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Journal of Projectiles, Rockets, Missiles and Guidance >

2012 , Vol. 32 >Issue 3: 145 - 147,151

DOI: https://doi.org/10.15892/j.cnki.djzdxb.2012.03.024

ROCKETS TECHNOLOGY

Time-frequency Analysis of Test Data from Complex Noise of Rocket Engine Jet

  • ZHOU Fan ,
  • JIANG Yi ,
  • ZHANG Xuewen ,
  • HAO Jiguang
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  • School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China

Received date: 2011-07-29

  Online published: 2025-05-29

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Abstract

In order to predict characteristics of high-thrust rocket launching noise, a sub-scale solid engine was chosen for experiment. The wavelet transform and FFT methods were used in processing experimental noise data, the following results can be found out: the low-frequency and high-amplitude shock components are found in the engine's working time, and their amplitude and frequency are very different from classic jet broadband noise; The filtered noise spectrum is typical turbulent broadband noise spectrum, and the sound efficiency of jet noise is 0.51%, which is in good agreement with empirical data of rocket launching, so it can be concluded that shock noise is not a part of jet noise.

Key words： gas jet; noise; wavelet transform; FFT; shock wave

Cite this article

ZHOU Fan , JIANG Yi , ZHANG Xuewen , HAO Jiguang . Time-frequency Analysis of Test Data from Complex Noise of Rocket Engine Jet[J]. Journal of Projectiles, Rockets, Missiles and Guidance, 2012 , 32(3) : 145 -147,151 . DOI: 10.15892/j.cnki.djzdxb.2012.03.024

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