粉末颗粒阻尼器阻尼性能的影响因素分析
Influence Factors of Damping Performance in Particle Dampers
鲍泽源 1丁晓红 1李海东 2王谦 1张横1
作者信息
- 1. 上海理工大学 机械工程学院,上海 200093
- 2. 上海机电工程研究所,上海 201109
- 折叠
摘要
增材制造技术制造基于结构拓扑优化方法得到具有复杂构型的轻质高刚结构时,可在制造过程中将未熔融的金属粉末留在结构特定位置的空腔内部,直接生成一种新型的粉末颗粒阻尼器.这种新型阻尼器的阻尼性能与粉末颗粒的相关特性有关,但目前这方面的研究尚不充分.为此采用离散元仿真的手段,研究粉末颗粒的相关特性对粉末颗粒阻尼器阻尼性能和重力、阻尼器空腔体积的影响.制造了一种以钛合金为材料的粉末颗粒阻尼器,以其为基础建立了粉末颗粒阻尼器的离散元模型,进行了在若干不同条件下的数值仿真.研究结果表明:颗粒尺寸、颗粒弹性模量、颗粒泊松比对阻尼器阻尼性能影响有限,而通过增加颗粒密度、降低颗粒摩擦系数、增大阻尼器空腔体积等方式可有效提升粉末颗粒阻尼器阻尼性能.
Abstract
Additive manufacturing technology can fabricate lightweight and high stiffness structures with complex configurations based on the structural topological optimization.A new type of powder particle damper can be generated directly by leaving the unmelted metal powder inside the cavity at a specific location of the structure in the fabrication process.The damping performance of this new type of damper is related to the relevant properties of the powder particles,but research in this area is still insufficient.In this connection,discrete element simulation is used to investigate the influence of the relevant characteristics of the powder particles on the damping performance,gravity of the powder particle damper and the volume of the damper cavity.A powder particle damper made of titanium alloy is fabricated,based on which a discrete element model of the powder particle damper is established,and numerical simulations are carried out under a number of different conditions.The results show that particle size,particle elastic modulus,and particle Poisson's ratio have a limited effect on the damping performance of the damper,while the damping performance of the powder particle damper can be effectively improved by increasing the particle density,decreasing the particle friction coefficient,and increasing the damper cavity volume.
关键词
增材制造/颗粒阻尼器/粉末颗粒特性/离散元/阻尼性能Key words
additive manufacturing/particle dampers/characteristics of powder particles/discrete elements/damping performance引用本文复制引用
出版年
2024
NETL
NSTL
万方数据