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arXiv 1206.5015physics.data-anstat.ME
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基于贝叶斯网络的多物理场计算模型校正

Calibration of multi-physics computational models using Bayesian networks

You Ling, Joshua Mullins, Sankaran Mahadevan

摘要:

本文提出了一种基于贝叶斯网络的多物理场模型校正方法,将各种不确定性来源与计算模型和实验数据的信息相结合。我们采用肯尼迪和O 'Hagan(KOH)框架下的模型校准不确定性,并开发扩展到多物理模型和各种情况下的可用数据。任意不确定性(由于自然变异性)和认识不确定性(由于缺乏信息,包括数据不确定性和模型不确定性)都在校准过程中得到考虑。研究了多物理场模型贝叶斯校正的几个重要方面,包括:(1)利用不同形式的实验数据(例如,区间数据和时间序列数据);(2)当模型的解析表达式已知或未知时,确定模型参数的可辨识性;(3)共享公共参数的多个物理模型的校准,这使得能够有效地利用数据,特别是当实验资源有限时。提出了一种基于一阶泰勒级数展开的方法来确定哪些模型参数是可识别的。根据KOH框架,估计概率差异函数并将其添加到校准模型的预测中,试图考虑模型的不确定性。当有足够的数据可用于多个模型输入组合时,该差异函数被建模为高斯过程,并且当可用数据有限时,该差异函数被建模为随机变量。使用与微机电系统(MEMS)装置相关的两个应用实例来说明总体方法:(1)用时间序列数据校准电介质充电模型,以及(2)使用不同装置中的不同物理量的测量校准两个物理模型(吸合电压和蠕变)。

英文摘要:

This paper develops a Bayesian network-based method for the calibration of multi-physics models, integrating various sources of uncertainty with information from computational models and experimental data. We adopt the Kennedy and O'Hagan (KOH) framework for model calibration under uncertainty, and develop extensions to multi-physics models and various scenarios of available data. Both aleatoric uncertainty (due to natural variability) and epistemic uncertainty (due to lack of information, including data uncertainty and model uncertainty) are accounted for in the calibration process. Challenging aspects of Bayesian calibration for multi-physics models are investigated, including: (1) calibration with different forms of experimental data (e.g., interval data and time series data), (2) determination of the identifiability of model parameters when the analytical expression of model is known or unknown, (3) calibration of multiple physics models sharing common parameters, which enables efficient use of data especially when the experimental resources are limited. A first-order Taylor series expansion-based method is proposed to determine which model parameters are identifiable. Following the KOH framework, a probabilistic discrepancy function is estimated and added to the prediction of the calibrated model, attempting to account for model uncertainty. This discrepancy function is modeled as a Gaussian process when sufficient data are available for multiple model input combinations, and is modeled as a random variable when the available data are limited. The overall approach is illustrated using two application examples related to microelectromechanical system (MEMS) devices: (1) calibration of a dielectric charging model with time-series data, and (2) calibration of two physics models (pull-in voltage and creep) using measurements of different physical quantities in different devices.

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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