Shape variable foil bearings

气体润滑箔轴承用于小型高速机器，如压缩机，冷却涡轮机，小型燃气轮机，排气涡轮增压器，真空泵，以及纺织机械和高速精密主轴的轴承。箔轴承设计的目的是低升降速度，一方面在启动和停止期间的低磨损，以及最高可能的稳定性限制，这决定了轴承的最大转速。该项目将调查研究假设，即箔轴承形状的主动变化能够在启动期间的高负载能力状态（相对较低的起飞速度）和足够高的系统阻尼状态之间切换，从而在高速下稳定运行。形状控制应通过智能材料的应用或集成来实现。第二个资助期的目的是实验验证在高负载能力状态和足够高系统阻尼状态之间的有效切换。

Gas-lubricated foil bearings are used for small high-speed machines like compressors, cooling turbines, small gas turbines, exhaust turbochargers, vacuum pumps, as well as bearing for textile machines and high speed precision spindles. The aim of the design of foil bearings are low lift-off speeds on the one hand side for low wear during start-up and stop, and the highest possible limit of stability which determines the maximum rotational speed for the bearing.The project will investigate the research hypothesis that an active variation of the shape in foil bearings enables the switch between a state of high load capacity during start-up (with related low lift-off speed) and a state of sufficient high system damping for a stable operation at high speeds. The shape control should be realizable through the application or integration of smart materials.The aim of the second funding period is the experimental verification of the effective switch between a state of high load capacity and a state of sufficient high system damping .