Dynamic stiffness and dynamic damping test bench for foil dynamic-pressure air radial bearing

Abstract

The invention discloses a dynamic stiffness and dynamic damping test bench for a foil dynamic-pressure air radial bearing. According to the test bench, displacement and loads, measured under conditions of different static loads, different exciting forces and different rotational speeds, of a bearing are analyzed to obtain the dynamic stiffness and dynamic damping of the bearing under the corresponding conditions. Therefore, a problem that the existing bearing performance test bench only measure the static stiffness of the bearing on the market is solved; the accuracy of the theoretical designof the rotor dynamics is improved; the overall design difficulty of the foil dynamic-pressure air bearing support is reduced; and the research and development cost and the development cycle are saved.

Description

technical field [0001] The invention relates to the field of testing foil dynamic pressure air bearings, in particular to a dynamic stiffness and dynamic damping test bench for foil dynamic pressure air radial bearings. Background technique [0002] Foil dynamic pressure air bearing is an air self-lubricating bearing, which has been widely used in high power density turbomachinery and high-speed motors; foil dynamic pressure air bearing is still in a stage of technological development and perfection. There is still a large gap between the performance parameters predicted by the theoretical model and the actual parameters. Therefore, the performance parameters of the bearing can only be obtained through experimental measurement; the performance tests of foil dynamic pressure air bearings on the market are basically under static load conditions. Measure its static stiffness, but in actual use, the loads on the bearings are all dynamic loads. Therefore, the rotor dynamics desig...

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Problems solved by technology

[0002] Foil dynamic pressure air bearing is an air self-lubricating bearing, which has been widely used in high power density turbomachinery and high-speed motors; foil dynamic pressure air bearing is still in a stage of technological development and perfection. There is still a large gap between the performance parameters predicted by the theoretical model and the actual parameters. Therefore, the performance parameters of the bearing can only be obtained through experimental measurement; the performance tests of foil dynamic pressure air bearings on the market are basically under static load conditions. Measure its static stiffness, but in actual use, the loads on the bearings are all dynamic loads. Therefore, the rotor dynamics design based on the static stiffness will cause the actual motion state of the rotor to be very different from the theoretical design, which will eventually lead to the failure of the rotor system. fail

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