Hilbert边际谱在框架结构损伤检测中的应用
首发时间:2010-01-12
摘要:提出了一种基于Hilbert边际谱的损伤检测方法,在Hilbert边际谱的基础上定义了特征幅值,并以损伤前后同一响应点位置特征幅值的相对变化量来计算用于进行结构损伤检测的损伤指标。由一个8层剪切框架结构的损伤检测仿真算例,获得了所提出的损伤指标与结构健康状态及损伤位置的对应关系,进而提出了利用该损伤指标来检测并定位框架结构损伤的步骤。最后,使用一个8层剪切框架结构的损伤检测实验说明本文方法可以准确识别出框架结构的健康状态以及损伤位置。
关键词: Hilbert边际谱 损伤检测 经验模分解 Hilbert-Huang变换
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Application of the Hilbert marginal spectrum in damage detection of frame structure
Abstract:The feature amplitude based on the Hilbert marginal spectrum is introduced. The relative change of the feature amplitude of the same position before and after damage is used to calculate the damage index to detect the damage of the frame structure. Damage detection procedure, which detects the existence of the damage and the damage location, is got from damage detection numerical simulation of an eight-story frame structure and validated using damage detection experiment. Both numerical simulation and experiment results show that the proposed method can detect and locate the damage efficiently.
Keywords: Hilbert marginal spectrum damage detection Empirical Mode Decomposition Hilbert-Huang transform
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