A local average method for stochastic thermal analysis under heat conduction conditions

A local average method for stochastic thermal analysis under heat conduction conditions
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热传导条件下随机热分析的局部平均法

DOI:
10.2298/tsci170113181w
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发表时间:
2019
期刊:
影响因子:
1.7
通讯作者:
Yin Leijian
Yin Leijian
中科院分区:
工程技术4区
文献类型:
--
作者:
Wang Tao;Zhou Guoqing;Wang Jianzhou;Yin Leijian

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本文提出了一种新的二维随机场三角形离散化方法,导出了任意两个三角形随机场元的协方差计算公式。与四边形离散方法相比,它的主要优点是能将三角形局部平均法与三角形有限元法完美地联合收割机结合起来。同时,对应关系更清晰,计算机程序更简单.基于新的局部平均法,采用蒙特-卡罗法对热传导条件下岩土结构的随机温度场进行了数值分析,给出了数学期望矩阵和标准差矩阵的计算公式。用Matrix Laboratory软件编制了一系列计算机程序。通过数值算例验证了不确定参数的随机效应,并将所得结果与四边形局部平均法的结果进行了比较,验证了该方法的准确性.
In this paper, a new triangular discretization method for 2-D random field is proposed, and the computational formula of the covariance for any two triangular random field elements is developed. Its main advantage, compared to the quadrilateral discretization method, is that triangular local average method can perfectly combine with the triangular finite element method. Also, the corresponding relation is clearer and the computer codes are simpler. Based on the new local average method, a numerical analysis for random temperature field of geotechnical structures under heat conduction conditions is presented by the Monte-Carlo method, and the computational formulas of mathematical expectation matrix and standard deviation matrix are provided. A series of computer codes have been compiled by Matrix Laboratory software. A numerical example is presented to demonstrate the random effects of uncertain parameters, and the accurateness of the proposed approach is proven by comparing these results with the results derived from quadrilateral local average method.
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