چكيده به لاتين
The expansion and distribution of sound inside passenger cars due to the presence of corridors, cabins and various components is somewhat complex, which results in uneven distribution of energy and collapse of sound in corridors and cabins. For carriages, the effect of cabins, corridors and materials used in its design can play an important role in the production of sound field in the train due to the presence of noise (such as noise fans systems and rolling noise). For this reason, in order to predict the distribution of sound within the passenger wagons, one particular method should be used to examine the internal sound field and the parameters affecting it, so that, by examining the effective parameters, Improvement and development of acoustic comfort inside the railway car wagon. In this thesis, using a combination of ray tracing and image source based on the principles of optics physics, it examines the acoustic behavior of passenger cars and also optimizes the volume of received sound in the passenger wagon cabin based on the sources of noises such as fan noise and rolling noise It's been effortless. First by using the simulation of the sound source inside the passenger wagon with complete equipment and without equipment to validate the results of this combined method through conducting experiments, acoustic field measurements and Finally, with the change of materials and coefficients of absorption used in the carriage of the passenger train, optimization of the acoustic behavior of the passenger wagon has been made with respect to noise sources (rolling noise and fan noise). The three changes made in the materials used in the passenger wagon show that the amount of noise can be reduced from the sources of common rail noises inside the passenger car to 2 dB
Keywords: Geometrical acoustics, Ray tracing, Image source, Hybrid method, coefficient absorption
