摘要
提出了一种结构简单的磁性液体阻尼减振器。根据牛顿第二定律和液体的连续性方程,建立了减振器中磁性液体流动的动力学模型,结合弹性悬臂梁的振动能量,得到减振器施加于悬臂梁后梁对数衰减率的表达式。设计实验验证减振器中不同永磁体半径,外壳与永磁体间的不同间隙以及不同饱和磁化强度的磁性液体对梁振动对数衰减率的影响,表明在所假设的条件下,理论与实验结果的一致性较好。同时还发现,在一定的范围内,磁性液体阻尼减振器的阻尼效果随着永磁体半径的增大而增大;减振器外壳与永磁体间有一最佳间隙,可使得梁振动达到最大的对数衰减率。
A ferrofluid damper with simple structure is proposed.Dynamic model of the flow of the ferrofluid in the damper is built according to Newton’s second law and the continuity equation.Combining this dynamic model with the oscillating energy of a elastic cantilever beam,the expression for logarithmic decay rates of the beam installed with the damper can be obtained,which are also measured experimentally using different dampers composed of magnets with different radius,different gaps between the shells and the magnets or ferrofluid with different saturation magnetization.The experimental results show good agreement with the predictions by the theory.We can also find that the damping effects are enhanced when the radius of the magnets increases and there exists an optimal gap between the shell and the magnet,using which the vibrating beam can attain its maximal logarithmic decay rate.
出处
《振动工程学报》
EI
CSCD
北大核心
2012年第3期253-259,共7页
Journal of Vibration Engineering
基金
国家自然科学基金资助项目(50875017)
