非线性电涡流惯质阻尼器力学性能仿真与试验

Numerical simulation and experimental study on mechanical properties of a nonlinear eddy-current inertial mass damper

摘要:

为提高板式电涡流阻尼器(ECD)的耗能减振效率,融合旋转式电涡流阻尼技术与滚珠丝杠式两节点惯质单元,发展与研制了一种非线性电涡流惯质阻尼器(NEMD).首先阐明了NEMD的整体构造与工作原理,然后综合半理论半仿真分析、三维电磁场有限元仿真分析与样机力学性能测试,获得了NEMD的轴向出力特性,提出了旋转式电涡流阻尼计算分析方法,最后总结建立了NEMD的两阶段设计方法.结果表明:NEMD实现了阻尼器惯性质量与电涡流阻尼的双重增效,显著提升了ECD的耗能减振效率；随着NEMD轴向速度的增加,电涡流阻尼力表现出先上升后下降的非线性特征；综合半理论半仿真与三维电磁场有限元仿真的电涡流阻尼力预测方法可以满足NEMD设计要求.

Abstract:

To improve the energy dissipation efficiency of a planar eddy current damper (ECD), a nonlinear eddy-current inertial mass damper (NEMD) combining the rotary eddy-current damping with two-node inertial mass element based on ball screw mechanism is proposed in this paper. Overall conformations and working principles of the NEMD were well demonstrated. Through semi-theoretical and semi-numerical analysis, three-dimensional finite-element simulation analysis as well as mechanical performance test, axial force characteristics, and calculation method for rotary eddy-current damping of the NEMD were then obtained. A two-stage design method of the NEMD based on the semi-theoretical and semi-numerical analysis and three-dimensional electromagnetic finite-element simulation analysis was established. Results show that the double amplification of the inertial mass and the equivalent eddy-current damping coefficient of the NEMD was realized, which significantly improved the energy dissipation efficiency of the ECD. As the axial velocity of the NEMD increased, corresponding eddy-current damping force increased at the beginning, and then the eddy-current damping force began to decrease nonlinearly when the force reached a maximum. The computational accuracies of the semi-theoretical, semi-numerical analysis, and three-dimensional electromagnetic finite-element simulation analysis on the eddy-current damping could basically meet the design requirements of the NEMD.