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Experimental and numerical study on the thermal control strategy for a gas foil bearing enhanced with thermoelectric modules

机译:热电模块增强气体箔轴承热控制策略的实验与数值研究

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摘要

The authors report the method for temperature gradient control in gas foil bearings with the use of thermoelectric modules. The paper presents a prototype installation consisting of a gas foil bearing with integrated 36 thermoelectric modules, an electric spindle, measurement and control system. The results of a preliminary qualitative and quantitative assessment of the investigated temperature gradient control are shown, making use of the carried out numerical simulations. Steady state thermal analyses were performed for the defined control currents assigned to the Peltier modules. The metamodeling technique improved the search for a suboptimal choice on the control currents values in terms of temperature gradient control efficiency. Consideration of simultaneous forward and backward heat pumping directions for the selected thermoelectric modules improved temperature gradient reduction by additional 10%. Moreover, the paper is complemented with the results of an experimental test performed for a prototype installation of a gas foil bearing. A straightforward adaptive algorithm, dedicated to control thermal parameters of the bearing's foil, was successfully tested. The control algorithm allowed for a significant temperature gradient reduction, however considerable oscillations in the temperature profile were observed. In order to eliminate these oscillations, a PID controller was implemented into the algorithm. Consequently, the magnitude of the temperature oscillations was reduced by 60%.
机译:作者报告了使用热电模块对气箔轴承进行温度梯度控制的方法。本文介绍了一个原型装置,该装置包括带有集成36个热电模块的气箔轴承,电主轴,测量和控制系统。给出了利用所进行的数值模拟对所研究的温度梯度控制进行初步定性和定量评估的结果。对分配给Peltier模块的定义的控制电流进行了稳态热分析。根据温度梯度控制效率,元建模技术改进了对控制电流值的次优选择的搜索。考虑到所选热电模块同时进行正向和反向热泵方向,温度梯度降低了10%。此外,本文还对针对气体箔轴承的原型安装进行的实验测试结果进行了补充。成功地测试了一种专用于控制轴承箔片热参数的直接自适应算法。该控制算法允许显着降低温度梯度,但是观察到温度曲线中的明显振荡。为了消除这些振荡,在算法中实现了PID控制器。因此,温度振荡的幅度降低了60%。

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