Abstract This study proposes a lever-type vibration isolator with eddy current damping (LVI-ECD), which can broaden the isolation band by adjusting the lever ratio and improve the vibration suppression performance with eddy current damping (ECD). The LVI-ECD composes of a lever with a permanent magnet (PM) at the tip of the lever, a load plate, a base plate and springs, etc. The relative motion between the PM and the conductive base and load plates induces ECD, which can be amplified by the lever structure and thus to generate nonlinear damping effect. The theoretical models of the lever-type vibration isolator (LVI) and LVI-ECD are established and the amplitude frequency relationship considering nonlinear damping is deduced. The effects of the lever ratio, tip mass, material property and cross-section of the lever, geometric parameters of the PM and excitation amplitude on the vibration isolation performance of the LVI-ECD are analyzed. The analytical predictions are consistent with the experimental results, which demonstrates that the peak transmissibility and natural frequency decrease with the increase of the lever ratio. ECD can further improve the vibration suppression performance in the resonance region. The transmissibility tends to be flat with the increase of the lever ratio in the isolation region. The vibration isolation performance can be also improved by increasing the tip mass of the lever. The material property and cross-section of the lever have little effect on vibration isolation. This study provides a guideline to design, model and optimize a passive damped lever-type vibration isolator.

中文翻译：

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一种新型的带涡流阻尼的杠杆式隔振器

摘要 本研究提出了一种涡流阻尼杠杆式隔振器(LVI-ECD)，通过调节杠杆比来拓宽隔振频带，提高涡流阻尼(ECD)的隔振性能。LVI-ECD 由杆端带有永磁体 (PM) 的杠杆、负载板、基板和弹簧等组成。 PM 与导电基板和负载板之间的相对运动引起 ECD，可以通过杠杆结构放大，从而产生非线性阻尼效应。建立了杠杆式隔振器（LVI）和LVI-ECD的理论模型，推导了考虑非线性阻尼的幅频关系。杠杆比、尖端质量、材料特性和杠杆横截面的影响，分析了永磁体的几何参数和激励幅度对LVI-ECD隔振性能的影响。分析预测与实验结果一致，表明峰值传输率和固有频率随着杠杆比的增加而降低。ECD 可以进一步提高共振区的振动抑制性​​能。随着隔离区杠杆比的增加，传输率趋于平坦。还可以通过增加杠杆的尖端质量来提高隔振性能。杠杆的材料特性和截面对隔振影响不大。本研究为设计、建模和优化被动阻尼杠杆式隔振器提供了指导。