Surface waves over periodically-spaced strips
Surface waves over periodically-spaced strips
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周期性间隔条带上的表面波
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
K. Attenborough
中科院分区：
文献类型：
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作者：
I. Bashir;S. Taherzadeh;K. Attenborough
在声学硬表面上，对由平行间隔矩形条（宽：0.0126 m，高：0.0253 m）组成的表面进行了频域和时域测量。条带之间的边到边间距在0.003和0.06 m之间变化。频域预测表明，当间距是小的，这些表面可以被视为局部反应的刚性框架的硬背裂缝孔隙层的有效深度略大于带的高度，但当间距是可比的带的高度或更大，表面表现为周期性的粗糙表面。频域和时域的结果表明，表面波的可比幅度的范围内的条间距的研究，但声学引起的表面波的频率内容的平均间距的增加而减少。结果表明，有效阻抗谱比裂缝-孔隙层阻抗模型能更好地预测面波频散。
Frequency- and time-domain measurements have been made on surfaces composed from parallel periodically-spaced rectangular strips (width: 0.0126 m, height: 0.0253m) on an acoustically hard surface. The edge-to-edge spacing between the strips has been varied between 0.003 and 0.06 m. Frequency domain predictions show that when the spacing is small, these surfaces may be regarded as locally reacting rigid-framed hard-backed slit-pore layers with an effective depth slightly larger than the strip height, but when the spacing is comparable to the strip height or greater, the surfaces behave as periodically rough surfaces. Both frequency- and time-domain results show that surface waves of comparable magnitudes are created over the range of strip spacings studied but the frequency content of the acoustically induced surface waves decreases as the mean spacing is increased. It is found that surface wave dispersion is better predicted by the deduced effective impedance spectrum than by the slit-pore layer impedance model.