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Experimental study of noise mitigation measures on a slab track

机译：板式轨道噪声缓解措施的实验研究

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Slab track is generally noisier than conventional ballasted track, so noise control measures that can be applied to a slab track are of great importance. Several noise control treatments have been studied under controlled conditions through experiments on a 1:5 scale model slab track with and without the presence of a train body. These treatments consist of absorptive rubber mats applied to the surface of the slab and a low noise barrier introduced close to the track. The noise reduction is evaluated experimentally by using a reciprocal method and compared with the results of numerical simulations. The insertion loss spectra of these treatments have been combined with predicted train pass-by spectra to determine the potential overall noise reductions. It has been found that the absorptive treatment alone has only a small effect on the radiated noise from the track. This is increased by the presence of the train body leading to a reduction of up to 2-3 dB at a standard receiver height of 1.2 m, which suggests that the absorptive layer controls reflections between the car body and the track. All the treatments considered have a greater effect on the noise radiated by the lateral vibration of the rail than on that from the vertical vibration. Their effectiveness mostly increases, by between roughly 0.5 and 1.5 dB, as the train speed is increased from 80 to 300 km/h. As expected, the noise barrier is more effective at lower receiver positions than at higher ones but its effectiveness is reduced by 1-2 dB by the presence of the train body. However, in combination with the absorptive treatment, its effectiveness increases when the train body is present. This shows the importance of including of the presence of the train body in evaluating the effects of acoustic treatments in the track. (C) 2020 Elsevier Ltd. All rights reserved.
机译：平板轨道通常比传统的镇流轨道闹剧，因此可以应用于板式轨道的噪声控制措施非常重要。通过在1：5级模型板轨道上的实验和没有火车体的存在，通过实验研究了几种噪声控制处理。这些处理包括吸收橡胶垫，其施加到板坯表面和靠近轨道的低噪声屏障。通过使用往复方法实验评估降噪，并与数值模拟的结果进行比较。这些处理的插入损耗谱与预测的列车通过光谱结合，以确定潜在的整体噪声减少。已经发现，单独的吸收治疗仅对来自轨道的辐射噪声具有小效果。这通过火车体的存在导致在标准接收器高度为1.2米的标准接收器高度降低到高达2-3dB的增加，这表明吸收层控制了车身和轨道之间的反射。所考虑的所有处理对通过垂直振动的横向振动辐射的噪声具有更大的效果。它们的有效性大多数增加，大约在0.5和1.5 dB之间，因为火车速度从80到300 km / h增加。正如预期的那样，噪声屏障在较低的接收器位置比在较高的位置更有效，但由于火车体的存在，其有效性降低了1-2dB。然而，与吸收治疗结合，当出现火车体时，其有效性增加。这表明包括列车体在评估轨道中的声学处理的影响方面的存在的重要性。 （c）2020 elestvier有限公司保留所有权利。

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