| Summary: | 碩士 === 國立臺灣大學 === 工程科學及海洋工程學研究所 === 107 === The purpose of this research is to discuss the sound insulation of double-leaf panel. In the actual production of panels and experimental measurements, the middle part of the double-leaf panel needs to be connected by studs. Then the way of connection divided of points and line. The sound insulation quantity of different connection methods is not the same. In this thesis, we use the governing equation to simulate the sound insulation performance of double-leaf panel, while the middle structure is simulated by springs. With the difference of the incident frequency, the stiffness of the spring is also different. Based on the literature proposed to distribution of spring stiffness values, into the theoretical calculation to simulate the sound insulation performance of double-leaf panel.
To order to verify the present method, citing data measured by NRCC. The comparison of the transmission loss between experimental data and numerical predictions is reliable. Using the present method, several cases are set up to investigate related parameters of double-leaf panel, such as thickness, density, stud spacing, distance between two panels and add some porous between two panels. The numerical results show that the coincident frequency will change with different thickness of the panel. Finally, theoretical analysis show that add porous to the structure can increase the sound insulation by about 5 dB.
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