呼吸性裂纹转子的瞬态振动特性分析
发布时间：2019-01-06 14:50
【摘要】：旋转机械转子轴萌生裂纹后,瞬态加速过程中转涡差角时变使裂纹周期性开合,系统发生不同于稳态情况的振动。基于中性轴法确定裂纹开合,数值计算了呼吸裂纹引起刚度时变的转子过临界转速的瞬态振动,分析裂纹大小、方向角和重力对线性加速转子瞬态振动的影响,以及定功率加速瞬态过程中系统振动响应及稳定性。结果发现,瞬态条件下带呼吸裂纹转子系统亚谐波共振并不明显;裂纹越大,过临界转速时瞬态振幅越大;在临界转速附近裂纹瞬时张开会激起很大的振动;定功率加速过程下,若功率不足以提供转子顺利穿过临界转速,则会出现外界扭矩与瞬态振动的能量耦合,大裂纹还可能造成瞬态振动发展成混沌。
[Abstract]:After the sprouting crack in rotor shaft of rotating machinery, the vortex differential angle changes with time during transient acceleration, which makes the crack open and close periodically, and the vibration of the system is different from that of steady state. Based on the neutral axis method to determine the crack opening and closing, the transient vibration of the rotor with time-varying stiffness caused by the respiratory crack is numerically calculated. The effects of crack size, direction angle and gravity on the transient vibration of the linear accelerating rotor are analyzed. And the system vibration response and stability in the transient process of constant power acceleration. The results show that the subharmonic resonance of the rotor system with respiratory crack is not obvious under the transient condition; the larger the crack, the larger the transient amplitude at the over-critical speed, and the larger the vibration is caused by the instantaneous crack opening near the critical speed. In the process of constant power acceleration, if the power is not enough to provide the rotor passing through the critical speed smoothly, the energy coupling of the external torque and the transient vibration will occur, and the large crack may cause the transient vibration to develop into chaos.
【作者单位】： 北京航空航天大学能源与动力工程学院;
【分类号】：V231.96
[Abstract]:After the sprouting crack in rotor shaft of rotating machinery, the vortex differential angle changes with time during transient acceleration, which makes the crack open and close periodically, and the vibration of the system is different from that of steady state. Based on the neutral axis method to determine the crack opening and closing, the transient vibration of the rotor with time-varying stiffness caused by the respiratory crack is numerically calculated. The effects of crack size, direction angle and gravity on the transient vibration of the linear accelerating rotor are analyzed. And the system vibration response and stability in the transient process of constant power acceleration. The results show that the subharmonic resonance of the rotor system with respiratory crack is not obvious under the transient condition; the larger the crack, the larger the transient amplitude at the over-critical speed, and the larger the vibration is caused by the instantaneous crack opening near the critical speed. In the process of constant power acceleration, if the power is not enough to provide the rotor passing through the critical speed smoothly, the energy coupling of the external torque and the transient vibration will occur, and the large crack may cause the transient vibration to develop into chaos.
【作者单位】： 北京航空航天大学能源与动力工程学院;
【分类号】：V231.96
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