一维磁性颗粒链内冲击波传播特性分析

摘要

针对衰减大型建筑结构受地震波冲击作用的动力响应问题，提出了一种基于磁性颗粒链的耗能装置，应用理论分析的方法，建立了其在冲击载荷作用下的动力学方程，依据Maxwell原理，计算了各颗粒间的磁场作用力，采用变步长Runge-Kutta算法，数值求解了颗粒链系统的运动方程，模拟研究了冲击波在一维磁性颗粒链中的传播及衰减特性，结果表明：入射的冲击波在颗粒链内出现了明显的波分散现象，并且随着磁场强度的增加，颗粒链的能量衰减特性提高。%Aiming at attenuating earthquake to the structure,the energy absorber of magnetic granular chain is proposed. By theoretical method, the dynamic equations of the one-dimensional magnetic granular chain are established. The magnetic force of each magnetic particle is calculated by Maxwell theory. The dynamic equations are solved by variable-step Runge-Kutta algorithm. The wave propagation characteristics and the energy decay capacities in magnetic granular chain are investigated. The results show that the incident wave is intermediately transferred into a series of waves in small-amplitude. Additionally,the energy decay capacities of the magnetic granular chain are enhanced with the increasing magnetic field strength.