考虑负载变化的机床传动系统时变动特性研究

张会杰;刘海涛;张俊;赵万华

振动与冲击 ›› 2014, Vol. 33 ›› Issue (9) : 173-178.

PDF(1385 KB)
PDF(1385 KB)
振动与冲击 ›› 2014, Vol. 33 ›› Issue (9) : 173-178.
论文

考虑负载变化的机床传动系统时变动特性研究

  • 张会杰,刘海涛,张俊,赵万华
作者信息 +

Time-varying dynamics characteristics of the transmission system of machine toolbased on load variation

  • ZHANG Hui-jie LIU Hai-tao ZHANG Jun ZHAO Wan-hua
Author information +
文章历史 +

摘要

在航空薄壁件的加工过程中,由于材料去除率大会导致工件质量变化剧烈(简称“负载变化”),使得丝杠传动系统的驱动负载变化较大,进而影响传动系统的动态性能。为获得机床传动系统的时变特性,首先对考虑负载变化和导轨滑块副摩擦特性的传动系统进行动力学物理模型等效,并采用集中参数法建立动力学模型。理论分析了传动方向等效阻尼系数随负载变化的变化规律和不同负载下传动系统的固有频率和加速度振动响应的变化规律。理论分析结果表明,机床传动系统的动态性能在工件材料大切除率加工过程中存在着时变特性。传动系统的等效阻尼系数随着负载的减小而减小,固有频率和加速度振动响应幅值则随负载的减小而增加,并且都具有很强的非线性行为。最后通过模态测试实验验证了理论分析的正确性。

Abstract

The workpiece mass varies greatly due to large material removal rate when machining aeronautical thin-walled structure. The driving force of transmission system also changes greatly, which can affect the transmission system dynamics. In order to obtain the time-varying dynamics of machine tool transmission system, a dynamics 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 frequency and vibration response of transmission system is studied as well under different loads. The results show that a time-varying dynamics of transmission system is found when machining large material removal rate. The equivalent damping coefficient decreases as the load decreases, while the natural frequency and vibration amplitude increase as the load decreases. Finally, modal testing is performed to validate the theoretical analysis.


关键词

传动系统 / 动力学模型 / 负载变化 / 时变动特性

Key words

Transmission system / Dynamics model / Load Variation / Time-varying dynamic characteristics

引用本文

导出引用
张会杰;刘海涛;张俊;赵万华. 考虑负载变化的机床传动系统时变动特性研究[J]. 振动与冲击, 2014, 33(9): 173-178
ZHANG Hui-jie LIU Hai-tao ZHANG Jun ZHAO Wan-hua. Time-varying dynamics characteristics of the transmission system of machine toolbased on load variation[J]. Journal of Vibration and Shock, 2014, 33(9): 173-178

PDF(1385 KB)

Accesses

Citation

Detail

段落导航
相关文章

/