轴系对中偏差对单支撑轴系振动的影响

Influence of Shaft Alignment Deviation on Vibration of Single-support Shafting

建立了单支撑轴系动力特性分析有限元模型,研究轴系对中偏差对单支撑轴系振动的影响。结果表明:轴系对中偏差会改变中间轴承载荷和油膜刚性,对振动传递特性产生影响;单支撑轴系出现的振动不完全表现在不平衡转子所在跨内;在轴系对中偏差情况下,低压转子不平衡量会在相邻高中压转子上激发起较大振动。

The finite element model of single-support shafting was established to study the influence of shaft alignment deviation on the vibration of single-support shafting. Results show that the shaft alignment deviation would change the load of intermediate bearing and the rigidity of oil film, and then affect the vibration transmission characteristics. The vibration of single-support shafting is not completely reflected in the span of the unbalanced rotor. In the case of shafting alignment deviation, unbalance of the low-pressure rotor would stimulate large vibration on the adjacent high-pressure rotor.