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宽度方向附加局部磁约束阻尼条的夹心板的振动特性
引用本文:李明,郑慧明,杨洪武,何锃.宽度方向附加局部磁约束阻尼条的夹心板的振动特性[J].噪声与振动控制,2007,27(6):6-9,16.
作者姓名:李明  郑慧明  杨洪武  何锃
作者单位:华中科技大学力学系 武汉430074
摘    要:在柔性结构的减振处理中,传统被动无磁约束减振(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。而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方法更高的剪应变,从而增强粘弹层的阻尼耗能,提高低阶模态的减振效果。针对悬臂板的(m=1,n=1)、(m=2,n=1)的两阶扭转模态,在这两阶的方向上的节线y=B/2处设置永磁体,节线两侧设置磁约束阻尼层,研究MCLD的阻尼改进效果及规律。研究表明,在悬臂板的自由端铺设磁阻尼层时,能有效地提高阻尼减振效果;另外,对不同阻尼层的宽度,MCLD仍具有提高阻尼的能力。

关 键 词:振动与波  永磁体  夹层板  约束阻尼  剪应变  损耗因子
文章编号:1006-1355(2007)06-0006-04
收稿时间:2007-01-15
修稿时间:2007-03-03

Vibration Analysis of a Sandwich Plate with Magnetic Constrained Damping Strips along Width Direction
LI Ming,ZHENG Hui-ming,YANG Hong-wu,HE Zeng.Vibration Analysis of a Sandwich Plate with Magnetic Constrained Damping Strips along Width Direction[J].Noise and Vibration Control,2007,27(6):6-9,16.
Authors:LI Ming  ZHENG Hui-ming  YANG Hong-wu  HE Zeng
Abstract:Traditional passive constrained layer damping (PCLD) treatments are used extensively to reduce the vibration of flexible structures.However,the effectiveness of these treatments has been limited because of the variation of the damping material properties with temperature and frequency.Therefore, the concept of the magnetic constrained layer damping (MCLD) is introduced in controlling plate vibra- tion.In this study,emphasizing the first (1,1) torsional mode and the second (2,1) torsional mode of cantilever plate,the structure under investigation consists of a cantilever plate with one permanent magnet placed on the nodal line y=B/2 of the two torsional mode and two MCLD which are symmetrical along the line y=B/2.The effects of the location of the patches and of the treatment width are then discussed. The results indicated that the MCLD at the free-end can enhance significantly the loss factors whereas the MCLD at the fixed-end can induce little improvement of damping characteristics.Moreover,the MCLD can also improve damping property with different treatment width.
Keywords:vibration and wave  permanent  sandwich plate  constrained damping  shear strain  loss factor
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