非阻塞性微颗粒阻尼机理的散体元研究

Mechanism of Non Obstructive Particle Damping with Discrete Element Method

基于作者所建立的球状散体元模型，从细观上详细研究了非阻塞性微颗粒阻尼（ＮＯＰＤ） 的机理，为ＮＯＰＤ 的进一步工程应用提供了理论基础．通过对微颗粒组合体与主结构相互耦合运动的计算机仿真，对微颗粒组合体与主结构之间能量传递及其运动过程中的能量损耗的定量计算分析，得到了ＮＯＰＤ 阻尼机理的一般性结论：ＮＯＰＤ 的摩擦耗能与冲击耗能具有相同数量级的阻尼效应，但微颗粒粒径越小，摩擦耗能就越明显大于冲击耗能；ＮＯＰＤ 具有较宽的减振频带．

The discrete element method is applied to study the mechanism of non obstructive particle damping (NOPD) .Sphericalparticle are considered whereby coupled movement between the primary system and particle assemblyisincluded . Quantitative analysis of energy transform is carried on to es timatethe energy dissipated due to particle colliding with the primary system and each other.It is found thatthe energy dissipationin collisionisofthesame order asthatoffriction .NOPDhasa wider vibration reducing frequency band . Generally , dissipation due to friction exceeds that of collision . Such afounding is consistent with the experimentalresults obtained by others.