关键词: 飞轮, 微振动, 振动分级, 特征参数, 分位数

Abstract:

The broadband micro-vibration associating with the high-speed rotation of the rotor in a flywheel is mainly derived from the centrifugal force and couple generated by the unbalance of the rotor and preload force fluctuation of the bearing assembly. A large structural resonance may be excited by the sources when coupled with the whirling motion or the structural modal of the flywheel. To extract the vibration sources information of a rotor from the micro vibration outputted by the flywheel, the two power coefficients of main orders vibration amplitudes with rotational speed are identified by the robust regression while speeding up. They are used as the characteristic parameters of the flywheel vibration sources. To study the parameters distribution, the quantiles at some given probabilities are calculated based on the results of the Weibull distribution that is used to fit the characteristic parameters of the flywheels at the same order. They show the distributions of the flywheel vibration sources integrally. They can also be used as the classification criteria for vibration sources. This method has been successfully applied to study the characteristic parameters distribution of a 50 Nms flywheel. The results provide the grading criteria for its stabilization screening and the references for the improved design of the super static flywheel.

Key words: Flywheel, Micro vibration, Vibration classification, Characteristic parameters, Quantile