Muxiao Li, Ziwei Zhu, Tiesong Deng, Xiaozhen Sheng*. An investigation into high-speed train interior noise with operational transfer path analysis method. Railway Engineering Science, 2021, 29(1): 1-14
https://doi.org/10.1007/s40534-021-00235-0

Fig. 5. Sound intensity maps of interior noise at 160 and 350 km/h.