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arXiv 0810.2643stat.COstat.AP
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有限元模型修正的贝叶斯证据

Bayesian evidence for finite element model updating

Linda Mthembu, Tshilidzi Marwala, Michael I. Friswell, Sondipon Adhikari

摘要:

本文考虑有限元模型修正中的模型选择问题。考虑到有限元修正模型可以设计成多种修正参数,本文提出了用贝叶斯证据统计量来评估各修正模型的概率。这使得有可能然后评估在初始FE模型的更新中对替代更新参数的需要。模型证据的比较使用贝叶斯因子,这是证据的比率。Jeffrey量表用于确定模型中的差异。贝叶斯证据的计算是通过整合的数据的可能性给定的模型及其参数的先验模型参数空间使用新的嵌套抽样算法。嵌套算法通过在采样区域上使用硬似然值约束对该似然分布进行采样,同时提供更新模型参数的后验样本作为副产品。这种方法被用来计算一些合理的有限元模型的证据。

英文摘要:

This paper considers the problem of model selection within the context of finite element model updating. Given that a number of FEM updating models, with different updating parameters, can be designed, this paper proposes using the Bayesian evidence statistic to assess the probability of each updating model. This makes it possible then to evaluate the need for alternative updating parameters in the updating of the initial FE model. The model evidences are compared using the Bayes factor, which is the ratio of evidences. The Jeffrey scale is used to determine the differences in the models. The Bayesian evidence is calculated by integrating the likelihood of the data given the model and its parameters over the a priori model parameter space using the new nested sampling algorithm. The nested algorithm samples this likelihood distribution by using a hard likelihood-value constraint on the sampling region while providing the posterior samples of the updating model parameters as a by-product. This method is used to calculate the evidence of a number of plausible finite element models.

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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