双盘悬臂柔性转子—挤压油膜阻尼器系统的突加不平衡和加速响应特性

SUDDEN UNBALANCE AND ACCELERATING CHARACTERISTICS OF A OVER-HUNG FLEXIBLE ROTOR WITH TWO DISKS SUPPORTED ON CENTRALIZED SQUEEZE FILM DAMPER

建立了双盘悬臂柔性转子—同心型挤压油膜阻尼器 (SFD)系统的运动微分方程 (定常转速和定常加速 )及突加不平衡响应方程 ,分析了系统参数对于突加不平衡响应的影响和加速通过双稳态响应区的突加不平衡及加速响应特性。研究结果表明 :系统参数的变化对突加不平衡响应的变化有较大的影响。对于加速通过双稳态响应区的突加不平衡响应 ,突加不平衡发生在不同的转速比区 ,响应走的路径也不相同 ;不同的盘上发生突加不平衡 ,对于不同临界响应有影响 ;对应两个盘上不同的不平衡量 ,不同阶临界转速处的加速度响应特性不同 ;当悬臂盘距 SFD轴承支承的相对长度较大时 ,系统整体的加速度响应特性较好 ,但突加不平衡后的瞬态振幅也较大。

This paper investigate the sudden unbalance and accelarating process characteristics of a overhung flexible rotor with two disks supported on centralized squeeze film damper. It is found that the system parameters have large influnced the sudden unbalance transient process and transient time when system accelarating through the bistable region.Depending on the starting rotating speed point of sudden unbalance, the response will follow the response route of large solution or small solution. Sudden unbalance on different disk will influnce defferent orders of critical responses.The different unbalance on different disks will influnce the accelarating responses characteristics at different order of criticial rotoring speed. When the lengthen between the overhung disk and the SFD bearing is longer, system will have better accelarating dynamic characteristics.