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工程力学  2015 

考虑温变效应的热物性参数RBF辨识方法

DOI: 10.6052/j.issn.1000-4750.2013.07.0677, PP. 205-212

Keywords: 温变系统,参数识别,代理模型,多目标优化,NSGA-II

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Abstract:

在稳态温度环境下,针对温变系统的参数识别问题进行了研究,提出了两种基于代理模型的热物性参数辨识方法:多目标全域法和分段等效法。前者在整个分析域内构建多种温度分布形式,将参数识别问题转化为多目标优化问题,引入代理模型与快速非支配排序遗传算法(NSGA-II)进行求解,在提高识别效率的基础上有效地保证了该方法的鲁棒性。后者通过将材料热物性参数按温度区间分段,建立了温度均方根残差和在区间段内代理模型,识别出每个子区间内的等效物性参数,并采用回归分析获得热物性参数随温度变化规律。通过典型算例对两种方法进行了验证,研究结果表明:两种识别方法都具有较好的识别精度,相对而言,全域识别方法具有更优的抗噪性,而分段识别则更便于实际操作。

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