二维振动结构的颗粒阻尼实验

唐伟; 王延荣; 王周成; 巴蒂

二维振动结构的颗粒阻尼实验

北京航空航天大学能源与动力工程学院,北京 100191

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出版历程
- 收稿日期: 2010-01-27
- 修回日期: 2010-06-05
- 刊出日期: 2011-03-28

Experimental study of particle damping for a two-dimensional vibrating structure

School of Jet Propulsion, Beijing University of Aeronautics and Astronautics,Beijing 100191,China

摘要

摘要: 采用非接触式激光测振仪对自由端附有空腔的L型悬臂梁进行了颗粒阻尼减振实验,考查了空腔尺寸对颗粒阻尼的影响规律,得到了二维颗粒阻尼的相关特性.结果表明:①非线性的颗粒阻尼能够显著地抑制结构振动,且阻尼值至少比金属材料阻尼大一个数量级;②二维颗粒阻尼在各个方向上具有相似的阻尼特性,随无量纲加速度的增加,颗粒阻尼先增大后减小,即存在临界无量纲加速度使得颗粒阻尼最大;③随着二维空腔尺寸的增加,颗粒阻尼呈现增加趋势,且阻尼峰值向无量纲加速度增大的方向偏移.该实验研究结果可为二维颗粒阻尼的数值仿真提供可靠依据.
- 颗粒阻尼 /
- 减振 /
- 二维振动 /
- 空腔尺寸 /
- L型梁
Abstract: By use of a non-contact laser vibrometer,experiments were made on an L-shaped beam with a cavity attached to the free end,so as to investigate the damping properties of particle damping for a two-dimensional vibrating structure under different cavity sizes.The experimental results show that: (1)the nonlinear particle damping,which is at least one order of magnitude higher than the intrinsic material damping of metals,can significantly suppress the vibration of structures. (2)The features of two-dimensional particle damping are almost the same in each direction;with the increasing of dimensionless acceleration amplitude,particle damping firstly increases and then decreases,meaning that there is a critical dimensionless acceleration amplitude causing the highest damping. (3)Particle damping as well as the critical dimensionless acceleration amplitude corresponding to the damping peak increases with the cavity sizes.The experimental results could provide a reliable basis for numerical simulation of particle damping in two-dimensions.
- particle damping /
- vibration suppression /
- two-dimensional vibration /

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参考文献(14)

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