基于WORKBENCH的多直径刺针振动特性分析

Vibration Characteristic Analysis of Multi-diameter Needle based on WORKBENCH

针对刺针的横向振动域难以捕获及研究模型较少的问题,建立了轴向匀速平动悬臂梁横向振动理论模型。该研究在气动动力源的边缘条件下,结合欧拉-伯努利梁理论和瞬态动力学原理,建立了刺针轴向运动偏微分方程,取瞬时模态函数进行拟合求解,并利用ANSYS-Workbench软件对不同直径参数的刺针进行瞬态动力学仿真,获取刺针的振动域变形偏移量及应力变化特征曲线,对所得振动域范围进行收敛性分析,并对刺针几何参数的选择进行对比分析。通过理论分析与仿真计算得出:刺针的几何直径参数对横向振动特性影响较大;随着几何直径增加,刺针瞬时振动域缩小,振动频率不断增大,超过一定范围,振动域变化不明显;由刺针振动规律得出该针刺机选择刺针的合适尺寸为3.5mm-4mm。

Aiming at the problem that the transverse vibration domain of the needle is difficult to capture and the research model is less,a theoretical model of the transverse vibration of the axial uniform translational cantilever beam is established.In this stud y,under the edge condition of the aerodynamic power source,combined with the Euler-Bernoulli beam theory and the transient dynamics principle,the partial differential equation of the axial motion of the needle is established,the instantaneous modal function is used for fitting and solving.The transient dynamics simulation of the needle with different diameter parameters is carried out by ANSYS-Workbench software,the vibration domain deformation offset and stress variation characteristic curve of the needle are obtained.The c onvergence analysis of the obtained vibration domain range is carried out,and the selection of the geometric parameters of the needle is compared and analyzed.the geometric diameter parameters of the needle have a great influence on the lateral vibration properties;wit h the increase of geometric diameter,the instantaneous vibration domain of the needle decreases,and the vibration frequency increases continuously.Beyond a certain range,the vibration domain does not change significantly.According to the vibration law of the needle,the suitable size of the needle is 3.5-4 mm.