【摘要】 对嵌入弹簧式气体箔片轴承(NSFBs)的动态特性进行实验研究.首先,设计搭建了NSFBs动态特性测试平台,分别对NSFBs进行转子静止和旋转(24.00 kr/min)状态下的冲击实验,从冲击实验结果中识别出轴承的动态刚度和等效黏性阻尼系数,并研究了轴承动态系数随弹簧个数的变化规律.在测试过程中,为保证冲击载荷下不同弹簧数实验轴承的名义间隙相同,将轴承组装后进行静态推拉实验以测量实验轴承的名义间隙,然后根据测试的实际轴承间隙计算敲击实验中转子的直径.实验结果表明:无论转子旋转还是静止,轴承的直接刚度系数、等效黏性阻尼系数和损耗因子都随着弹簧数量的增加而增加,并且,转子旋转状态下的直接刚度和等效黏性阻尼系数小于转子静止状态下的结果.更多还原

【Abstract】 This paper presented an experimental investigation on the dynamic characteristic of nested compres-sion spring gas foil bearings(NSFBs). A test rig was built to test the dynamic characteristic of the NSFB. Impact load tests with stationary rotor and rotating rotor(24.00 kr/min)were conducted,respectively. The dynamic stiffness and equivalent viscous damping coefficients of the studied bearing were extracted from the results of impact load tests.Bearings with different spring numbers were tested and their dynamic coefficient were compared. Static load tests were conducted to measure the real clearance of the test bearings after assembling. And then the diameter of the rotor in the impact load tests was calculated based on the tested real bearing clearance to confirm that the nominal clearance for the test bearings with different spring numbers are the same under the impact loads. For both the tests with stationary rotor and rotating rotor,the direct stiffness coefficients,direct equivalent viscous coefficients,and loss factor increasd as the spring number increased. However,the direct stiffness and equivalent viscous coefficients for the test with rotating rotor were smaller than the results of the test with stationary rotor.更多还原