A new kind of double degree of freedom (double-DOF) self-tuning vibration absorber has been developed, whose intrinsic frequencies in both vertical translation and horizontal rotation directions can be adjusted to absorb the vibration in the corresponding directions. First of all, the mechanics model of the vibration absorber was established. Its frequency-shift characteristic was analyzed, and the frequency-shift characteristic curves in the two directions were plotted. Then, to study the vibration absorbing effect under the condition of different installation positions and different excitation frequencies, the multi-modal damping system was established. The vibration absorbing effect of the double-DOF absorber was compared with that of the single-DOF absorber under the same input condition. The results show that, the resonant frequencies of the double-DOF vibration absorber can be adjusted in a large frequency band, and its vibration absorbing effect is better when installed on the same side of the excitation than that installed on the other side of the excitation, and is better than that of the single-DOF vibration absorber.%研制一种双自由度自调谐吸振器,可在竖直平动和横向摆动两个方向上调节自身的固有频率,实现两个方向的吸振.首先建立该吸振器的力学模型,对其移频特性进行分析,得到在两个方向上的移频特性曲线.其次建立多模态减振系统,对不同安装位置和不同激励频率条件下吸振器的吸振效果进行仿真研究,并与相同条件下的单自由度吸振器的吸振效果进行比较.结果表明,双自由度吸振器具有较大的移频范围,当安装在激励同侧时更有利于发挥其吸振效果,且其吸振效果优于单自由度吸振器.
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