再生式液体发射药火炮燃烧室压力噪声分析  

Analysis of Pressure Noise in the Combustion Chamber of a Regenerative Liquid Propellant Gun

作　　者：董关 刘宁[1] 孙明亮[1] DONG Guan;LIU Ning;SUN Mingliang(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China)

机构地区：[1]南京理工大学机械工程学院,江苏南京210094

出　　处：《火炮发射与控制学报》2023年第3期67-72,共6页Journal of Gun Launch & Control

摘　　要：在之前压力振荡与燃烧室声学特性相关的研究工作中,对于振荡主频的分析存在不足,不能得到振荡主频在时域上的分布特性,因而不能够求解出准确的燃烧室声学特性。为解决这一问题,通过小波变换结合快速傅里叶分析,建立了一种液体发射药火炮压力信号的分析方法,该方法确定了燃烧室不同时段的主振频率范围,将各时段主频与时域作匹配,得到了各时段主频可能出现的时刻。结果表明,离散小波变换可以有效提取信号中的有用信息,通过快速傅里叶变换可以识别各段振荡主频,连续小波变换具有较好的时频局域化性质,可以为相关研究提供参考。In previous research on pressure oscillations and acoustic characteristics of combustion chambers,the analysis of the main frequency of oscillation is not enough to get the distribution characteristics of the main frequency in the time domain,the accurate acoustic characteristics of the combustion chambers cannot be obtained.In order to solve this problem,a method for analyzing the pressure signal of liquid propellant guns is established by combining wavelet transform and harmonic analysis,the main frequency of each time is matched with the time domain,and the possible moments at which main frequencies appear are obtained.The results show that the DWT can effectively extract useful information from the signal,the main frequency of each oscillation can be identified by the Fast Fourier Transform,and the CWT has better time frequency localization properties.The results can serve as a reference for related research.

关 键 词：再生式液体发射药火炮 压力振荡 噪声分析 小波变换 

分 类 号：TJ301[兵器科学与技术—火炮、自动武器与弹药工程]