise would reflect the change in nozzle structure. Experiments with cold jet flow were conducted to explore the relationship between nozzle deformation and the spectrum pattern of jet noise. Three groups of nozzles with different expansion ratio, length of expand segment, and throat structure were used in the experiment. The spectrums of jet noise for each nozzle under different chamber pressure were obtained as a reference to detect the deformation in nozzles. Then the nozzle was deformed artificially and the jet noise was analyzed by joint time-frequency analysis (JTFA) method. Several JTFA algorithms are used to process the noise data. The joint time-frequency distribution pattern reflects the change in nozzle structure.

机译：由于喷嘴中的变形将导致推力未对准和其他问题，从而严重降低火箭的性能，因此变形检测将有助于校正用于控制和引导火箭的弹道参数。事前或实时检测对于计算弹道参数很重要。火箭发射过程中活跃期的火箭噪声与排出的射流中的核心长度密切相关。芯长取决于喷嘴结构和燃烧室内部的燃烧情况。如果腔室内的参数是固定的，则芯长可以通过喷嘴结构确定。因此，喷射噪声将反映喷嘴结构的变化。进行了冷射流实验，以探讨喷嘴变形与射流噪声谱图之间的关系。实验中使用了三组具有不同膨胀比，膨胀段长度和喉部结构的喷嘴。获得了每个喷嘴在不同腔室压力下的射流噪声频谱，作为检测喷嘴变形的参考。然后对喷嘴进行人工变形，并通过联合时频分析（JTFA）方法分析喷射噪声。几种JTFA算法用于处理噪声数据。联合时频分布图反映了喷嘴结构的变化。

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来源
《Sensors for Propulsion Measurement Applications》|2006年|P.62220P.1-62220P.9|共9页
会议地点 KissimmeeFL(US)
作者
Xu Qiang;
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作者单位

School of Mechanical Engineering Nanjing University of Science Technology, Nanjing 210094, P. R. China;

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会议组织
原文格式 PDF
正文语种 eng
中图分类 V441.7;
关键词
rocket noise; acoustics characteristics; nozzle deformation; joint time-frequency analysis;

机译：火箭噪声；声学特性；喷嘴变形；联合时频分析;

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专利

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机译：分析喷嘴出口流量参数对不同类型喷嘴射流的湍流特性和噪声水平的影响
2. Simulation of Noise Generation in Near-Nozzle Region of a Chevron Nozzle Jet [J] . Ali Uzun, M. Yousuff Hussaini AIAA Journal . 2009,第8期

机译：人字形喷嘴射流近喷嘴区域噪声产生的模拟
3. Reprint of: Jet Noise Simulations for Realistic Jet Nozzle Geometries [J] . Philip J. Morris, Yongle Du, Kursat Kara Procedia IUTAM . 2010,第2aPartaB期

机译：转载：真实的喷嘴几何形状的喷嘴噪声模拟
4. Detect Nozzle Deformation by JTFA Pattern of Jet Noise: Assessment of the Procedure [C] . Xu Qiang, SPIE-The International Society for Optical Engineering Conference on Sensors for Propulsion Measurement Applications . 2006

机译：通过JTFA模式检测喷嘴变形的喷射噪音：程序评估
5. Experimental investigation of noise reduction in supersonic jets due to jet rotation and to nozzle geometry changes. [D] . Algattus, Said S. 1999

机译：超音速喷气机由于喷气旋转和喷嘴几何形状变化而产生的降噪实验研究。
6. Effects of Y-Jet Nozzle Mixing Chamber Length and the GLR on Spatial Asymmetric Spray [O] . Sang Ji Lee, Ji Yeop Kim, Jung Goo Hong, 2021

机译：Y喷嘴喷嘴混合室长度与GLR对空间不对称喷雾的影响
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Detect Nozzle Deformation by JTFA Pattern of Jet Noise: Assessment of the Procedure

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