Study on developing of test method for sound insulation characteristics of light leaf double wall and its applications to realize highly efficient wall structures.

本文尝试建立一种测量双层石膏板轻质墙体隔声性能的装置，其基本系统由一个小型消声箱和双层石膏板组成，双层石膏板轻质墙体与消声箱之间有一定的间隔，在本研究中，改进从形成浮动结构开始，因为由丙烯酸制成的小消声箱由玻璃棉支撑在地板上，周围部分由空气空间/玻璃棉和隔音层包围。首先将石膏板用于层。接下来，改为纤维增强石膏板。经过试验，最终采用纤维增强石膏板。通过这种简单的方法在高频范围内识别出约10 dB的第一次改进。在正常声入射条件下，无论采用哪种外层材料，在1 kHz以上的频率范围内都能观察到约60 dB的衰减，而在水平声入射条件下，在3-4kHz的频率范围内也能观察到明显的重合效应。其次，尝试了在两块石膏板之间插入木栓的声桥效应实验。本实验可以观察到隔音效果下降的情况，并对玻璃棉在石膏板两叶之间的插入效果进行了实验。结果表明，薄玻璃棉板间无间距的情况上级厚玻璃棉板间有一定间距的情况，获得了高隔声性能的试验装置和大量的基础资料，达到了本研究的目的。

It was tried that the establishment of apparatus to measures high sound insulation performance for the light weight the double leaf wall composed of two leafs of gypsum board.The basic system was made by a small anechoic box and by double leaf wall with some interval kept by a spacer putted on the box.In this study, improvements were started from forming the floating structure as that a small anechoic box made of the acrylic was supported by glass wool on a floor, and circumference part is surrounded by air space/glass-wool and a sound insulation layer. A gypsum board was used for the layer first. Next, it was changed to the fiber strengthening gypsum board. After some experiments, a fiber strengthening gypsum board was finally used. The first improvements of about 10dB were recognized by such a simple way in high frequency range. The attenuation of about 60dB in the frequency range beyond 1kHz could be observed at the normal condition of sound incidence when any outside layer material was used.Furthermore, it became possible that a coincidence effect was observed clearly in the frequency range of 3-4kHz in case of a horizontal sound incidence. Next, it tried the experiment of the sound bridge effect by a wooden stud putted between two gypsum boards. The Effect as the declined sound insulation could be observed this experiment.Experiments on the insert effect of glass wool between two leafs of gypsum boards were carried out, too. It could be found the condition with no space between thin glass wool sheets was superior to the condition with certain spaces between thick glass wool sheets.Test apparatus and much fundamental information for high sound insulation performance were obtained The purpose of this study was attained as described above.