摘要
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。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。
By taking a typical planetary roller screw as a study object, a finite element model for dynamic contact of the planetary roller screw was established. Based on the 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 improved by adjusting the element density and using a mixed time integration algorithm. It was concluded that the axial displacement and speed between the screw and the roller raise with increase in the rotational speed of the roller; the dynamic yon Mises stresses of the contact elements on the thread teeth are basically the same at different rotational speeds of the roller; the phenomenon of loading uneven distribution exists on the whole planetary roller screw thread teeth at the same roller rotating speed ; besides, the dynamic yon Mises stress fluctuation of the first thread tooth is bigger than others, and the dynamic yon Mises stresses of the contact elements on the screw side are bigger than those on the nut side.
出处
《振动与冲击》
EI
CSCD
北大核心
2013年第3期167-171,187,共6页
Journal of Vibration and Shock
基金
国家自然科学基金(50975232,51275423)
关键词
行星滚柱丝杠
螺纹传动
动态特性
显式动力学
planetary roller screw
thread driving
dynamic characteristic
explicit dynamics
