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Prediction of sound in long enclosures

机译：长围栏中声音的预测

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Despite a considerable improvement in computer performance and the accelerating development of many numerical methods, traditional scale modelling techniques and full-scale measurements are still popular for studying the sound fields in long enclosures. In the current study, the propagation of sound in a long enclosure was investigated both experimentally and theoretically. In the problem of interest, the length scale of the enclosure was much greater than that of the width and the height. Earlier studies mainly focused on the problem of predicting the attenuation of sound propagation in long enclosures by summing-sound intensities of all image sources. Only limited information on the effects of mutual interference caused by the direct and reflected rays were reported. Significant discrepancies between the predicted and measured noise levels were found, especially at low frequency region. To prove the robustness of the proposed numerical model, extensive full-scale field measurements in real built-up tunnels were conducted and used to compare with results due to predictions. The importance of the interference effects caused by the direct and reflected waves for the accurate prediction of sound fields in long enclosures was explored.
机译：尽管计算机性能相当大，但加速了许多数值方法的发展，但传统的规模建模技术和满量程测量仍然是研究长途外壳中的声场的流行。在目前的研究中，在实验和理论上在实验和理论上进行了长封闭式声音的传播。在感兴趣的问题中，外壳的长度尺度远大于宽度和高度。早期的研究主要专注于通过所有图像来源的求和强度预测长围栏中声音传播衰减的问题。报道了关于由直接和反射光线造成的相互干扰效应的有限信息。发现预测和测量噪声水平之间的显着差异，尤其是在低频区域。为了证明所提出的数值模型的稳健性，进行了真实内置隧道中的广泛的全尺度场测量并用于与由于预测导致的结果进行比较。探讨了由直接和反射波引起的干扰效应的重要性，以便精确预测长围栏的声场。

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