Absorption Performance of an Anechoic Layer with a Steel Plate Backing at Oblique Incidence
Absorption Performance of an Anechoic Layer with a Steel Plate Backing at Oblique Incidence
复制标题
钢板背衬消声层斜入射吸声性能
DOI：
10.1007/s40857-018-0142-y
复制
发表时间：
2018-08
期刊：
影响因子：
--
通讯作者：
王斌
中科院分区：
文献类型：
--
作者：
周富霖;范军;王斌
对斜入射下钢板背吸声涂层的吸声特性进行了理论和数值研究。利用弹性理论推导了吸声系数的解析表达式。采用有限元方法，建立了适用于斜入射下非均匀涂层的二维周期数值模型。为了解释吸收机理，用谱方法计算了导波在均匀涂层和钢板中的频散曲线。利用弹性板谐振理论分析了吸声系数与入射角和频率的关系。研究了钢板衬底和涂层衰减的影响。对钢板衬底Alberich消声涂层的吸声系数进行了数值计算，并从结构位移矢量和变形两个方面探讨了吸声机理。可以发现以下吸收特性。在吸收系数的频率-角谱中，涂层中低阶Lamb波产生的亮区在低频下是可识别的。在大入射角和低频下，出现一个宽广、强烈的消声区，在这种情况下，钢板和二维空腔的位移是结构振动的主要成分。随着钢板厚度的增加和空腔高度的增加，共振向低频方向移动。在相对较高的频率下，一些新的吸收区域是由于周期性空穴的共振而产生的，并且覆盖了涂层中的高阶兰姆波对衰减的贡献。相应的吸收系数随入射角的增大而减小。
The sound absorption of steel-plate-backed anechoic coatings at oblique incidence is investigated theoretically and numerically. An analytical expression for the absorption coefficient is derived using elasticity theory. A 2D numerical periodic model suitable for inhomogeneous coatings under oblique incidence is built using the finite-element method. To interpret the absorption mechanism, the dispersion curves for guided elastic waves in a uniform coating and a steel plate are calculated using the spectral method. The absorption coefficients are analyzed with respect to the incident angle and frequency using elastic plate resonance theory. The effects of the steel plate backing and the attenuation of the coating are investigated. For the Alberich anechoic coating with a steel plate backing, the absorption coefficients are calculated numerically, and the absorption mechanism is investigated by structural displacement vectors and deformations. The following absorption characteristics can be found. In the frequency-angle spectra for absorption coefficients, the bright areas resulting from low-order Lamb waves in the coating are recognizable at low frequencies. A broad, strong anechoic area appears at large incident angles and low frequencies; under these conditions, the displacements of the steel plate and the 2D cavity are the main components of structural vibration. The resonance moves to low frequency when the thickness of the steel plate is incorporated and the cavity height is increased. At relatively high frequencies, some new absorption areas result from the resonance of periodic cavities and cover the contribution from the high-order Lamb waves in the coating caused by attenuation. The corresponding absorption coefficients decrease with an increasing angle of incidence.
登录
查看更多内容
影响因子：
4.2
作者：
G. Gaunaurd
通讯作者：
G. Gaunaurd
DOI：
10.1016/s0165-2125(02)00008-2
发表时间：
2002
期刊：
--
影响因子：
--
作者：
L. Kari
通讯作者：
L. Kari
影响因子：
2.4
作者：
A. Hladky-Hennion;J. Decarpigny
通讯作者：
A. Hladky-Hennion;J. Decarpigny
DOI：
10.1121/1.2940577
发表时间：
2008-08
期刊：
The Journal of the Acoustical Society of America
影响因子：
--
作者：
F. Karpfinger;B. Gurevich;A. Bakulin
通讯作者：
F. Karpfinger;B. Gurevich;A. Bakulin
影响因子：
2.4
作者：
Chan, CW;Cawley, P
通讯作者：
Cawley, P