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DEVELOPING STUDY ON EVALUATION METHODS OF SOUND INSULATION CHARACTERISTICS OF PLATES USING SMALL AREA MATERIALS AND TRANSFER FUNCTION ANALYSIS

小面积材料板材隔声特性评价方法及传递函数分析的开展研究

基本信息

批准号：
08555144
负责人：
IWASE Teruo
金额：
$ 4.74万
依托单位：
Niigata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

A very simple evaluation method of sound insulation characteristics of a palate was proposed. By this method, sound insulation characteristics could be observed from transfer functions of transmitted sound through a test plate with small area or exited vibration on it against incident sound just to the surface of the plate.A new method could be carried out in semi-free field by using the technique receiving only transmitted sound and reducing diffraction sound to the behind.Therefore, it had not necessity of special acoustical test room such as anechoic room or reverberation room. The tests under not only normal incident condition but also oblique incident angle condition could be carried out. From several tests, in a typical room in a building, on such as glass plate, gypsum board and plywood boards with square size of 900mmx900mm and supported at their four corner edges, following results were obtained.At first, sound insulation characteristics similar "transfer functions" could be observed by comparing the analyzed results. Secondly, coincident effects for each material or for each incident angle were shown as the higher peak, meaning strong sound transmission, and lower peak, meaning not so clear effect, in transfer functions at high frequency range. Also frequency changes of the peak caused by coincidence effect could be clearly shown for each sound incident angle condition.As for two leaf plate walls, using small anechoic chamber was also tested to insulate and to reduce direct and diffraction sound pressures on receiving side plate. By this method, resonance transmission effects in low frequency and their frequency changes with setting conditions could be observed. As the conclusion, the new method is useful in design or developing process of dry board walls.

提出了一种非常简单的腭板隔声性能评价方法。该方法可以从透射声通过小面积试板或试板上的激励振动对入射声的传递函数来观察试板的隔声特性，从而为在半自由声场中采用只接收透射声而将衍射声减少到后面的技术提供了一种新的方法，它不需要专门的声学测试室，如消声室或混响室。不仅可以进行正入射条件下的测试，而且可以进行斜入射条件下的测试。通过对一个典型建筑房间内的玻璃板、石膏板和胶合板等四角支撑的试验研究，得到了如下结果：首先，通过比较分析结果，可以观察到类似于"传递函数"的隔声特性;第二，对于每种材料或对于每个入射角的重合效应表现为在高频范围内传递函数的较高峰值，这意味着强的声音传输，而较低的峰值，这意味着不那么明显的效果。对于两个叶片壁板，还进行了用小型消声室隔离和降低接收侧板上的直达声压和衍射声压的试验。通过这种方法，可以观察到低频的共振透射效应及其频率随设置条件的变化。该方法对干板墙的设计和开发具有一定的参考价值。