摘要
本文基于分布式吸振器(DVA)概念对低频域段圆柱壳壳体振动控制与壳内声传播抑制方法进行了研究。运用有阻尼式动力吸振器理论,基于COMSOL Multiphysics软件对研究对象进行了有限元建模分析,并根据激励位置给出了一种在圆柱壳内壁不等间距环布动力吸振器的设计方案。结果表明,在所研究的低频段(40 Hz^200 Hz)内,相对于等间距DVA环布方案而言,此方案具有更佳的减振降噪效果,在作用频段内最高达到了26 d B左右的振动抑制与20 d B左右的声衰减。此方案采用的DVA环布方式,可为大型装备壳体的减振降噪设计提供参考。
The approach of vibro-acoustic control of a cylindrical shell in low-frequency stage based on the concept of distributed vibration absorbers（DVA） was studied. Utilizing the theory of dynamic damped absorbers, the finite element model of the cylindrical shell was established and analyzed based on COMSOL Multiphysics software. According to the position of excitation, a design scheme by unequally spliced annular vibration absorbers on the inside wall of the cylindrical shell was given. The result shows that, by comparison with the equally spaced DVA annulus scheme, this design can provide a much better effect of the vibro-acoustic control. The vibration restrain can reach up to 26 d B and the acoustic attenuation can reach up to 20 d B in the studied low-frequency stage. This type of DVA annulus can provide a reference for the vibroacoustic control design of large equipment shells.
作者
谢宇晗
尹剑飞
温激鸿
XIE Yuhan;YIN Jianfei;WEN Jihong(Laboratory of Science and Technology on Integrated Logistics Support, Intelligent Science Faculty, National University of Defence Technology, Changsha 410073, China)
出处
《噪声与振动控制》
CSCD
2018年第A01期264-268,共5页
Noise and Vibration Control
关键词
振动与波
声学
圆柱壳
动力吸振器
有限元分析
vibration and wave
cylindrical shell
dynamic vibration absorber
FEM
