圆锥腔体非阻塞性颗粒阻尼减振特性研究
非阻塞性颗粒阻尼（non-obstructive particle damper，NOPD）腔体几何形状会显著改变颗粒层间的压力分布特性，从而影响其振动抑制性能。采用离散元数值方法（discrete element method，DEM）分析了圆锥腔体NOPD的动力学特性。首先，构建了NOPD基于离散元的数值模型，并进行了实验测试，结合实验结果验证了模型的可靠性。重点讨论了圆锥腔体NOPD结构参数如颗粒填充比、体积比参数（单个颗粒体积与腔体容积之比）及壁倾角等对其减振性能的影响机制。分析结果表明，圆锥腔体NOPD在0.6的填充比时呈现最佳阻尼效果，且该最优值与壁倾角无关。然后，通过对比分析发现在填充比低于0.6时，圆锥腔体NOPD增加了颗粒间碰撞耗能而表现出优于圆柱形腔体NOPD的减振性能；但当填充比超过0.6时，圆锥结构导致颗粒运动受限反而使其性能下降。参数优化计算显示，锥壁最佳倾斜角度区间为45°~55°，同时确定了最优体积占比参数为0.000 32。
力学工程基础科学
NOPD圆锥腔体离散元法减振性能圆锥腔体壁倾角
张超.圆锥腔体非阻塞性颗粒阻尼减振特性研究[EB/OL].(2025-08-24)[2025-10-27].https://chinaxiv.org/abs/202508.00337.点此复制
The pressure distribution among particle layers of a non-obstructive particle damper (NOPD) will be affected by its cavity shape, and the damping performances of which will be also influenced. On the basis of the discrete element method (DEM), the damping characteristics of the NOPD with a conical cavity are studied. Firstly, the theoretical model of NOPD is established and verified through the comparison with the experimental data. Then, key structural parameters including the filling ratio, volume ratio (individual particle volume to cavity volume) and inclination of the conical cavity wall are studied for their influence on the NOPD's damping characteristics. The analysis reveals 0.6 as the optimum filling ratio of the conical cavity NOPD, and the optimum filling ratio will not be effected by the inclination of the conical cavity wall. Moreover, the damping performance comparison between NOPDs with conical cavity and cylindrical cavity is studied under the same filling ratio. The damping performance of the NOPD with conical cavity is better when the filling ratio is less than 0.6, because the energy dissipation due to particle collisions is more in the NOPD with conical cavity. While its damping effect is worse when the filling ratio is greater than 0.6, the particles are obstructed due to the conical cavity. In addition, the inclination of the conical cavity wall is in the range of 45-55, and volume ratio is 0.000 32.
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