Abstract A non-packed particle damper (NPPD) is an advantageous passive damping device with a wide frequency band and good robustness. However, its damping mechanism remains unclear, and its application for controlling vibrations in civil engineering structures is being explored. By analysing the particle motion state, this paper proposes a double inertia mass equivalent model (DIMEM) to reflect the interaction between particles. The effect of inertia was introduced in the DIMEM to consider the rolling effect of particles on the damping performance of the NPPD. An electromagnetic vibration table test of a single-storey frame structure with an NPPD was designed and performed. The parameter determination method and applicability of the DIMEM were also evaluated based on experimental and theoretical analyses. Furthermore, the effects of the parameters on the damping performance of the NPPD were systematically analysed. The results confirm that the equivalent model can reflect the damping performance and mechanism of the NPPD. The particle group inertia is an inherent property of the NPPD. With an increase in the ratio of inertance to particle mass, the optimal vibration damping performance deteriorates under harmonic excitation, and the corresponding equivalent connection stiffness gradually increases. The equivalent connection stiffness, additional mass ratio, recovery coefficient, and acceleration normalised collision distance significantly affect the damping performance and mechanism. However, the effects of the equivalent connection damping coefficient and rolling friction coefficient are negligible. The proposed DIMEM and the corresponding parameter analysis can provide an important reference for the application of NPPDs in civil engineering.

中文翻译：

---

非填充颗粒阻尼器等效模型及参数分析

摘要 非填充粒子阻尼器（NPPD）是一种具有宽频带和良好鲁棒性的优势被动阻尼装置。然而，其阻尼机制尚不清楚，正在探索其在土木工程结构中控制振动的应用。本文通过对粒子运动状态的分析，提出了双惯性质量等效模型（DIMEM）来反映粒子之间的相互作用。在 DIMEM 中引入了惯性效应，以考虑粒子对 NPPD 阻尼性能的滚动效应。设计并执行了具有 NPPD 的单层框架结构的电磁振动台试验。DIMEM 的参数确定方法和适用性也基于实验和理论分析进行了评估。此外，系统地分析了参数对NPPD阻尼性能的影响。结果证实等效模型能够反映NPPD的阻尼性能和机理。粒子群惯性是 NPPD 的固有属性。随着惯性与粒子质量比的增加，谐波激励下的最优减振性能恶化，相应的等效连接刚度逐渐增加。等效连接刚度、附加质量比、恢复系数和加速度归一化碰撞距离显着影响阻尼性能和机构。然而，等效连接阻尼系数和滚动摩擦系数的影响可以忽略不计。