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Prediction and Control of Rolling Noise in Buildings

出版	2020
URL	http://books.google.com.hk/books?id=c6dazgEACAAJ&hl=&source=gbs_api

註釋New buildings in urban areas are divided into commercial and residential areas. Commercial stores are generally located on the ground floor, private residences on the upper floors. This use has revealed critical disturbances due to noise generated by delivery carts when buildings are mainly occupied (e.g. early morning). These carts generate low frequency vibrations (less than 100 Hz) which easily propagate through the building structure and to the upper floors, disturbing the residents therein. While work has been done to study impact noise, little research has been done in the area of rolling noise in buildings. This thesis presents an original model for rolling noise in buildings: taking into account the influencing factors such as the roughness of the wheel and floor, the material properties of the wheel and floor, the speed of the trolley, and the load on the trolley. Discrete irregularities, such as wheel flats and floor joints, are also taken into account. The model is capable of capturing the physical phenomena present in the rolling contact indoors, as well as estimating the relative noise benefit of adding a floor covering to a given floor system. The model can be used as a tool to study how different flooring systems (including multi-layer systems) respond to rolling excitation, with the aim of developing multi-story building solutions that are better equipped to combat this type of noise source.