Database for RailRad calculation method for simulating sound radiated by railway track vibrations

This dataset contains precalculated acoustic transfer functions for efficiently calculating the sound radiated by railway track vibrations. The transfer functions contained in each file describe the complex sound pressure produced at a number of receiver locations given a unit velocity at a source element on the railway track surface, per frequency and at a fixed wavenumber along the track. Four different acoustic geometries are included: (1) a standard UIC60 rail in free space, (2) the rail in an acoustic half space, (3) the rail located above a slab track surface, and (4) identical geometry to (3) but including an acoustically hard hull of a passenger train geometry above the track. More information about the exact location of source and receiver coordinates can be found in the .hdf5 files, in the subgroup 'info'. The transfer functions themselves are located in the dataset 'tfs', which are matrices of size (Number of frequency lines x number of sources x number of receivers). More information can be found here https://github.com/janniktheyssen/railrad This collection of databases is part of ongoing work at CHARMEC / Chalmers University of Technology, Gothenburg, Sweden (https://www.charmec.chalmers.se/). Parts of the study have been funded from the European Union's Horizon 2020 research and innovation programme in the In2Track3 project under grant agreements No 101012456. The computations were enabled by resources provided by the Swedish National Infrastructure for Computing (SNIC), partially funded by the Swedish Research Council through grant agreement no. 2018-05973.本数据集包含预计算的声学传递函数（acoustic transfer functions），用于高效计算铁轨振动辐射的声波。各文件内的传递函数描述了：在给定铁轨表面某源单元单位振动速度的前提下，沿轨道方向取固定波数，针对每个频率，在多个接收测点位置产生的复声压（complex sound pressure）。本次数据集涵盖四种不同的声学几何场景：(1) 自由空间中的标准UIC60钢轨；(2) 处于声学半空间（acoustic half space）中的钢轨；(3) 铺设于板式轨道（slab track）表面上方的钢轨；(4) 与场景(3)几何参数一致，但在轨道上方增设了客运列车的声学硬车体（acoustically hard hull）结构。关于源与接收坐标的确切位置，可在.hdf5文件的`info`子组中查阅。传递函数本体存储于数据集`tfs`中，其矩阵维度为（频率点数 × 源数量 × 接收测点数量）。更多详细信息可参阅：https://github.com/janniktheyssen/railrad。本数据集集合隶属于瑞典哥德堡查尔姆斯理工大学CHARMEC实验室的在研项目（https://www.charmec.chalmers.se/）。本研究部分工作由欧盟地平线2020研究与创新计划下的In2Track3项目资助，资助协议编号为101012456。本计算工作依托瑞典国家计算基础设施（Swedish National Infrastructure for Computing，SNIC）提供的算力资源完成，该基础设施部分由瑞典研究理事会（Swedish Research Council）通过编号为2018-05973的资助协议提供支持。