Influence of friction bearings on the frequency response of a variable stiffness mechanism
Influence of friction bearings on the frequency response of a variable stiffness mechanism
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DOI：
10.1016/j.mechmachtheory.2021.104588
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发表时间：
2022
影响因子：
5.2
通讯作者：
A. Lindenmann;E. Heyden;V. Mas;D. Krause;S. Matthiesen
中科院分区：
文献类型：
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作者：
A. Lindenmann;E. Heyden;V. Mas;D. Krause;S. Matthiesen
这一贡献探讨了一个可变刚度的机制，旨在作为振动测试中的边界元素使用。该机构由两个沿中心轴沿着引导的对抗性非线性弹簧组成。轴通过两个轴承轴向引导。本文比较了摩擦和滚动轴承对频率响应的影响。此外，上述机制的动态特性的不同测量技术的比较是重点。利用多正弦，正弦扫描，和脉冲激励信号的实验研究进行。一个非线性的数值模型，以及线性近似，并与测量结果进行比较。结果表明，摩擦轴承对系统的频率响应有很大的影响，特别是在低位移幅值。摩擦接触对不同测量方法的结果的影响。所提出的变刚度机构与滚子轴承配置产生了可预测的振动行为，即使是高机构预紧力。
This contribution examines a variable stiffness mechanism that is intended for the use as a boundary element in vibration tests. The mechanism consists of two antagonistic nonlinear springs guided along the central axis. The axis is axially guided via two bearings. This paper concerns itself with comparing the effects of friction and roller bearings on the frequency response. Further, a comparison of different measurement techniques for the dynamic characterization of the aforementioned mechanism is in focus. An experimental study utilizing a multisine, sine-sweep, and impulse excitation signal is conducted. A nonlinear numerical model as well as a linear approximation are presented and compared with the measurement results. The results indicate that friction bearings have a strong influence on the frequency response of the system, especially at low displacement amplitudes. The influence of the friction contact on the results of different measurement methods is shown. The presented variable stiffness mechanism with the roller bearing configuration yielded in a predictable vibration behavior even for high mechanism pretensions.