摘要
声学黑洞(Acoustic Black Holes,ABH)以结构厚度的幂律变化实现弹性波的汇聚,结合阻尼层能较好地抑制结构振动。为进一步实现结构的低频振动控制,将声学黑洞与约束阻尼复合,建立附加约束阻尼的二维声学黑洞薄板模型,采用数值方法计算加速度响应与结构损耗因子,研究二维声学黑洞板附加约束阻尼后的减振特性,并通过二维声学黑洞薄板振动试验开展验证,最后探究约束层材料、厚度及约束阻尼半径对声学黑洞板低频减振性能的影响规律。结果表明:相比于附加自由阻尼,约束阻尼使声学黑洞薄板在第一阶共振峰处的加速度导纳降低12.61 dB;当约束层厚度为截断厚度的2倍左右时,薄板整体可以达到较佳的减振效果。研究可为声学黑洞薄板结构的低频减振应用提供重要参考。
Acoustic black holes(ABH)can realize the convergence of elastic waves by the power-law change of structural thickness,and can better suppress structural vibration using viscoelastic layer.In order to further realize the lowfrequency vibration control of the structure,the acoustic black hole and constraint damping were combined to establish a two-dimensional acoustic black hole thin plate(ABHP)model with passive constrained viscoelastic layer.The acceleration response and structural loss factor model were calculated by numerical method,and the damping characteristics of the ABHP with passive constrained viscoelastic layer were studied and verified by the vibration test of ABHP.Finally,the effects of constraint layer material,thickness and passive constraint viscoelastic layer radius on the low-frequency damping performance of the ABHP were discussed.The results show that compared with the viscoelastic layer,the passive constraint viscoelastic layer can reduce the frequency response of the ABHP at the first resonance peak by 12.61 dB;when the thickness of the constraint layer is about 2 times of the cut-off thickness,the whole thin plate can achieve better vibration reduction effect.This study provides an important reference for the low frequency vibration reduction application of ABHP structures.
作者
魏海婴
温华兵
康钦伟
黄惠文
史自强
吕世金
WEI Haiying;WEN Huabing;KANG Qinwei;HUANG Huiwen;SHI Ziqiang;LYU Shijin(School of Energy and Power,Jiangsu University of Science and Technology,Zhenjiang 212100,Jiangsu,China;China Shipbuilding Group 702-Research Institute,Wuxi 214028,Jiangsu,China)
出处
《噪声与振动控制》
CSCD
北大核心
2023年第2期253-258,291,共7页
Noise and Vibration Control
基金
国防科技重点实验室基金资助项目(6142204190510)。
关键词
声学
声学黑洞
约束阻尼
振动特性
损耗因子
acoustics
acoustic black hole
constraint damping
vibration characteristics
loss factor
