Simulation of Indoor Sound Wave Propagation using 2.5D SBR-Image Method

• Main Authors: Chiang, I-Ting, 江怡霆
• Other Authors: Shyh-Kang Jeng
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/21489825061481380074

碩士 === 國立臺灣大學 === 電機工程學系 === 86 === In this thesis,we will propose a method,the 2.5D SBR-image method, to simulate sound wave propagation in a large empty room.First,we simplify a 3D problem into a 2D one by initially neglecting the third dimension.Then,we shoot 2D ray tubes from a sound source until it hits a wall which we assume to be a rigid wall in most cases for simplicity.In accordance with the law of reflection,we can trace the ray tube in its new direction towards the next wall.In every bounce, we have to examine if the receiver falls within the ray tube.Once it does,an exact 2D ray path is determined and we consider the effect of the third dimension at the same time.Finally,we calculate the field due to the correspondent image along the real 3D ray path.This procedure repeated until all of the ray tubes have been traced.By superposition, we are able to calculate the contribution of every equivalent sound source individually.Compared with the original 3D SBR-image method, 2.5D SBR-image method is more efficient and time-saving.By this method, we computed the distribution of sound pressure in different kinds of buildings.The results are rather satisfactory.