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作 者:李文俊[1] 杨靖贵 曲智旭 朱鹏程 刘水华 冯凯[1] LI Wenjun;YANG Jinggui;QU Zhixu;ZHU Pengcheng;LIU Shuihua;FENG Kai(State Key Laboratory Advanced Design and Manufacturing Technology for Vehicle,Hunan University,Changsha 410082,China)
机构地区:[1]湖南大学整车先进设计制造技术全国重点实验室,湖南长沙410082
出 处:《湖南大学学报(自然科学版)》2024年第10期77-88,共12页Journal of Hunan University:Natural Sciences
基 金:国家重点研发计划资助项目(2021YFF0603000)。
摘 要:针对超临界二氧化碳(SupercriticalCarbon Dioxide,S-CO_(2))润滑波箔型止推箔片气体动压轴承,通过反向传播(Back Propagation,BP)神经网络算法提出S-CO_(2)的物性模型,并考虑轴承工作时的非理想气体效应,提出考虑湍流效应气体润滑模型、箔片结构力学模型和气膜平均温升计算方法,对止推箔片气体动压轴承的静动态特性进行研究,并分析不同结构参数对箔片气体轴承静动态特性的影响规律.结果表明,本文提出的物性模型准确度高,相关系数高达99.997%.以S-CO_(2)为润滑介质的止推箔片气体动压轴承具有更高的承载力,且在适当范围内减小最小初始气膜厚度或增加膜厚比可以提高轴承的承载力.以S-CO_(2)为介质的止推箔片气体动压轴承的动态刚度系数和动态阻尼系数均远高于常温常压空气介质下的止推箔片气体动压轴承.随着最小初始气膜厚度减小,轴承的动态刚度系数和动态阻尼系数均迅速增加.For thrust gas foil bearings integrating Supercritical Carbon Dioxide(S-CO_(2))as the working medium,a Back Propagation(BP)neural network algorithm is employed to propose a physical property model for S-CO_(2).To account for the non-idea gas behavior in the bearing,models encompassing gas lubrication with turbulence effects,foil structural mechanics,and the calculation of the average gas film temperature are introduced.Static and dynamic characteristics of the thrust gas foil bearing are studied and contrasted with various lubricant media.The impact of diverse structural parameters on the static and dynamic attributes of the gas foil bearing is analyzed.Results indicate that the physical property model presented in this paper attains high accuracy,boasting a correlation coefficient of 99.997%.The thrust gas foil bearing lubricated with S-CO_(2) exhibits enhanced load-bearing capacity,with potential for further improvement by adjusting the minimum initial gas film thickness or increasing the film thickness ratio within a suitable range.The dynamic stiffness and damping coefficient of the thrust gas foil bearing utilizing S-CO_(2) significantly surpass those employing air as the medium,underscoring its superior dynamic characteristics.Furthermore,a reduction in the minimum initial film thickness leads to a rapid increase in the dynamic stiffness coefficients and damping coefficients of the bearing.
关 键 词:止推箔片气体动压轴承 超临界二氧化碳(S-CO_(2)) 反向传播神经网络 静态特性 动态特性
分 类 号:TH133.37[机械工程—机械制造及自动化]
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