超高加速度宏微运动平台连接臂的疲劳寿命分析研究

Analysis and Research on Fatigue Life of Connecting Arm of Ultra-high Acceleration Macro and Micro Motion Platform

宏微运动平台连接臂是宏微运动平台的关键部件,其工作寿命影响着宏微运动平台的使用时间与定位精度。联合SolidWorks、ANSYS Workbench和nCode DesignLife对连接臂进行有限元仿真。通过SolidWorks建立连接臂的三维模型,导入到ANSYS Workbench中进行静力分析、模态分析和瞬态动力学分析,获得危险点的位置、固有频率、振型、应力和变形随时间变化曲线以及疲劳载荷谱数据。将瞬态动力学分析结果和载荷谱数据导入到nCode DesignLife中进行疲劳评估,得到连接臂疲劳寿命和疲劳损伤结果云图。结果表明:连接臂危险点主要分布在连接臂右端的脖颈处;在工作中,宏微运动平台连接臂不会与音圈电机发生共振现象;连接臂危险点处的最低寿命为1.047×10^(14)次。

The connecting arm of the macro and micro motion platform is a key component of the macro and micro motion platform,and its working life affects the use time and positioning accuracy of the macro and micro motion platform.SolidWorks,ANSYS Workbench and nCode DesignLife was used to perform finite element simulation on the connecting arm.A 3D model of the connecting arm was built by using SolidWorks,and then it was imported into ANSYS Workbench for static analysis,modal analysis and transient dynamic analysis to obtaine the position,natural frequency,mode shape,stress and deformation curve with time and fatigue load spectrum data of the dangerous point.The transient kinetic analysis results and the load spectrum data were imported into the nCode DesignLife for fatigue assessment,and the fatigue life and fatigue damage result cloud diagram of the connecting arm were obtained.The results show that the danger point of the connecting arm is mainly distributed at the neck of the connecting arm right end;while the macro and micro motion platform connecting arm does not resonate with the sound ring motor;the minimum life at the danger point of the connecting arm is 1.047×10^(14)times.