Probability distribution of decay rate: a statistical time-domain damping parameter for structural damage identification
Probability distribution of decay rate: a statistical time-domain damping parameter for structural damage identification
复制标题
DOI：
10.1177/1475921718817336
复制
发表时间：
2019-01-01
影响因子：
6.6
通讯作者：
Wang, Ying
中科院分区：
文献类型：
--
作者：
Ay, Ali M.;Khoo, Suiyang;Wang, Ying
本文提出了一种基于振动的损伤识别新方法-衰减率概率分布法。通过引入一个统计框架，衰减率的概率分布方法估计损伤引起的变化，在整体阻尼行为的自由振动的动态系统。利用自由振动脉冲响应数据，构造了局部极大极小点的一维数据集。然后对该数据集进行统计分析，以获得损伤敏感参数。它表明，通过使用一个统计分析框架，一些增强达到的鲁棒性和宽大估计显着的非线性特性的整体阻尼。在实验室中进行了冲击锤试验，以验证所提出的衰减率概率分布方法的有效性。试验是在一个缩尺模型钢沃伦桁架桥结构上进行的，该结构受到螺栓连接失效的影响。衰减率概率分布法与标准试验模态分析法的对比结果表明，衰减率概率分布法对复杂结构的损伤识别是有效的，特别是对真实的试验数据和钢框架结构的损伤识别。
This article proposes a novel vibration-based damage identification method, named the probability distribution of decay rate. By introducing a statistical framework, the probability distribution of decay rate method estimates the damage-induced changes in overall damping behaviour of a free-vibration dynamic system. Utilising free-vibration impulse response data, a one-dimensional data set of local maxima-minima points is constructed. A statistical analysis of this data set is then performed to derive damage-sensitive parameters. It is demonstrated that through the use of a statistical analysis framework, a number of enhancements are attained in terms of both robustness and leniency in estimating the significantly nonlinear property of overall damping. An impact hammer test is conducted in the laboratory to verify the efficacy of the proposed probability distribution of decay rate method. The test was performed on a scale-model steel Warren-truss bridge structure, subjected to bolt-connection failures. The comparison results between the probability distribution of decay rate method and the standard experimental modal analysis method confirm that the former is effective for damage identification of complex structures, particularly with real experimental data and steel-frame structure assemblies.