杨 懿,郭亚男,王永鹏,陈文丽,贾志杰,吕守国.小波包变换在火箭发动机脉动压力分析中的应用[J].测控技术,2021,40(9):58-64
小波包变换在火箭发动机脉动压力分析中的应用
Application of Wavelet Packet Transform in Analysis of Fluctuating Pressure of Rocket Engine
  
DOI:10.19708/j.ckjs.2021.09.009
中文关键词:  火箭发动机  脉动压力  小波包变换  去噪  树状分解
英文关键词:rocket engine  fluctuating pressure  wavelet packet transform  denoising  tree decomposition
基金项目:
作者单位
杨 懿 北京航天试验技术研究所 
郭亚男 北京航天试验技术研究所 
王永鹏 北京航天试验技术研究所 
陈文丽 北京航天试验技术研究所 
贾志杰 北京航天试验技术研究所 
吕守国 北京航天试验技术研究所 
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中文摘要:
      在火箭发动机试验中,燃烧室脉动压力数据是考察推进剂燃烧状态的重要依据。通过对脉动压力数据特征分析,利用小波包变换多分辨分析的特点,以信噪比作为衡量标准,采用小波包自选阈值法对脉动压力数据进行去噪。通过与稳态参数数据的对比验证了去噪结果的准确性。采用Wicherhauser树状分解和Shannon信息熵基波选择标准等方法对脉动压力数据进行分频段分析。根据结果中各频段内的系数特征能够直观分析脉动压力在各频带中的能量分布。通过对脉动压力数据和相应振动测点数据的频谱分析,验证了分析结果的有效性。该方法在其他型号发动机和组合件试验脉动压力数据分析中有重要的应用和推广价值。
英文摘要:
      In rocket engine test,the data of pulsating pressure in combustion chamber is an important basis to investigate the combustion state of propellant.By analyzing the characteristics of fluctuating pressure data,using the characteristics of multi-resolution analysis of wavelet packet transform,taking the signal-to-noise ratio as the standard,the wavelet packet self selected threshold method is used to denoise the fluctuating pressure data.The accuracy of the denoising results is verified by comparing with the steady-state parameter data.The methods of Wicherhauser tree decomposition and Shannon information entropy fundamental wave selection standard are used to analyze the fluctuating pressure data in frequency band.According to the coefficient characteristics in each frequency band,the energy distribution of fluctuating pressure in each frequency band can be analyzed intuitively.The validity of the analysis results is verified by the spectrum analysis of the fluctuating pressure data and the corresponding vibration measurement point data.This method has important application and popularization value in the analysis of pulsating pressure data of other types of engines and assemblies.
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