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Optimal design of inerter-based nonpacked particle damper considering particle rolling

机译：考虑粒子轧制的基于过程的非包装粒子阻尼器的最优设计

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摘要

This paper presents an optimal design method for a nonpacked particle damper (NPPD) based on a simplified mechanical model and corresponding damping mechanism analysis. First, an equivalent inertial single-particle mechanics model (EISM) and the corresponding equivalent principle were proposed to consider the influence of particle rolling on the vibration reduction. The experimental verification of the EISM under seismic ground motion was subsequently carried out. Based on a reasonable verification of the proposed model, an analytical solution of the EISM single-degree-of-freedom structure system for the symmetric two-impacts-per-cycle motion was obtained. The influence analyses of collision distance on the damping effect and the damping mechanism under resonance and nonresonance harmonic excitation were performed. The theoretical calculation formula for the optimal collision distance for energy consumption was obtained based on the damping mechanism analysis. Finally, numerical simulations under harmonic excitation and seismic ground motion were carried out to verify the rationality and generalization of the proposed optimal collision distance. Accordingly, an optimal design method for the NPPD was proposed. Based on the proposed optimization method, the vibration reduction effect of NPPD under far-field records, near-fault pulse-like records, and near-fault nonpulse records are discussed. The analysis results show that the vibration reduction effect of the NPPD is affected by the response frequency of the uncontrolled structure. The proposed optimization method can be used as the basis for the optimization of NPPD under earthquakes.
机译：本文介绍了基于简化机械模型和相应阻尼机构分析的非包装粒子阻尼器（NPPD）的最佳设计方法。首先，提出了一种等同的惯性单粒子力学模型（Eism）和相应的等效原理，以考虑颗粒轧制对振动减少的影响。随后进行了地震地面运动下的Eism的实验验证。基于所提出的模型的合理验证，获得了对对称的对称两循环运动的Eism单级自由度结构系统的分析解决方案。进行了碰撞距离对阻尼效应的影响分析及共振下的阻尼机构和谐振激发。基于阻尼机构分析，获得了能耗的最佳碰撞距离的理论计算公式。最后，进行了谐波激励和地震地面运动下的数值模拟，以验证所提出的最佳碰撞距离的合理性和泛化。因此，提出了一种用于NPPD的最佳设计方法。讨论了基于所提出的优化方法，讨论了远场记录下NPPD的振动减小效应，近故障脉冲状记录和近故障非水记录。分析结果表明，NPPD的减振效果受不受控制结构的响应频率的影响。所提出的优化方法可以用作地震下NPPD优化的基础。

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