颗粒碰撞阻尼的时效性研究

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振动与冲击 ›› 2013, Vol. 32 ›› Issue (15) : 156-160.

论文

颗粒碰撞阻尼的时效性研究

李海超1，王树林2，杜妍辰3，李生娟2，徐波1，蹇敦亮2,朱钰方2

作者信息 +

Research on the durability of particle impact dampers

LI Hai-chao1 , WANG Shu-lin2 , DU Yan-chen3 , LI Sheng-juan2 , XU Bo1 , Dunliang Jian2, ZHU Yu-fang2

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文章历史 +

摘要

颗粒碰撞阻尼是一种被动式振动控制器，其中颗粒材料在冲击过程中的尺度和形貌变化必然对其减振性能产生重要影响。文中初次探讨了带有中值粒度为35微米的锌颗粒的颗粒碰撞阻尼器在96小时内对正弦激励悬臂梁的阻尼减振的时效性。研究证明，主系统的响应在所考察的时间历程内出现了三次微幅上升，它是锌颗粒材料在冲击作用下结构和能态变化的结果。首先，随着冲击的进程，颗粒的冷焊效应阻碍了冲击器的运动速度，降低了冲击器的动量交换功能。第二，颗粒应变能和层错能的下降降低了系统的不可逆能耗。第三，颗粒的细化使其本身缺陷减少，进一步细化的难度增加，也使得系统内的不可逆能耗不断减小。这是主系统的响应随着振动历程出现了两次阶跃性微幅上升的主要原因。

Abstract

As passive vibration absorber, particle impact damper performance will be influenced by the evolution of particles size and morphology during the impact process. This paper for the first time deals with the durability of the ball impact dampers with Zn particles of median diameter 35m as the damping agent in the container installed on a cantilever subjected to sinusoidal vibration within 96-hour impacting. We show that the response of the primary system is slightly increased three times in the period investigated. It may be ascribed to the change of the morphology and energy state of the Zn particles inside the absorber. With the impacts progressing, particles cold welding may occur which decreases the velocity of the impactor (the ball) and consequently the momentum exchange. On the other hand, the decreased strain energy and dislocation energy of the Zn particles could also reduce the irreversible energy consumption of the system. At the same time, particle size decreasing with working time makes the particles difficult to be further cloven. All these may reduce the irreversible energy consumption. That is why the cantilever response increases step by step with extended step length.

导出引用

李海超;王树林;杜妍辰;李生娟;徐波;蹇敦亮;朱钰方. 颗粒碰撞阻尼的时效性研究[J]. 振动与冲击, 2013, 32(15): 156-160

LI Hai-chao;WANG Shu-lin;DU Yan-chen;LI Sheng-juan;XU Bo;Dunliang Jian;ZHU Yu-fang. Research on the durability of particle impact dampers[J]. Journal of Vibration and Shock, 2013, 32(15): 156-160