A semi-active quasi-zero-stiffness (QZS) dynamic vibration absorber (DVA) (SAQZS DVA) is proposed to broaden the frequency bandwidth for ultra-low frequency vibration absorption. The SAQZS DVA is constructed by embedding an electromagnetic actively regulatory mechanism (ARM) into a QZS DVA to fulfill tuning capability of vibration absorption. The restoring force and stiffness of the SAQZS DVA are investigated theoretically to demonstrate how the ARM performs by tuning the current in the coils. Then, the complicated expression of the restoring force of the SAQZS DVA is fitted by polynomial approximation, and the frequency-amplitude response is obtained analytically. The results show the SAQZS DVA enables vibration absorption at an ultra-low frequency, and the anti-resonance frequency for vibration absorption can be tuned effectively. Furthermore, the prototype of the SAQZS DVA is built, and the verification experiment is carried out. The results indicate that the anti-resonance frequency for vibration absorption can be tuned from 3.86 Hz to 4.67 Hz. Moreover, a remarkable reduction in acceleration amplitude can be observed when the anti-resonance frequency is tuned to match the excitation frequency by adjusting the ARM. Consequently, the SAQZS DVA should be a feasible way for vibration absorption tuning in ultra-low frequency range.

提出了一种半主动准零刚度 (QZS) 动态吸振器 (DVA) (SAQZS DVA)，以拓宽超低频吸振的频率带宽。SAQZS DVA 是通过将电磁主动调节机制 (ARM) 嵌入 QZS DVA 来构建的，以实现振动吸收的调谐能力。理论上研究了 SAQZS DVA 的恢复力和刚度，以通过调节线圈中的电流来演示 ARM 的性能。然后，通过多项式近似拟合SAQZS DVA恢复力的复杂表达式，解析得到频幅响应。结果表明，SAQZS DVA可以实现超低频吸振，并且可以有效调整吸振的反共振频率。此外，搭建了SAQZS DVA样机，并进行了验证实验。结果表明振动吸收的反共振频率可以从 3.86 Hz 调整到 4.67 Hz。此外，当通过调整 ARM 将反谐振频率调整为与激励频率匹配时，可以观察到加速度幅度的显着降低。因此，SAQZS DVA 应该是一种在超低频范围内进行振动吸收调谐的可行方法。当通过调整 ARM 来调整反谐振频率以匹配激励频率时，可以观察到加速度幅度的显着降低。因此，SAQZS DVA 应该是一种在超低频范围内进行振动吸收调谐的可行方法。当通过调整 ARM 来调整反谐振频率以匹配激励频率时，可以观察到加速度幅度的显着降低。因此，SAQZS DVA 应该是一种在超低频范围内进行振动吸收调谐的可行方法。