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

针对石膏板两叶构成的轻质双叶墙体，尝试建立高隔声性能测试装置。基本系统是由一个小的消声箱和双层叶墙组成的，在盒子上放一个间隔条保持一定的间隔。在这个研究中，改进是从形成浮动结构开始的，一个由丙烯酸制成的小消声盒由玻璃棉支撑在地板上，周围部分被空气空间/玻璃棉和隔音层包围。一层石膏板被首先使用。其次，将其改为纤维强化石膏板。经过多次试验，最终采用了纤维增强石膏板。通过这种简单的方法在高频范围内识别出约10dB的第一次改进。在正常入射声条件下，使用任何外层材料均可观察到超过1kHz频率范围内约60dB的衰减。此外，在水平声入射的情况下，在3-4kHz的频率范围内可以明显观察到巧合效应。接着，在两块石膏板之间放置木钉，进行了声桥效果的实验。本实验可以观察到随着隔声性能的下降而产生的效果。对玻璃棉在石膏板两叶间的插入效果进行了实验研究。结果表明，薄玻璃棉片之间无间隙的条件优于厚玻璃棉片之间有一定间隙的条件。获得了高隔声性能的测试设备和许多基本信息，达到了上述研究的目的。

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.