基于反射场投影主动lamb波损伤监测与评估-active lamb wave damage monitoring and evaluation based on reflection field projection.docxVIP

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基于反射场投影主动lamb波损伤监测与评估-active lamb wave damage monitoring and evaluation based on reflection field projection.docx

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基于反射场投影主动lamb波损伤监测与评估-active lamb wave damage monitoring and evaluation based on reflection field projection

AbstractStructural health monitoring is a hot topic both in engineering and academic domain, because it is meaningful to ensure the structural safety and reduce the disaster or the loss of personnel property. And damage monitoring and evaluation technology is an important content and one of the key problems of structural health monitoring. Lamb wave reflection field projection method was analyzed theoretically based on the influence of damage on Lamb wave propagation , and it was validated experimentally in typical damage monitoring and evaluation.The main works in this dissertation include:The concept of structural health monitoring was presented. The application and recent development were summarized. Damage evaluation technology was especially introduced and described.The basic concept of active monitoring technique based on Lamb wave was discussed. The Lamb wave propagation in structure was studied theoretically. Signal processing methods on Lamb wave structural responses were also mentioned. Based on the analysis of relationship between the length of one-dimensional crack damage and the reflection field of Lamb wave,damage evaluation method based on the Lamb wave reflection field was proposed.The realizing technology of damage monitoring and evaluation based on Lamb wave reflection field projection was analyzed and validated experimentally. After Lamb wave monitoring signal was activated in the aluminum plate, Lamb wave structural responses were collected through linear sensor network, and the energy envelope of structural responses using Hilbert was extracted. The reflection field of Lamb wave was reconstructed at the location of the corresponding sensors based on compensation method for Lamb wave attenuation. It can be used to further monitor and evaluate one-dimensional crack damage.(4) The location and evaluation of unknown direction crack damage based on phased array theory was researched further. Simple two-dimensional damage monitoring and eva