自供电MR阻尼器对斜拉索减振的试验研究

发布时间：2018-06-21 11:02

本文选题：斜拉索 + 振动控制　；参考：《振动工程学报》2017年02期

【摘要】：为简化磁流变(MR)阻尼器斜拉索减振系统,同时提高可靠性,基于电磁式振动能量回收技术构建了具有自供电特性的MR阻尼器斜拉索减振系统。其主要由分别安装在拉索较低、较高位置的电流调节式MR阻尼器、旋转式永磁发电机构成,采用链条-链轮机构进行斜拉索面内往复直线运动与电机转子旋转运动的转化,将电机回收的振动能量直接作为MR阻尼器的电源。模型斜拉索减振试验结果表明:相对外供电MR阻尼器最优被动控制,自供电MR阻尼器除斜拉索第1阶模态减振效果基本相当外,自供电MR阻尼器对斜拉索第2~4阶模态减振效果突出,相应的模态阻尼比分别提高了31.8%、37.4%与43.0%;随着斜拉索模态阶次的逐渐增大,自供电MR阻尼器的负刚度控制特性越加凸显,从而显著提高了自供电MR阻尼器对斜拉索高阶模态的减振效果。
[Abstract]:In order to simplify the stay cable damping system of Mr damper and improve the reliability, a Mr damper with self power supply characteristic is constructed based on the electromagnetic vibration energy recovery technology. It is mainly composed of current-regulated Mr dampers installed in lower cables and higher positions, and rotary permanent magnet generators. The chain sprocket mechanism is used to transform the linear reciprocating motion in the cable plane and the rotating motion of the motor rotor. The vibration energy recovered from the motor is directly used as the power source of the Mr damper. The experimental results show that compared with the external power supply Mr damper, the self-powered Mr damper has the same effect except for the first mode of the stay cable. The effect of self-powered Mr dampers on the 2nd and 4th modes of stay cables is outstanding, and the corresponding modal damping ratio increases by 37.8% and 43.0%, respectively. With the gradual increase of mode order of stay cables, the negative stiffness control characteristics of self-powered Mr dampers become more and more prominent. Therefore, the damping effect of self-powered Mr dampers on the high-order modes of stay cables is improved significantly.
【作者单位】：华北水利水电大学土木与交通学院;湖南大学风工程试验研究中心;
【基金】：国家自然科学基金资助项目(51308214) 国家重点基础研究973计划项目(2015CB057702) 河南省高校科技创新团队支持计划(15IRTSTHN028) 河南省教育厅科学技术研究重点项目(13A560711)
【分类号】：U448.27

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