滚珠丝杠副系统抗共振特性分析

Analysis of the Anti-resonance of Ball Screw System

为了提高高速运动滚珠丝杠副系统的稳定性,避免结构共振,对滚珠丝杠副系统的模态特性进行有限元分析。探讨了螺母位置、支撑方式、工作台及两端支撑轴承对滚珠丝杠副系统模态特性的影响。最后,通过锤击法对滚珠丝杠副系统进行试验模态分析。结果表明:不同的需求场合需选择不同的支撑方式。工作台质量以及轴承的轴向刚度均影响进给系统的轴向变形模态,而轴承的径向刚度主要影响进给系统的弯曲变形模态,且试验结果与计算结果基本一致,本模型能较好地表征系统的动力学特性。

In order to improve the stability of high speed ball screw system, avoiding resonance, modal analysis of the ball screw system is done using the FEA method. Discuss the influence of the positions of the nut, the strut ways, worktable and the supporting bearing on the system mode. Finally, modal testing of the ball screw system is done with hammering method. The result shows that the choice of different strut ways should depend on the needs of occasions. And both the quality of the worktable and the axial stiffness of the support have the main factor that affects the axial deformation mode of the system, and the main factor that affects the flexural deformation mode is the radial stiffness of the support. And the test results are consistent with the calculated results, this model can well characterize the dynamic charac- teristics of the system.