Time-varying dynamic characteristics of transmission system of a machine tool considering load variation

被引：0

作者：

Zhang, Hui-Jie ^{[1
]}

Liu, Hai-Tao ^{[1
]}

Zhang, Jun ^{[1
]}

Zhao, Wan-Hua ^{[1
]}

机构：

[1] State Key Laboratory for Manufacturing Systems Engineering, Xi'an jiaotong University

来源：

Zhendong yu Chongji/Journal of Vibration and Shock | 2014年 / 33卷 / 09期

关键词：

Dynamic model; Load variation; Time-varying dynamic characteristics; Transmission system;

D O I：

10.13465/j.cnki.jvs.2014.09.032

中图分类号：

学科分类号：

摘要：

The workpiece mass varies greatly due to large material removal rate when machining aeronautical thin-walled members. The driving force of screw transmission system of a machine tool also changes greatly, this load variation can affect the transmission system dynamic charateristics. In order to obtain the time-varying dynamic behavior of the machine tool transmission system, a dynamic model of the transmission system was established using the lumped parameter method considering load variation and friction characteristics of the slide block. The equivalent damping coefficient in feed direction was theoretically analyzed with the load variation. And the evolution of natural frequencies and vibration responses of the transmission system was studied under different loads. The results showed that the time-varying dynamic characteristics of the transmission system of the machine tool exist during machining with a large material removal rate; the equivalent damping coefficient decreases with decrease in the load, but the natural frequencies and acceleration vibration amplitude increase with decrease in the load, these variations are strongly non-linear. Finally, modal tests were performed to validate the correctness of the theoretical analysis.

引用

页码：173 / 178

页数：5

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