Time-frequencycharacteristicsofshockresponsesofunderwatertarget tounderwaterexplosion
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摘要: 基于某水下目标的抗水下爆炸实验数据,利用小波变换良好的时频局部化性质对监测的水下目标 内部装置冲击加速度信号进行时频特征分析,得到了不同频带上冲击信号振动分量的时间历程曲线和能量 分布。结果表明,基于冲击信号小波时频特征分析的频带能量可以同时反映冲击振动的强度、频率和持续时 间对目标损伤的影响,同时结合不同频带的时间历程曲线可以获得冲击波和二次压力波在不同频带上的分 布和衰减的细节信息,由此可确定冲击波和二次压力波各自对目标毁伤的影响。Abstract: Basedontheexperimentaldataofanunderwatertargetsubjectedtounderwaterexplosion, thetime-frequencycharacteristicsofthemonitoredinterioraccelerationsignalswerestudiedbymeans ofwaveletanalysiswithhighresolvabilityandlocalization.Byusingthesesignals,theaccelerationtimecurvesandtheenergydistributionsindifferentblastingfrequencybandswereobtained. Theanalyzedresultsshowthatthewaveletenergyinagivenfrequencybandcancoinstantaneouslyreflectthe influencesofvibrationstrength,frequency,anddurationonthedamageeffectoftheunderwatertarget. Andthedistributionandattenuationdetailinformationoftheshockwaveandsecondarypressure waveindifferentfrequencybandswasobtainedbycombiningtheacceleration-timecurvesindifferent blastingfrequencybands.Thereby,theinfluencesoftheshockwaveandthesecondarypressurewave onthedamageeffectoftheunderwatertargetcanbeassessed,respectively.
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