基于能量的非堆积型多颗粒阻尼器减振机理分析

为进一步研究非堆积型多颗粒阻尼器(NPPD)减振机理，从能量角度基于等效连体惯容质量模型(DIMEM)对NPPD依次进行物理参数对应减振机理分析及振动控制过程中能量变化规律分析。首先对DIMEM模型进行简介，重点陈述DIMEM模型的建立、DIMEM-单自由度结构运动微分方程及试验验证。在此基础上，定义周期耗能指标及周期动量交换指标，并据此进行物理参数影响机理分析。最后，基于DIMEM模型依次进行自由振动、共振简谐激励及地震作用下减振效果分析，并重点对系统运动过程中能量变化规律及耗能占比进行讨论。结果表明多颗粒阻尼器减振效果变化规律受耗能及动量交换综合影响，单纯依靠耗能机理较难对NPPD减振效果变化规律进行解释。振动控制过程中系统能量主要通过颗粒之间相互作用进行耗散。基于DIMEM模型的NPPD减振机理及减振效果分析对于进一步认识颗粒阻尼器及颗粒阻尼器优化具有重要研究意义。

Damping mechanism analysis of non-packed particle damper based on energy theory

In order to study the damping mechanism of non-packed particle damper (NPPD) in depth, the analysis of energy variation and the damping mechanism of physical parameters are carried out successively based on the proposed double inertia mass equivalent model (DIMEM). Firstly, the DIMEM is described briefly with emphasis on the establishment of DIMEM, the differential equations of motion of DIMEM-SDOF structure and the experimental verification of model. Then, the periodic energy consumption index and the periodic momentum exchange index are defined. The damping mechanisms of different physical parameters are discussed based on the proposed index. Finally, the analyses of damping performance of NPPD under free vibration, resonant harmonic excitation and earthquake are carried out based on the DIMEM. The energy change rule and proportion in vibration control are discussed. The results show that the energy of the system is mainly dissipated by the interaction between particles. The damping performance of NPPD is affected comprehensively by energy consumption and momentum exchange. It is difficult to explain the variation law of damping effect only by analyzing the energy consumption. The vibration reduction effect and mechanism analysis of NPPD based on DIMEM is of great significance for further understanding of particle damper and parameter optimization.