Abstract Dynamic vibration absorbers (DVAs) are practical solutions for vibration absorption. However, it is still a challenge to absorb ultra-low frequency vibration. In this paper, a quasi-zero-stiffness (QZS) DVA is proposed for ultra-low frequency vibration absorption. Firstly, the conceptual design of the QZS DVA is carried out by using a simple oblique-spring model. Then, the dynamic behaviors of a primary system with a QZS DVA under harmonic excitation are obtained by the harmonic balance method (HBM) and verified by numerical analyses. Moreover, the dynamic behaviors under random and impulse are also given numerically. The results show that good performances of ultra-low frequency vibration absorption can be achieved by the QZS DVA under harmonic excitation, and the QZS DVA notably outperforms the linear DVA for mitigating vibration under random and impulse excitations. Finally, experiments on a vibratory system with a QZS DVA are conducted to validate the design concept of QZS DVA for ultra-low frequency vibration absorption

中文翻译：

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一种准零刚度动态吸振器

摘要 动态减振器 (DVA) 是一种实用的减振解决方案。然而，吸收超低频振动仍然是一个挑战。在本文中，提出了一种用于超低频振动吸收的准零刚度 (QZS) DVA。首先，使用简单的斜弹簧模型进行QZS DVA的概念设计。然后，通过谐波平衡法 (HBM) 获得具有 QZS DVA 的一次系统在谐波激励下的动态行为，并通过数值分析进行验证。此外，还给出了随机和脉冲下的动态行为。结果表明，QZS DVA在谐波激励下可以实现良好的超低频吸振性能，在随机和脉冲激励下，QZS DVA 在减轻振动方面明显优于线性 DVA。最后，在带有 QZS DVA 的振动系统上进行了实验，以验证 QZS DVA 用于超低频振动吸收的设计理念