摘要
文章通过振动台试验研究材料性能对缓冲型冲击阻尼器减震性能的影响,从材料层面揭示该类阻尼器的减震机理。试验选取7种缓冲材料,分别用于容器内壁以及颗粒外侧以形成缓冲容器和缓冲颗粒,提出"碰撞硬度"的概念,作为表征影响动量交换的指标。试验结果表明:碰撞硬度小的工况,动量交换较大,阻尼器的减震效果较好;恢复系数和减震效果之间没有明显的规律,原因在于其反映的是动量交换和能量耗散的耦合效应,而这两者存在此消彼涨的负相关关系。在实际工程中,建议使用较硬的颗粒和较软的容器内壁以形成更加高效的缓冲型冲击阻尼器。
In order to systematically explore the damping mechanism of buffered impact dampers,a shaking table test is conducted,in which the material properties are analyzed.Seven buffered materials are chosen in this paper,and experiments on both buffered container and buffered particle are carried out.A new concept"collision hardness"is proposed to represent the critical factor of momentum exchange.Results show that damper with small collision hardness performs better,because it leads to larger momentum exchange.There is no describing rule between the coefficient of restitution and the damping performance,because it reflects the coupled influences of momentum exchange and energy dissipation.There is a negative correlation between these two indexes.In practical engineering,the damper with a hard particle and soft inner wall of the container is recommended.
作者
鲁正
汪晏
杜江
Lu Zheng;Wang Yan;Du Jiang(College of Civil Engineering,Tongji University,Shanghai 200092,China;State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;School of Materials Science and Engineering,Tongji University,Shanghai 200092,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2020年第S02期117-122,共6页
China Civil Engineering Journal
基金
国家自然科学基金(51922080)
上海市优秀学术带头人计划(20XD1423900)
中央高校基本科研业务费专项(11080)
关键词
冲击阻尼器
颗粒阻尼器
材料
振动控制
硬度
恢复系数
impact damper
particle damper
material
vibration control
hardness
coefficient of restitution
