瞬态分析--车轮转动时辐条的弯曲应力。结果不收敛怎么办？

车轮转动时，求轴对车轮中心的向下压力导致辐条的弯曲变形的应力。将车轮外圈作为固定的转动副，车轴端部与车轮中心孔绑定约束， 
时间步：车轮一圈是0.05s 
加载：转速是1200rpm，车轴远端给定一个固定的y方向的力。 

求一圈的瞬时应力。 
结果错误：The solver engine was unable to converge on a solution for the nonlinear problem as constrained. Please see the Troubleshooting section of the Help System for more information.