基于改进HHT的水中爆炸冲击波信号时频特性分析方法

Time-frequencyrepresentationanalysisinunderwaterexplosiveshockwave signalsbasedonanimprovedHHTmethod

摘要: 根据水中爆炸冲击波信号的特征,利用希尔伯特-黄变换(HHT)处理非平稳信号的优势,提出了一种结合小波分解及相关系数筛选的改进HHT方法。该方法首先通过小波分解将信号分为高频部分和低频部分,然后利用相关系数对固有模态函数(IMF)分量进行筛选。理论与实践表明,改进的HHT 方法能够有效、准确地对水中爆炸冲击波信号的时频信息进行分析。
- 爆炸力学 /
- 改进HHT\HHT能量分布时频图 /
- 爆炸冲击波信号
Abstract: Basedonthecharactersofunderwaterexplosionshockwaves,animprovedHilbert-Huang transform (HHT)methodwasproposedbytakingtheadvantageofHHTinprocessingnon-stationarysignalsandcombiningwaveletdecompositionandcorrelationcoefficientfiltering. Intheimproved HHT method,firstsignalsaredividedintohigh-frequencysignalsandlow-frequencysignalsbywaveletdecomposition, andthenintrinsicmodefunction(IMF)componentsarefilteredbycorrelationcoefficients. Resultsshowthattheimproved HHT methodcanbeappliedtoeffectivelyanalyzethe time-frequencyinformationofunderwaterexplosionshockwavesignals.
- mechanicsofexplosion /
- improvedHHT /
- time-frequencyrepresentation