磁约束阻尼处理悬臂壳的振动分析  

VIBRATION ANALYSIS OF CANTILEVER CYLINDRICAL SHELL WITH MAGNETIC CONSTRAINED LAYER DAMPING TREATMENT

作　　者：吉德三[1] 吴忠良[2] 李明[1] 

机构地区：[1]武汉科技大学理学院,武汉430065 [2]武钢热轧带钢厂,武汉430080

出　　处：《固体力学学报》2008年第S1期149-154,共6页Chinese Journal of Solid Mechanics

基　　金：国家自然科学基金资助项目(10472035)

摘　　要：在柔性结构的减振处理中,传统被动约束阻尼处理(PCLD)方法已被广泛采用,但是由于阻尼材料特性受温度和频率的影响,其减振效果受到限制。采用在约束层上设置永磁体的方法(MCLD)可使阻尼层达到比传统约束阻尼处理更高的剪应变,从而增强粘弹层的阻尼耗能,提高减振效果。本文针对悬臂壳的第一阶扭转模态(1,1),从悬臂壳的自由端,在悬臂壳圆周方向上θ=0及θ=π处,沿x方向对称地设置两条永磁体,在永磁体两侧设置磁约束阻尼层,分析了在阻尼层不同铺设长度和铺设宽度下,磁约束处理方法的减振效果。研究表明,在悬臂壳的自由端铺设磁约束阻尼层时,能有效地提高阻尼减振效果;减振效果的提高程度与阻尼层的长度和宽度有关。Conventional passive constrained layer damping (PCLD) treatments are used extensively to damp out the vibration of flexible structures. However, the damping effectiveness has been limited because the damping material property changes with temperature and frequency. Using magnetic constrained layer damping (MCLD) treatment can enlarge the shear strain of viscoelastic damping layer resulting from the attraction arrangement magnets on the constraining layers root and significant improvement of damping property can be obtained. In this study, emphasis is placed on vibration property of a cantilever shell with MCLD treatment for the first torsional mode (1, 1). Two permanent magnets are placed on the free-end of the shell and along the line θ=0 and θ=π respectively, and MCLD patches are located at each side of permanent magnet. The effects of patch length and width were discussed. The obtained results indicated that the MCLD patches at the free-end can significantly enhance system damping capacity. And the improvement effect of damping property of MCLD vs. PCLD is influenced by patch length and width.

关 键 词：永磁体 夹心悬臂壳 约束阻尼层 损耗因子 

分 类 号：O328[理学—一般力学与力学基础]