摘要
结合建模与实验,分析了人工心脏泵转子质量不平衡及磁耦合对转子稳定悬浮的影响,依据转子动力学理论推导出了五自由度转子运动方程。由运动方程知,转子前后端的质量耦合可消去,转子同自由度前后端同时控制优于分开控制。运用转子自由振动及陀螺力方程分析了动不平衡对转子偏心的影响,结果表明:建模时增加动不平衡矩阵可有效减小偏心;为减小涡动,转子径向采样周期应与转速相适应,不宜过快。采用有限元方法给出了磁极不同工作方式时的磁力线分布,结果表明同时控制互相垂直方向的磁极有利于减小磁耦合。实验测量了转子在平衡位置的各向位移,并计算出静态时X方向的偏心相对误差为0.28%,Y方向的偏心相对误差为0.42%。
Utilizing model and experiments this research analyzed the effect on artificial heart pump rotor stable suspending from unbalance mass and magnetic coupling. Based on the rotor dynamics theory five degrees of freedom rotor equation was given. The results of the motional equation tenable show rotor front-rear end mass coupling may eliminate. The simultaneous control of rotor front- rear end of the same degree freedom is better than separated adjustment. On the basis of vibration and gyro equation,the dynamic unbalance to the effect of bias was analyzed. The application of dynamic unbalance matrix to establishing model to reduce the bias is an effective method. For reducing whirling the radial sampling period must be suitable to the rotor speed not excessively short. Utilizing the finite element method producing the distribution of magnetic force line at different approaches, then obtaining the mutually perpendicular direction of magnetic pole simultaneously to control,which is advantageous for reduction magnetic coupling. In the experiment the rotor equilibrium displacement was measured and calculated. The relative error of static state X direction bias is 0.28% the Y direction is 0. 42%.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2006年第16期1651-1655,共5页
China Mechanical Engineering
基金
国家自然科学基金资助项目(50175084)
关键词
人工心脏泵
磁悬浮轴承
质量不平衡
磁耦合
artificial heart pump
magnetic suspended bearing
unbalance mass
magnetic coupling
