惯性效应对电主轴动态性能的影响  

Influence of inertia effects on dynamic behaviors of motorized spindle

作　　者：刘俊峰[1] 廖泉 赖涛[1] 陈小安[2] LIU Junfeng;LIAO Quan;LAI Tao;CHEN Xiaoan(College of Artificial Intelligence,National University of Defense Technology,Changsha 410073,China;The State Key Laboratory of Mechanical Transmission,Chongqing University,Chongqing 410044,China)

机构地区：[1]国防科技大学智能科学学院,湖南长沙410073 [2]重庆大学机械传动国家重点实验室,重庆410044

出　　处：《国防科技大学学报》2018年第4期121-126,共6页Journal of National University of Defense Technology

基　　金：国家自然科学基金资助项目(514005151)

摘　　要：为分析高速电主轴轴承-转子系统的动态特性,利用有限元分析方法和Timoshenko梁理论,建立考虑离心力和陀螺力矩等高速惯性效应和系统阻尼的电主轴转子系统动力学模型;并以120MD60Y6型号高速电主轴为研究对象开展模态试验,获取系统不同工况下的固有频率。研究结果表明:离心力除了造成轴承支承软化外,还会造成转轴软化,且转轴软化是造成主轴系统固有频率下降的主要原因;陀螺力矩会将主轴系统每阶固有频率分为前后两个模态,且前后模态随转速变化的规律不同。仿真结果和试验结果吻合较好,这表明所建模型能够准确预测高速电主轴动态性能。In order to discuss the dynamic behaviors of the bearingrotor system of high-speed motorized spindles,a rotor dynamic model with centrifugal force,gyroscopic couple and system damp was presented by using finite element method and Timoshenko beam theory.An overall model test on a 120MD60Y6-type motorized spindle was carried out to acquire the natural frequencies with different work conditions.The results indicate that centrifugal force will lead to the bearing softening and spindle shaft softening,and the latter is the main reason of the decrease of the natural frequency of the spindle system.Each natural frequency of the spindle system was divided into the forward and backward modes,and the forward and backward modes had different change regularities with speed.The good agreement between the theoretical results and the experimental data shows that the proposed model is capable of accurately predicting the dynamic behaviors of highspeed motorized spindles.

关 键 词：惯性效应 电主轴 动态性能 

分 类 号：TG133.2[一般工业技术—材料科学与工程]