arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1908.06326cs.LGcs.CVcs.NE
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悬臂梁结构健康监测案例研究--基于贝叶斯神经网络AND深度学习

Structural Health Monitoring of Cantilever Beam, a Case Study -- Using Bayesian Neural Network AND Deep Learning

Indian Institute of Space Science & Technology(印度空间科学与技术学院);Vikram Sarabhai Space Centre(维克拉姆·萨拉巴伊空间中心)

Rahul Vashisht, H. Viji, T. Sundararajan, D. Mohankumar, S. Sumitra

摘要:

机器学习算法的发展为基于振动的结构健康监测(SHM)开辟了广阔的前景。基于振动的SHM是基于损伤会改变动态特性的事实,即,结构的结构响应、频率、振型等。使用传感器测量的响应本质上是高维的,可以使用机器学习技术智能地分析这些响应以进行损伤评估。采用多层架构的神经网络是能够捕获输入-输出对之间的复杂关系但不考虑网络输出中的不确定性的表达模型。贝叶斯神经网络(Bayesian Neural Network,BNN)是指用后验推理扩展标准网络。它是一个权值具有先验分布的神经网络。像CNN(卷积神经网络)和LSTM(长短期记忆)这样的深度学习架构是从高维数据中进行表示学习的良好候选者。与多层神经网络相比,使用CNN的优势在于它们是良好的特征提取器和分类器,这消除了生成手工设计特征的需要。LSTM网络主要用于序列建模。本文提出了一种基于贝叶斯多层感知器和深度学习的梁式结构损伤检测和位置识别方法。使用有限元分析模拟的原始频率响应数据被馈送作为网络的输入。作为其中的一部分,在悬臂梁中产生了一系列模拟的频率响应,涉及不同的损坏情况。该案例研究表明了上述方法的有效性,以可接受的误差率来预测弯曲刚度。

英文摘要:

The advancement of machine learning algorithms has opened a wide scope for vibration-based SHM (Structural Health Monitoring). Vibration-based SHM is based on the fact that damage will alter the dynamic properties viz., structural response, frequencies, mode shapes, etc of the structure. The responses measured using sensors, which are high dimensional in nature, can be intelligently analyzed using machine learning techniques for damage assessment. Neural networks employing multilayer architectures are expressive models capable of capturing complex relationships between input-output pairs but do not account for uncertainty in network outputs. A BNN (Bayesian Neural Network) refers to extending standard networks with posterior inference. It is a neural network with a prior distribution on its weights. Deep learning architectures like CNN (Convolutional neural network) and LSTM(Long Short Term Memory) are good candidates for representation learning from high dimensional data. The advantage of using CNN over multi-layer neural networks is that they are good feature extractors as well as classifiers, which eliminates the need for generating hand-engineered features. LSTM networks are mainly used for sequence modeling. This paper presents both a Bayesian multi-layer perceptron and deep learning-based approach for damage detection and location identification in beam-like structures. Raw frequency response data simulated using finite element analysis is fed as the input of the network. As part of this, frequency response was generated for a series of simulations in the cantilever beam involving different damage scenarios. This case study shows the effectiveness of the above approaches to predict bending rigidity with an acceptable error rate.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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