双同步电机系统轴系柔性有限元建模及扭振特性分析

Analysis of torsional vibration characteristics of shafting of double motor lifting system

针对双同步电机提升系统在实际工况中轴系扭振现象频发问题,对双同步电机系统轴系进行柔性建模和扭振特性分析。首先基于双电机主轴和滚筒的结构,考虑系统的柔性体特征建立柔性有限元模型,并通过有限元分析获取各阶扭振模态,然后施加正弦载荷进行响应分析和扭转角度分析,最后改变柔性参数分析系统轴系扭振特性与柔性的关系。结果表明,有限元柔体建模方案不仅能更精确计算扭振频率,而且更全面地体现系统发生扭振时的动态特性,且与刚性体建模相比,柔性建模系数影响系统轴系低频扭振特性明显。为研究同步电机低频振荡发生的机理提供理论基础。

Aiming at the frequent torsional vibration of shaft system in double-synchronous motor hoisting system under actual working conditions,flexible modeling and torsional vibration characteristics analysis of shaft system of double-synchronous motor system were carried out.Firstly,based on the structure of dual-motor spindle and roller,a flexible finite element model is established considering the characteristics of the flexible body of the system,and the torsional vibration modes of each order are obtained by finite element analysis.Then,sinusoidal load is applied for response analysis and torsional angle analysis.Finally,the relationship between torsional vibration characteristics and flexibility of the system is analyzed by changing flexible parameters.The results show that the model established in this paper can not only reflect the mechanical characteristics of torsional vibration,but also accurately calculate the torsional vibration frequency and reflect the torsional vibration of shafting.Compared with rigid body modeling,the flexible modeling coefficient has obvious influence on the low-frequency torsional vibration characteristics of shafting.It provides a theoretical basis for studying the mechanism of low-frequency oscillation of synchronous motor.