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The acoustical criteria to be applied for design and assessment of subway stations are well defined by Environmental Noise Control Act of Turkey, since 2005. In the architectural design phase, the material and geometrical attributes are adjusted to fit related criteria mostly by application of ray tracing simulations. Reverberation time and sound pressure levels are two major indicators. The basic limitation of ray tracing is that the method is more valid as the sound field is closer to a diffuse field. Subway stations, on the other hand, are longitudinal volumes and depending upon the source location the sound does not always evenly distributed. This problem appears when subsequent field tests are compared to the simulation results. For this reason, in this research, an alternative method is searched namely, diffusion equation modeling, in order to better estimate the acoustical parameters in such disproportionate rooms. Some cases of İstanbul Subway lines are selected to compare ray tracing and diffusion equation model solutions. The outcomes of this study will aid the future investigations on both subway station acoustics and diffusion equation model applications.
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