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Prediction of Structure-Borne Sound in Buildings Consisting of Various Building Elements, Generated by Underground Rail Traffic

机译：由地下铁路交通产生的各种建筑元素组成的建筑物中结构声音的预测

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The prediction of re-radiated structure-borne sound in large, complex buildings is a difficult task. Methods to do so exist from simple analytical formulae to full-size detailed numerical analysis of vibrations and re-radiated noise. Nevertheless, designers need an effective, practicable method to ensure that the interior noise of buildings planned above or in the vicinity of metro lines do meet the relevant limit values and to decide whether or not building base isolation is required. The paper summarizes a number of experiments performed in large portal frame buildings consisting of simultaneous vibration and noise measurements. It was established that the accuracy of the well-known Kurzweil formula is highly limited: the difference between measured and predicted sound pressure values is frequency dependent with positive values for low and negative values for higher frequencies, and the standard deviation of the predictions is high. The experimental findings were pursued by numerical calculations for a very simple model, consisting of various typical wall and floor slab materials and dimensions. It was found that the positive difference for low frequencies is mainly caused by weak fluid-structure coupling. The large spread is related to the highly modal behavior of both the involved structures and the acoustic field, resulting in strongly frequency-dependent sound radiation from the surrounding surfaces. As a result, an improved prediction formula is proposed on the basis of the comparison of measured and simulated difference curves.
机译：在大型复杂建筑物中重新辐射结构的声音预测是一项艰巨的任务。从简单的分析公式到全尺寸详细数值分析的方法存在于振动和重新辐射噪声的方法。尽管如此，设计师需要一种有效的，可行的方法，以确保在地铁线上或在地铁线附近的建筑物内部噪音确实满足相关的极限值，并决定是否需要构建基础隔离。本文总结了在包括同时振动和噪声测量的大型门框架建筑中进行的许多实验。建立了众所周知的Kurzweil公式的准确性高度有限：测量和预测的声压值之间的差异与较高频率的低和负值的频率相比，并且预测的标准偏差很高。通过数值计算来追求实验结果，这是一个非常简单的模型，包括各种典型的墙壁和地板板材和尺寸。发现低频的正差主要是由弱流体结构耦合引起的。大的扩展与所涉及的结构和声场的高模态行为有关，导致来自周围表面的强频率相关的声辐射。结果，基于测量和模拟差异曲线的比较来提出改进的预测公式。

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