Vibration analysis of a coupled feed system with nonlinear kinematic joints
Vibration analysis of a coupled feed system with nonlinear kinematic joints
复制标题
具有非线性运动关节的耦合进给系统的振动分析
DOI：
10.1016/j.mechmachtheory.2019.01.014
复制
发表时间：
2019
影响因子：
5.2
通讯作者：
Zhang Yimin
中科院分区：
文献类型：
--
作者：
Wang Wei;Zhou Yanxun;Wang Hao;Li Changyou;Zhang Yimin
本研究建立一个多自由度模型，以探讨具有非线性运动副之进给系统之振动特性。直线导轨、滚珠丝杠和滚珠轴承是连接和支撑进给系统的主要运动副。考虑滚珠的接触特性，接触力是多自由度系统位移的分段光滑函数。在建模方面，根据实验进给系统确定了几何参数和材料参数，并通过动态实验对模型进行了验证。推导了系统的运动方程，分析了力激励和螺母位置对振动系统振幅和稳定状态的影响。随着丝杠螺母位置的变化，位移和变形幅值在共振频率附近存在跳跃现象。耦合振动强烈地导致了硬化和软化型非线性、超谐共振、跳跃现象和混沌运动。多自由度模型的应用可以为抑制振动和提高加工精度提供信息。(C)2019爱思唯尔有限公司版权所有。
In this study, a multi-degree-of-freedom model is developed to investigate the vibration characteristics of a feed system with nonlinear kinematic joints. Linear guide, ball screw, and ball bearing are the main kinematic joints that connect and support the worktable of a feed system. Considering the contact behaviors of rolling balls, contact force is a piece-wise smooth function of displacements of the multi-degree-of-freedom system. In terms of modeling, geometry and material parameters are determined according to the experimental feed system and the model is verified by a dynamic experiment. The motion equations of the system are derived to evaluate the effects of force excitation and screw-nut position on the vibration amplitude and stable state of the vibratory system. With the variation of screw-nut position, there exist jumping phenomena for displacement and deformation amplitude near the resonance frequency region. The hardening and softening type nonlinearity, super harmonic resonance, jumping phenomenon and chaotic motion are strongly attributed to the coupling vibrations. The application of the multi-degree-of-freedom model can supply information to suppress vibration and improve processing precision. (C) 2019 Elsevier Ltd. All rights reserved.