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摘要: 基于Lamb波和匹配追踪算法,提出了一种损伤成像方法,对复合材料冲击损伤进行在线的连续 监测。首先针对Lamb波监测的特点,提出了匹配追踪方法的快速实现方案,将信号分解为多个Chirplet原 子的线性组合,建立了Lamb的弥散效应与Chirplet原子的调频斜率之间的关系,模拟结果表明Chirplet原 子能准确地匹配失真变形的窄带脉冲信号;根据损伤前与损伤后的信号差别,提出了一种基于Lamb波能量 特征差异提取的损伤指标;进一步采用改进的RAPID算法进行损伤成像,将损伤情况可视化。结果表明所 提方法可行和有效。Abstract: AdamageimagingmethodusingLambwaveandmatchingpursuitmethodforcontinuous on-linemonitoringofcompositewasproposed.First,asignalprocessingmethodisdevelopedusing matchingpursuits.ItcandecomposeLambsignalsintoalinearexpansionofseveralchirpletatoms withafastoperationspeed.Second,therelationshipbetweenLambwavesdispersionandchirplets chirprateisdeveloped.Itshowsthatthechirpletatomcanmatchthedispersionpulseaccurately,and itcanbeusedtoidentifythemodesofLambwaves.Third,accordingtothesignaldifferencebefore andafterdamage,adamageindexcanbegetfromthedifferencesintheenergycharacteristicsoflamb wave.TheimagethatindicatesthedamagecanbeobtainedbytheRAPIDalgorithm.Theexperimentalresultsdemonstratetheapplicabilityandeffectivenessoftheproposedmethod.
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Key words:
- solid mechanics /
- damageimaging /
- matchingpursuit /
- composite materials /
- structural healthmonitoring
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