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

尝试建立轻质双层隔声墙隔声性能测试装置，基本系统由小型消声箱和隔音板间隔保持一定间隔的双层隔音墙组成。本研究从形成浮动结构入手，将压克力制成的小型消声箱用玻璃棉支撑在地板上，圆周部分用空气空间/玻璃棉和隔音层包围。首先用石膏板作为铺层材料。接下来，改成纤维增强石膏板。经过多次试验，最终采用纤维增强石膏板。通过这样一种简单的方法，在高频范围内识别出了大约10dB的第一批改善。当使用任何外层材料时，在正常入射条件下，在1 kHz以外的频率范围内可观察到约60db的衰减，而且在3-4 kHz的频率范围内，当水平入射时，可观察到明显的符合效应。接下来，它尝试了通过在两块石膏板之间放置一个木钉来实现声桥效果的实验。本实验观察到隔声性能下降的影响，并进行了玻璃棉插入石膏板两片之间的效果实验。结果表明，薄玻璃棉板之间无间距的条件优于厚玻璃棉板之间有一定间距的条件。获得了高隔音性能的测试装置和许多基础信息，达到了上述目的。

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.