摘要
为研究1 000 MW级核电站离心式上充泵转子轴系扭振特性,应用Pro/E和ICEM软件对水体部件进行三维造型和网格划分,借助现代CAE技术,并采用有限元分析软件Ansys对上充泵转子轴系的扭转振动特性进行数值计算,通过扭振分析得到转子轴系在不同转速下的扭转振幅.结果表明:采用三支撑转子轴系的结构稳定性相比于两端支撑的转子轴系各阶固有频率都有明显提高,这有助于减小上充泵运行时的振动和噪声;在4 900 r/min的转速下转子轴系发生了较为明显的一阶扭转共振,引起共振的主要原因是电动机驱动力矩的6次谐波分量频率和转子轴系的一阶扭振固有频率的整数倍接近;上充泵设计运行转速为4 500 r/min,转速与转子轴系各阶临界转速值相差较大,其转子轴系的扭转振幅较小,不会发生扭转共振,表明所设计的转子轴系结构是合理的.
The torsional vibration characteristics of the rotor of a centrifugal charging pump for 1 000 MW nuclear power plants were calculated by means of Ansys;and the vibration amplitude under diffe-rent rotational speeds were obtained.The computational geometry model was built by using Pro/E and its mesh was generated in ICEM.The results showed that the stability of the rotor with three supports is better than the rotor with two supports since all the natural frequencies of the former are significantly higher compared with the latter,suggesting the former will help reduce vibration and noise issued from the pump in operation.When the pump is running at the 4 900 r/min rotational speed,a first order torsional resonance takes place quite clearly because the sixth harmonic frequency of the motor driving torque is around an integer multiple of the first order torsional vibration natural frequency of the rotor.The design operating speed of the charging pump is 4 500 r/min;since it is less than every order critical speed of the rotor,a torsional resonance cannot occur.This indicates that the structure design of the rotor shaft is reasonable.
出处
《排灌机械工程学报》
EI
北大核心
2013年第5期394-400,共7页
Journal of Drainage and Irrigation Machinery Engineering
基金
"十二五"国家科技支撑计划项目(2011BAF14B04)
江苏省自然科学基金资助项目(BK2011504)
江苏省科技支撑计划项目(BE2010156)
关键词
核电站
离心式上充泵
转子
轴系
扭振
nuclear power plant
centrifugal charging pump
rotor
shaft
torsional vibration
