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首页> 外文期刊>Structure and Infrastructure Engineering >Wavelet packet based damage detection in beam-like structures without baseline modal parameters
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Wavelet packet based damage detection in beam-like structures without baseline modal parameters

机译：没有基线模态参数的梁状结构中基于小波包的损伤检测

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摘要

In this paper, a new approach for damage detection in beam-like structures is presented. The method can be used without the need for baseline modal parameters of the undamaged structure. Another advantage of the proposed method is that it can be implemented using a small number of sensors. In the proposed technique, the measured dynamic signals are decomposed into the wavelet packet decomposition (WPD) components, the power spectrum density (PSD) of each component is estimated and then a damage localisation indicator is computed to indicate the structural damage. The proposed method is firstly illustrated with a simulated beam and the identified damage is satisfactory with assumed damage. Then, the method is applied to a steel beam. The effect of damage location and the effects of wavelet type and the decomposition level are examined. The results show that the proposed method has great potential in crack detection of beam-like structures.
机译：在本文中，提出了一种在梁状结构中进行损伤检测的新方法。可以使用该方法，而无需使用未损坏结构的基准模态参数。所提出的方法的另一个优点是可以使用少量的传感器来实现。在提出的技术中，将测得的动态信号分解为小波包分解（WPD）分量，估计每个分量的功率谱密度（PSD），然后计算损伤定位指示器以指示结构损伤。首先用模拟光束说明了所提出的方法，所确定的损伤在假定损伤下是令人满意的。然后，将该方法应用于钢梁。研究了损伤位置的影响以及小波类型和分解水平的影响。结果表明，该方法在梁形结构裂缝检测中具有很大的潜力。

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