陶瓷球轴承电主轴的模态分析及其振动响应试验

摘要

目的 通过对某异型石材数控加工中心雕铣用陶瓷球轴承电主轴的动态特性的研究,验证电主轴结构设计的合理性.方法 直接在ANSYS中建立陶瓷球轴承-主轴系统三维有限元模型,采用Subspace模态提取法对其进行模态分析,计算主轴前6阶固有频率、振型和临界转速,并利用DZ-2振动测量仪对该主轴进行振动响应试验.结果,无论是ANSYS的模态分析法得出的固有频率还是振动响应试验得出的极限频率,主轴的最高工作转速都低于其一阶临界转速,能有效避开共振区.结论 对比振动响应试验结果与ANSYS仿真结果,该有限元分析模型的建立过程所做的简化处理是正确的,主轴的结构设计也是合理的.%Purpose it analyzes the dynamic characteristic of motorized spindle of ceramic ball bearing used in milling by one irregular shaped stone CNC machining center, which result verifies the rationality of the design structure of the motorized spindle. Solution A 3D FEM system is built directly in ANSYS, which modal is analyzed by adopting Subspace modal extraction,and then the first six sets natural fie quency,vibration mode and critical rotating speed is calculatedln addition the vibration response test for the spindle is carried out by using vibration measuring ins trumentRe suits Both natural frequency resulted from modal analysis method oj ANSYS and limit frequency resulted from vibration test indicates that the designed maxworking speed of this spindle is less than its critical rotating speed, which can avoid the resonance region effectively. Conclusion Comparing the two results of ANSYS simulation and vibration response test,the simplified processing for the establishment of finite element model is proven to be correct and the structure design of the spindle is rational.