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arXiv 2307.06263cs.LGcs.SYeess.SY
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关于频率响应函数的分层贝叶斯建模

On the hierarchical Bayesian modelling of frequency response functions

University of Sheffield(谢菲尔德大学);University of Cambridge(剑桥大学)

T. A. Dardeno, K. Worden, N. Dervilis, R. S. Mills, L. A. Bull

AI总结:

本文提出一种分层贝叶斯方法,为直升机桨叶建立组合概率FRF模型,通过在群体与域级别同时学习分布来增强稀疏数据下的信息传递与泛化能力,从而解决SHM中的关键挑战。

摘要:

对于可能受益于数据集间信息共享的情况(例如相似结构的基于群体的结构健康监测 SHM),分层贝叶斯方法提供了一种有用的建模结构。分层贝叶斯模型同时在群体(或父级)和域级别学习统计分布,以增强参数间的统计强度。因此,参数估计中的方差得以减小,特别是在数据有限时。本文使用分层贝叶斯结构,为少量名义上相同的直升机桨叶开发了一个组合概率 FRF 模型,以支持稀疏数据背景下的信息传递。该建模方法还在传统的 SHM 背景下进行了演示,针对暴露于不同温度下的单个直升机桨叶,展示了在稀缺数据背景下,纳入基于物理的知识如何能够提高超出训练数据的泛化能力。这些模型通过适应表现为底层动态差异的良性变化,同时考虑(并利用)域之间的相似性,解决了 SHM 中的关键挑战。

英文摘要:

For situations that may benefit from information sharing among datasets, e.g., population-based SHM of similar structures, the hierarchical Bayesian approach provides a useful modelling structure. Hierarchical Bayesian models learn statistical distributions at the population (or parent) and the domain levels simultaneously, to bolster statistical strength among the parameters. As a result, variance is reduced among the parameter estimates, particularly when data are limited. In this paper, a combined probabilistic FRF model is developed for a small population of nominally-identical helicopter blades, using a hierarchical Bayesian structure, to support information transfer in the context of sparse data. The modelling approach is also demonstrated in a traditional SHM context, for a single helicopter blade exposed to varying temperatures, to show how the inclusion of physics-based knowledge can improve generalisation beyond the training data, in the context of scarce data. These models address critical challenges in SHM, by accommodating benign variations that present as differences in the underlying dynamics, while also considering (and utilising), the similarities among the domains.

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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