电涡流单摆式TMD阻尼特性的有限元分析

Finite Element Simulation of Damping Characteristics of Eddy Current Pendulum TMD

在高层及超高层建筑的抗风和抗震中,单摆式调谐质量阻尼器(PTMD)有着较为广泛的应用。传统的PTMD采用油阻尼器作为阻尼装置。然而,油阻尼器具有施工不便、耐久性差、阻尼难以调节等缺点,而且这还会给PTMD带来附加刚度,不利于PTMD的频率设计。在前人的研究成果基础上,利用电涡流阻尼代替油阻尼器,提出一种新型的电涡流单摆式TMD(EC-PTMD),并利用大型电磁场有限元分析软件Opera3D对其进行建模分析。对导体板厚度、导磁钢板厚度及其磁导间距进行了参数分析,结果表明:电涡流阻尼的大小随着导体板、导磁钢板厚度的增加基本呈非线性增长;随着磁导间距的增大,电涡流阻尼呈非线性减小。在用二次函数拟合磁导间距与有效电涡流阻尼系数间关系的基础上,提出一种有较强适用性的EC-PTMD的设计方法。

The pendulum tuned mass dampers（PTMD） have a wide application in the wind and earthquake resistance of high and super high rise buildings. Traditional PTMD adopts oil dampers as the damping devices. However, the oil dampers have disadvantages such as inconvenience, poor durability and hard damping, and adding additional stiffness to the PTMD, which is detrimental to the frequency design. In this paper, based on the research achievements of predecessors, a new kind of eddy current pendulum TMDs（EC-PTMD） was proposed using the eddy current dampers instead of the oil dampers. The large electromagnetic field finite element analysis software Opera3 D is used for modeling analysis. Influences of thickness of conductor plates, thickness of magnet-conductor steel plates, the spacing of the steel plates and the permeability parameters on the eddy current damper performance were analyzed. The results show that the damping of the eddy current damper increases nonlinearly as the thickness of the conductor plate or magnet-conductor steel plate increases;while it decreases nonlinearly as the permeability layer thickness increases. Based on the curve＇s fitting between the air gap and the effective eddy current damping coefficient using a quadratic function, a new applicable design method of EC-PTMD was proposed.