一种旋转机械弯曲转轴平衡配重补偿方法

A compensation weight calculation method for bending shaft balance of a rotating machinery

提出一种旋转机械弯曲转轴的平衡配重补偿方法,从所测转轴弯曲分布曲线中计算得到补偿转轴弯曲影响的配重量,从而降低旋转机械振动。根据转轴弯曲变形的特点,认为轴段截面上弯曲值与角度之间的关系以及弯曲沿轴向的分布可以分别用三角函数和多项式来拟合。为了考虑弯曲截面位置对振动的影响,依据力和力矩平衡方法,把不同轴段上的力分解到两个端面上,在两个端面上保留反对称分量力并将对称分量力修正后移到转轴中部。结合某台135MW汽轮机高压转子弯轴实例进行了分析。

Here,a compensation weight calculation method for bending shaft balance of a rotating machinery was presented.The compensated weight was calculated from a measured rotor bending curve to reduce to rotating machinery's vibration.The deflection of rotor's cross section versus angle and its distribution.along shaft axis were fitted using triangular functions and polynomial functions,respectively.Unbalance forces in each shaft section were divided into its two ends' cross sections using force and moment equilibrium method considering the influence of cross section's location on the vibration of the rotating machinery.The symmetric force components were moved to the shaft center while the a symmetric force components were kept in the two end's cross sections.The method was used to calculate the compensation weight for a 135 MW turbine's high pressure rotor successfully.