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非接触式动态响应测量在预测高阻尼结构中小尺寸或隐藏损伤方面的潜力。

Potential of Non-Contact Dynamic Response Measurements for Predicting Small Size or Hidden Damages in Highly Damped Structures.

作者信息

Azouz Zakrya, Honarvar Shakibaei Asli Barmak, Khan Muhammad

机构信息

Centre for Life-Cycle Engineering and Management, Faculty of Engineering and Applied Sciences, Cranfield University, Cranfield, Bedfordshire MK43 0AL, UK.

出版信息

Sensors (Basel). 2024 Sep 10;24(18):5871. doi: 10.3390/s24185871.

DOI:10.3390/s24185871
PMID:39338616
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11435927/
Abstract

Vibration-based structural health monitoring (SHM) is essential for evaluating structural integrity. Traditional methods using contact vibration sensors like accelerometers have limitations in accessibility, coverage, and impact on structural dynamics. Recent digital advancements offer new solutions through high-speed camera-based measurements. This study explores how camera settings (speed and resolution) influence the accuracy of dynamic response measurements for detecting small cracks in damped cantilever beams. Different beam thicknesses affect damping, altering dynamic response parameters such as frequency and amplitude, which are crucial for damage quantification. Experiments were conducted on 3D-printed Acrylonitrile Butadiene Styrene (ABS) cantilever beams with varying crack depth ratios from 0% to 60% of the beam thickness. The study utilised the Canny edge detection technique and Fast Fourier Transform to analyse vibration behaviour captured by cameras at different settings. The results show an optimal set of camera resolutions and frame rates for accurately capturing dynamic responses. Empirical models based on four image resolutions were validated against experimental data, achieving over 98% accuracy for predicting the natural frequency and around 90% for resonance amplitude. The optimal frame rate for measuring natural frequency and amplitude was found to be 2.4 times the beam's natural frequency. The findings provide a method for damage assessment by establishing a relationship between crack depth, beam thickness, and damping ratio.

摘要

基于振动的结构健康监测（SHM）对于评估结构完整性至关重要。使用加速度计等接触式振动传感器的传统方法在可达性、覆盖范围以及对结构动力学的影响方面存在局限性。最近的数字技术进步通过基于高速相机的测量提供了新的解决方案。本研究探讨了相机设置（速度和分辨率）如何影响用于检测阻尼悬臂梁中小裂纹的动态响应测量的准确性。不同的梁厚度会影响阻尼，改变频率和振幅等动态响应参数，这些参数对于损伤量化至关重要。对3D打印的丙烯腈丁二烯苯乙烯（ABS）悬臂梁进行了实验，裂纹深度与梁厚度的比例从0%到60%不等。该研究利用Canny边缘检测技术和快速傅里叶变换来分析在不同设置下相机捕获的振动行为。结果显示了一组用于准确捕获动态响应的最佳相机分辨率和帧率。基于四种图像分辨率的经验模型根据实验数据进行了验证，预测固有频率的准确率超过98%，共振振幅的准确率约为90%。发现测量固有频率和振幅的最佳帧率是梁固有频率的2.4倍。这些发现通过建立裂纹深度、梁厚度和阻尼比之间的关系提供了一种损伤评估方法。

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