摘要
为研究低频抑振器对流体中板结构的减振降噪性能,建立了考虑流固耦合的水下板结构声振仿真模型。通过对比有限元结果与理论解,验证了所采用的有限元仿真方法的可行性。分析了低频抑振器的材料和结构参数对简支板振动声辐射的影响,结果表明:低频抑振器有较宽的抑振频段,具有抑制结构中弯曲波传播的特性;黏弹性材料对低频抑振器减振降噪性能有重要作用,损耗因子增大对低频抑振器效果有利;增大杨氏模量会使结构在高频的振动和声辐射峰值降低,但并非杨氏模量越大整体效果越优;增加质量和低频抑振器高度有利于改善低频抑振器低频时的性能;改变空腔直径会同时改变低频抑振器的质量、刚度和阻尼,选择空腔直径要综合考虑这些参数变化带来的影响。
In order to study vibration and noise reduction performance of a low-frequency vibration suppressor to an underwater plate structure, an acoustic-vibration simulation model of an underwater plate structure considering fluid-structure interaction was established. By comparing its FE results with the theoretical solution, the feasibility of the FEM was verified. Effects of material and structural parameters of the low-frequency vibration suppressor on vibration and sound radiation of an underwater simply supported plate were analyzed. Results showed that low-frequency vibration suppressor has a wider vibration suppression frequency range and characteristics to suppress bending wave propagation in plate structure;viscoelastic material plays an important role in vibration and noise reduction performance of low-frequency vibration suppressor;increasing loss factor is beneficial to the effect of low-frequency vibration suppressor;increasing material Young’s modulus can reduce peak values of high frequency vibration and sound radiation in plate structure, but it is not true that the larger the Young’s modulus, the better the overall effect;increasing low-frequency vibration suppressor’s mass and height is beneficial to improving its performance within a lower frequency range;changing its cavity diameter can simultaneously change its mass, stiffness and damping, so choosing its cavity diameter should comprehensively consider effects brought by variation of these parameters.
作者
王钰杰
陶猛
符磊
赵雪峰
WANG Yujie;TAO Meng;FU Lei;ZHAO Xuefeng(School of Mechanical Engineering,Guizhou University,Guiyang 550025,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2020年第21期233-240,共8页
Journal of Vibration and Shock
基金
国家自然科学基金(51765008
51365007)
贵州省高层次创新型人才培养项目(黔科合人才[2016]4033)
贵州省科技计划项目(黔科合基础2020-1Z048
黔科合平台人才2017-5781)。
关键词
低频抑振器
水下板结构
流固耦合
减振降噪
low-frequency vibration suppressor
underwater plate structure
fluid-structure interaction
vibration and noise reduction