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摘要: 首先介绍了小波分析与小波包分析的原理和特点,然后给出了实际的爆炸容器振动的实验测试结 果,最后应用小波包分析计算了其振动分量的时频分布情况,并对时频分析结果进行了讨论。分析结果表明, 爆炸容器的振动信号能量分布处于较宽的频带范围,振动能量随时间变化的发展出现剧烈的变化,隔震沟衰 减了信号主要频带范围内97%的能量。Abstract: Thewaveletpackettransform,inwhichthewaveletDB8waschosenasthebasisfunction, wasappliedtoanalyzethevibrationsignalsofa25-kg-TNT-equivalentexplosionvessel.Andtheprincipleandcharacteristicsofwaveletpacketanalysiswereintroducedandtheexperimentalvibrationaccelerationsignalsoftheexpl sionvesselwerepresented.Thetime-frequencydistributionsoftheexperimentalsignalswerecalculatedbythewaveletpacketmethod. Theresultsshowthattheenergy distributionofvibrationoftheexplosionvesselhasaverywidefrequencyrangeandfluctuatesintensely, andthequakeprooftrenchattenuatesapproximately97% ofthevibrationenergy.
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Key words:
- mechanicsofexplosion /
- time-frequencyanalysis /
- waveletpackettransform /
- explosion vessel
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