| Summary: | 碩士 === 國立臺灣海洋大學 === 系統工程暨造船學系 === 100 === Abstract
Owing to the emerging demand of higher required standard of the environmental sound quality, the reduction of floor impact noise of high-rise buildings have become a hot issue. It is very difficult to change the main structure of a completed building to reduce the structure-borne vibration noise. One feasible way is to install raised floors as an additional sub-structure together with some isolators. This paper is mainly discussing the impact sound insulation of the effect of raised floors. At the first step, the vibration, radiated sound and mobility spectra of the raised floor and the support RC floor are measured by a standard tapping machine and a hammer. The exciting impact force is assessed and ascertained by the method of EMA (experimental modal analysis). Simulation of the vibration of both raised floor and RC support floor is conducted by the software package ANSYS and the radiated sound field is analyzed by the software SYSNOISE. The comparisons of the simulation results of vibration and noise with that by measurement have been discussed. Meanwhile, the sound isolation of the RC floor with and without raised floor has been characterized. The study shows impact force applied on different base by the same tapping machine may be different, thus in simulation modeling for the analysis of the impact sound insulation of floors in comparing with the test based on the standard tapping machine method the first step is necessary to correctly input the impact force.
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