【摘要】 在建立的气体轴承性能测试实验台上对新型弹性箔片气体动压径向轴承进行了起飞转速和承载能力的实验研究,并分别通过摩擦力矩和径向位移响应频谱两种方法分析了轴承的起飞转速。结果表明:轴承起飞后摩擦力矩逐渐减小并趋于稳定,且径向位移响应频谱图上只有较大的低倍频分量出现,高倍频分量和其它频率分量要小得多;两种分析方法得到的轴承起飞转速基本吻合;载荷越大,轴承和转子中心的偏心距越大;由于箔片弹性变形使卸载过程存在能量损失,同样载荷下卸载时的偏心距比加载时大。更多还原

【Abstract】 The test rig was established on the basis of exploiting foil air bearings to test the static and dynamic performances of new compliant aerodynamic foil air bearings.The experiments were performed to identify the lift off speed and load capacity of foil journal air bearings.The lift off speed of foil journal air bearing was analyzed through two methods:friction torque between the surface of rotor and bearing,and the spectrum of radial displacement response.The results of experiments shows that the friction torque reduces and reaches a steady value gradually after lift off because of rub-impact minishing.The spectrum figure is regular and there only appears larger components of low multiple working frequencies.The components of high multiple working frequencies and other frequencies are very small.The lift off speed of foil journal air bearing obtained from these two methods is basically consistent.In terms of load capacity,the eccentricity between the center of rotor and air bearing increases as the load acting on bearing increases.Under the same load,the eccentricity during offloading is larger than that of loading because there is energy loss during offloading due to foil elastic deformation.更多还原