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arXiv 1602.06202stat.ME
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计算机模型的非参数函数校正

Nonparametric Functional Calibration of Computer Models

D. Andrew Brown, Sez Atamturktur

摘要:

计算机模型校准中的标准方法将校准参数视为贯穿控制输入域的常数。在许多应用中,系统变化可能导致校准参数的最佳值在不同设置之间变化。如果在代码中没有考虑到这种变化,计算机模型可能会变得不合适。在这篇文章中,我们提出了一个框架,用于建模的校准参数作为控制输入的函数,以占在这方面的计算机模型的不完整的系统表示,同时允许由先前的专家意见所施加的可能的约束。我们演示了如何不适当的建模假设可以误导研究人员认为校准模型是需要一个经验的差异项时,它只需要允许的功能依赖的校准参数的输入。我们将我们的方法应用到粘塑性自洽材料的塑性变形中,已知临界剪切应力随温度变化。

英文摘要:

Standard methods in computer model calibration treat the calibration parameters as constant throughout the domain of control inputs. In many applications, systematic variation may cause the best values for the calibration parameters to change between different settings. When not accounted for in the code, this variation can make the computer model inadequate. In this article, we propose a framework for modeling the calibration parameters as functions of the control inputs to account for a computer model's incomplete system representation in this regard while simultaneously allowing for possible constraints imposed by prior expert opinion. We demonstrate how inappropriate modeling assumptions can mislead a researcher into thinking a calibrated model is in need of an empirical discrepancy term when it is only needed to allow for a functional dependence of the calibration parameters on the inputs. We apply our approach to plastic deformation of a visco-plastic self-consistent material in which the critical resolved shear stress is known to vary with temperature.

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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