行星滚柱丝杠副运转过程动态特性分析

以行星滚柱丝杠副为研究对象，建立行星滚柱丝杠副有限元模型。基于显式动力学有限元算法，采用全积分单元进行沙漏控制，通过调整单元密度和采用混合时间积分算法提高计算速度，对行星滚柱丝杠副进行动态特性分析。分析结果表明：随着滚柱转速增大，丝杠相对滚柱的轴向位移、速度大小及波动幅度均变大；不同转速下，螺纹牙上同一接触单元von Mises应力基本一致；同一转速下，丝杠副的4个螺纹牙上的接触单元均存在载荷分布不均现象，且第1个螺纹牙上的von Mises应力波动最大；丝杠侧接触单元von Mises应力大于螺母侧接触单元von Mises应力。

Dynamic Characteristic Analysis of Planetary Roller Screw in Motion Process

By taking a typical planetary roller screw as the research object, a finite element model for dynamic contact of planetary roller screw was established. Based on explicit dynamic finite element method, a dynamic contact analysis of the planetary roller screw was made, a fully integration element algorithm was adopted to control hourglass, the computing speed was improve by adjusting the element density and using mixed time integration algorithm. It was concluded that the axial displacement and speed between screw and roller were raised as increasing in the rotational speed of roller; the dynamic von Mises stress of contact elements on thread teeth were basically the same in different rotational speeds imposed on roller; the phenomenon of loading uneven distribution was presented on whole planetary roller screw thread teeth at the same roller speed, besides, the dynamic von Mises stress fluctuation of the first thread tooth was bigger than others, and the dynamic von Mises stress of contact elements on screw side were bigger than nut side.