基于HHT的导弹发射冲击时频谱分析  

Time Frequency Spectrum Analysis of Shock Signals Generated by Missile Launching Based on the Hilbert-Huang Transform

作　　者：封雷 卫炜[1] 刘曦 高旭 巩祥瑞 FENG Lei;WEI Wei;LIU Xi;GAO Xu;GONG Xiangrui(Xi′an Institute of Modern Control Technology Xi′an,710065,China)

机构地区：[1]西安现代控制技术研究所

出　　处：《振动．测试与诊断》2020年第1期148-154,208,209,共9页Journal of Vibration,Measurement & Diagnosis

基　　金：国防科技工业技术基础资助项目(JSZL2017208B006)

摘　　要：为研究弹载部件在导弹发射过程中的冲击响应及冲击信号的传递特性,进行了基于希尔伯特-黄变换(Hilbert-Huang transform,简称HHT)的导弹发射冲击时频谱分析。由于经验模态分解(empirical mode decomposition,简称EMD)结果易受白噪声的影响,研究了总体经验模态分解(ensemble empirical mode decomposition,简称EEMD)技术。以弹体不同位置的实测冲击信号为对象,应用HHT技术进行分析,准确得到了导弹发射冲击信号的固有模态函数(intrinsic mode function,简称IMF)和时间-频率-能量谱特征,并研究了两次冲击的频率分布和各阶IMF与原始信号的相关性。结合边际谱分析对比了两个舱段能量在中低频和高频的传递特性,进一步验证了HHT方法在分析非线性和非平稳冲击信号中的优越性。In order to study the shock response and the transmission characteristics of shock signals of missile parts during the missile launching,the time-frequency spectrum of the shock signals of the missile launching based on Hilbert-Huang transform has been analyzed.As empirical mode decomposition(EMD)is susceptible to white noise,ensemble empirical mode decomposition(EEMD)is researched.The Hilbert-Huang transform(HHT)is used to analyze the real shock signal from different points of the missile,the intrinsic mode function(IMF)and the time-frequency-energy distribution of the shock signals have been showed by HHT exactly,and the frequency distribution of two shocks and the correlation between each order IMF and the original signal are studied.The frequency characteristics of energy transmission have been compared at low frequency and high frequency.Additionally,the superior performance of HHT method to analyze the non-linear and non-stationary shock signals has been verified.

关 键 词：导弹发射冲击 希尔伯特-黄变换 总体经验模态分解 时频谱分析 

分 类 号：TH113[机械工程—机械设计及理论] TN911.6[电子电信—通信与信息系统]