摘要
提出了一种高效的无试重现场动平衡原理与方法,并进行了实验验证及现场应用研究。无试重平衡的基本原理是通过数值模拟的方法,通过在平衡平面上施加虚拟不平衡量,确定转子在轴承处的振动相位相对于平衡平面处的激振力的相位的滞后角。这种滞后可以借助不断完善的转子动力学理论以及有限元数值模拟方法进行确定,其关键是确定轴承的刚度和阻尼系数。滞后角和振动的相位相加便为激振力的相位,将该相位反相可得到配重的相位。配重量由测量得到的振幅和计算得到的振幅之间的比例关系以及虚拟不平衡量的大小确定。实验研究以及现场的平衡实践表明,该方法可以在不加试重的情况下,实现对转子的有效平衡,从而降低机组的现场动平衡的时间和成本。
A field balancing strategy without trail weight as well as its test results and field application was presented here.Essentially,the strategy utilized the method of rotor dynamics to determine the delay angle between the vibration phase at bearings and the exciting force phase on rotor.Modern perfect finite element method(FEM) could be used to solve this problem.The key point of the strategy was to find coefficients of bearing stiffness and damping.Theoretical analysis showed that the phase of trial weight is equal to the summation of vibration phase,delay angle and 1800;the quantity of trial weight can be obtained by the liner scaling between vibration amplitudes of measured and simulated.The test results and field application indicated that this strategy can balance a rotating machinery efficiently,and reduce the balancing time and cost considerably.
出处
《振动与冲击》
EI
CSCD
北大核心
2010年第2期212-215,共4页
Journal of Vibration and Shock
基金
国家自然科学基金项目(50635010)
北京化工大学青年教师基金(QN0717)
关键词
旋转机械
现场动平衡
转子动力学
轴承参数
rotating machinery
field balancing
rotor dynamics
bearing parameter
