高真空多层绝热结构层间压力反演吴昊，谭宏博*，许张良（西安交通大学制冷与低温工程系，西安710049）摘要：高真空是液氢温区多层绝热的基础，通过不同抽气工艺获得的多层绝热材料层间压力分布，使绝热结构性能有显著差异。为了预测多层绝热材料层间压力分布，并作为抽气工艺的评价依据，基于逐层传热学模型，首先通过理论计算建立由不同层间压力分布对应的温度分布组成样本集，应用截断奇异值分解获得其正交基。再根据某绝热结构样品实测的多层材料层间温度分布，采用吉洪诺夫正则化方法对正交基系数进行回归预测，重构层间压力分布，即反演获得了多层绝热材料的层间压力。通过与给定算例的对比验证，结果表明，采用本方法可以从易于精确测量的层间温度分布反演获得层间压力分布，更精确地预测多层绝热材料的性能。为评价、比较和优化液氢容器高真空多层绝热结构的抽气工艺提供参考。关键词：多层绝热；层间压力；截断奇异值分解；吉洪诺夫正则化中图分类号：TB61文献标志码：A文章编号：1006-7086（2023）02-0121-08DOI：10.3969/j.issn.1006-7086.2023.02.004InverseIdentificationoftheResidualGasPressureDistributioninHighVacuumMulti-layerInsulationWUHao，TANHongbo*，XUZhangliang（Departmentofrefrigerationandcryogenicengineering，Xi’anJiaotongUniversity，Xi’an710049，China）Abstract：Highvacuumisabasicconditionforthemultilayerinsulationattheliquidhydrogentemperaturezone，andtheresidualgaspressuredistributioninmultilayerinsulationmaterials（MLIs）obtainedbydifferentevacuationprocessesresultsintheobviousdifferentperformanceoftheinsulationstructure.Inordertopredicttheresidualgaspressuredistribu‐tionofMLIsanduseitasthebasisfortheevaluationofdifferentevacuatingprocesses，thisstudyisbasedonthelayer-by-layerheattransfermodel.Asamplesetcomposedoftemperaturedistributionscorrespondingtodifferentresidualgaspres‐suredistributionsofMLIsisestablishedbytheoreticalcalculation.Theorthogonalbasiswasobtainedbytruncatedsingu‐larvaluedecomposition，andthentheorthogonalbasiscoefficientwaspredictedbyTikhonovregularizationmethodac‐cordingtothemeasuredtemperaturedistributionoftheMLIs，andtheresidualgaspressuredistributionisreconstructedfi‐nally.Itisvalidatedby...
