摘要
磁橡胶约束阻尼处理采用磁化的铁-橡胶混合粉末替代传统的约束阻尼处理中的粘弹性材料,磁橡胶层通过磁力容易吸附在钢制振动体上。振动时,交界面处发生滑移使得部分振动能量转化为热能,达到降低振动的目的。基于周期耗能相等的原理,通过将磁橡胶约束阻尼处理与传统的约束阻尼处理等价,计算磁橡胶约束阻尼处理固支梁的损耗因子η。研究表明,激励力幅值F对η有显著的影响。在滑移出现后,随着F增大,η非线性增加到一个极值后便下降。F增加到一定程度后,磁橡胶约束阻尼处理的阻尼能力反而不如传统的约束阻尼处理。
The modal loss factors η of the clamped-clamped beam with a sheet of magnatic rubber layer damping(MRLD) were calculated based on the derived equation of constrained layer damping treatment(CLD) by equating the dissipation energy due to the relative slip motion and interior loss energy from shear deformation of damping layer to the energy dissipated by CLD in a vibrating cycle. Obtained results illustrate that the damping property of MRLD significantly depends on exterior exciting force F. η increases in proportion to F in the early stage of slip motion and decreases as F continues to rise, resulting in the loss factor of MRLD less than that of CLD.
出处
《振动与冲击》
EI
CSCD
北大核心
2008年第5期5-7,共3页
Journal of Vibration and Shock
基金
国家自然科学基金资助项目(10472035)
关键词
振动
磁橡胶
约束阻尼
摩擦
vibration
magnetic rubber
constrained damping
friction
