转子特性参数的预估和临界响应的预报

建立了转于系统临界转速和阻尼比的估计方法。利用转子升速至80％～90％的临界转速之前的数据就可估计出转子的临界转速和阻尼比,而无须使转子越过临界转速。由此可避免转子过临界时的剧烈振动。本文还给出了转子在临界转速处的不平衡响应的预报方法。实验结果表明,本文建立的方法是有效的。

Estimation of Critical Speed and Damping Ratio of a Rotor and Prediction of the Rotor Response at Critical Speed

This paper presents methods for estimating critical speed and damping ratio of a rotor and predicting the rotor response to imbalance at the critical speed. The estimation and prediction are carried out by means of the vibration values measured during the escalation stage of the rotor speed but below critical speed. In this way the critical speed and damping ratio can be obtained without running the rotor over its critical speeds, therefore a violent and dangerous vibration of the rotor at critical speed can be avoided. Additionally the prediction of the rotor response to imbalance at critical speed can give an assessment of condition of the rotor balance. Experimental results show that the critical speed and damping ratio can satisfactorily be estimated by these methods below 80 percent of the critical speed.