基于频散补偿与路径-波速映射的损伤成像
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TB330.1 TH878

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国家自然科学基金重点项目(51635008)、江苏省重点研发计划(BE2018123)、机械结构力学及控制国家重点实验室(南京航空航天大学)自主研究课题 (MCMS0517K01)项目资助


Damage imaging method based on dispersion compensation and pathwave velocity mapping for complex composites
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    摘要:

    现有损伤成像算法应用于真实复杂的航空结构时,由于结构的各向异性、复杂边界反射以及导波自身频散特性的影响,成像效果往往较差,应用时误差较大,甚至不能成像。针对上述问题,提出了一种基于频散补偿与路径波速映射的结构损伤成像方法,首先针对各向异性影响下的结构实现损伤散射波包的频散补偿,以优化导波幅值特征,其次基于路径波速映射法解决各向异性所带来的导波时差获取误差大的问题。所提方法在含有加筋和开口的复合材料结构上进行了验证,结果显示损伤成像的准确率得到了明显优化。

    Abstract:

    When existing damage imaging algorithms are applied to real complex aeronautical structures, due to the influences of anisotropy of structures, complex boundary reflection and the dispersion characteristics of guided waves, the imaging result is often poor, and the application error is large, or the damage even can not be imaged. To solve the above problems, a structural damage imaging method based on dispersion compensation and pathwave velocity mapping is proposed. Firstly, the dispersion compensation of the scattered wave packet of damage under the influence of anisotropy is applied to optimize the characteristics of guided wave amplitude. Secondly, the problem of large errors of the time of flight caused by structural anisotropy is solved based on pathwave velocity mapping method. The imaging method is validated on the composite structures with stiffeners and openings, and the accuracy of damage imaging is obviously improved.

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陶静雅,袁慎芳.基于频散补偿与路径-波速映射的损伤成像[J].仪器仪表学报,2019,40(4):207-215

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  • 在线发布日期: 2022-01-17
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