周期阻尼结构在驾驶室降噪铝钢板隔声特性上的应用

Application of Periodic Damping Structure in Cab Noise Reduction Aluminum Plate Sound Insulation Characteristics

针对驾驶室降噪用大块阻尼铺设的缺陷,提出了二周阻尼铝-钢板敷设方式,通过建立周期阻尼结构振动数学模型,仿真计算研究了周期阻尼结构模态分析,并分析了铝-钢板密度、阻尼块密度和形状三个主要参数对隔声量的影响,最后对比周期阻尼和大块阻尼隔声效果。结果表明:模态振幅减小的变化趋势随着频率的增大越来越明显,说明具有周期阻尼的更有利于降低铝-钢板结构的振动;隔声效果随着铝-钢板密度和阻尼块密度的增加而增大,在250~1000 Hz的中高频段,隔声量增加得更为明显。

In view of the building large damping laid defects,puts forward two weeks damping aluminum-rubber plate installation,by establishing the mathematical model of two-dimensional periodic vibration damping structure simulation to study the two-dimensional periodic damping structure modal analysis,and analyzes the aluminum-rubber sheet density,density and shape three main parameters of damping block affects the quantity of sound insulation,the contrast of two-dimensional periodic damping and large damping sound insulation effect.Results show that the change of the modal amplitude decrease trend is more and more obvious with the increase of frequency,this suggests that the laying of two-dimensional periodic damping is more advantageous to reduce vibration of the aluminum and rubber structure.Sound insulation effect with aluminum and rubber block density increases with increasing of density and damping,in 250 hz-1000 hz,the high frequency noise increase is more obvious.Circular cycle aluminum and rubber band gap width is large,the structure forming of sound insulation effect is good.