Calculation of the random-incidence scattering coefficients of a sine-shaped surface
Calculation of the random-incidence scattering coefficients of a sine-shaped surface
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正弦形表面随机入射散射系数的计算
DOI：
10.1121/1.1915600
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发表时间：
2006
影响因子：
--
通讯作者：
T. Sakuma
中科院分区：
文献类型：
--
作者：
J. Embrechts;L. D. Geetere;G. Vermeir;M. Vorländer;T. Sakuma
在混响室（ISO 17497-1）中测量了特定正弦曲面的随机入射散射系数，并与理论结果进行了比较。Holford-Urusovskii法和混合平面波分解-有限元法分别应用于具有相同轮廓的无限正弦曲面，而三维边界元法给出了有限尺寸曲面的数值结果。在所有计算中均假定完全刚性（诺伊曼边界条件）。根据所涉及的近似，对计算的有效性进行了比较和讨论。最后，对散射系数的实测值和计算值进行了比较。发现了一个很好的对应关系，特别是关于对频率的总体依赖。然而，在低频率和高频率下都观察到小的偏差。它们将由测量中的不确定度和计算中的离散误差来解释。
Random-incidence scattering coefficients obtained by measurement in reverberation chambers (ISO 17497-1) for a particular sine-shaped surface are compared with theoretical results. Holford-Urusovskii's method and a hybrid plane wave decomposition - FEM method are applied to an infinite sine-shaped surface having the same profile, while the 3D BEM gives numerical results for the finite-size surface. Perfect rigidity (Neumann boundary condition) is assumed in all computations. The validity of the computations is compared and discussed with regard to the approximations involved. Finally, the measured and calculated values of the scattering coefficients are compared. A good correspondence is found, in particular concerning the overall dependence on frequency. Small deviations have however been observed, at low as well as at high frequencies. They will be explained by uncertainties in the measurements and discretisation errors in the calculations.