Abstract An approach is presented for modelling the noise propagation beneath the train floor and this is applied to rolling noise sources. It is assumed that the sound incident on the train floor is made up of a direct and a reverberant component. A combination of two numerical modelling approaches is considered to deal with these: an equivalent source model, to represent the direct component, and statistical energy analysis (SEA) for the reverberant part. In the equivalent source model, the wheel is replaced by monopole and dipole sources, which represent its radial and axial radiation. The rail vertical vibration and the sleepers are replaced by arrays of monopole sources while the rail lateral vibration is replaced by an array of lateral dipoles. The sound power of the rolling noise is obtained by using the TWINS model. In the SEA model, the region beneath the train floor is divided into several volumes and the power input to these subsystems is assumed to be due to the first reflections from the train floor and the ground. The reverberant and direct sound have very similar contributions to the total sound power incident on the train floor although this depends on how the equipment is arranged beneath the train. The modelling approach is verified by comparing the predicted sound pressure levels with laboratory measurements and with field tests.

中文翻译：

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使用统计能量分析和等效源模型研究铁路车辆下方的声传输

摘要 提出了一种模拟列车地板下噪声传播的方法，并将其应用于滚动噪声源。假设在火车地板上入射的声音由直达声和混响声组成。考虑结合两种数值建模方法来处理这些问题：等效源模型，表示直接分量，以及混响部分的统计能量分析 (SEA)。在等效源模型中，轮被单极和偶极源代替，代表其径向和轴向辐射。钢轨垂直振动和轨枕由单极源阵列代替，而钢轨横向振动由横向偶极子阵列代替。滚动噪声的声功率是通过使用 TWINS 模型获得的。在 SEA 模型中，火车地板下方的区域被分成几个体积，这些子系统的功率输入假设是由于火车地板和地面的第一次反射。混响声和直达声对列车地板上入射的总声功率的贡献非常相似，尽管这取决于设备在列车下方的布置方式。通过将预测的声压级与实验室测量值和现场测试进行比较来验证建模方法。混响声和直达声对列车地板上入射的总声功率的贡献非常相似，尽管这取决于设备在列车下方的布置方式。通过将预测的声压级与实验室测量值和现场测试进行比较来验证建模方法。混响声和直达声对列车地板上入射的总声功率的贡献非常相似，尽管这取决于设备在列车下方的布置方式。通过将预测的声压级与实验室测量和现场测试进行比较来验证建模方法。