脉冲法在现场声反射测量中的应用

本文运用电火花声源在一厅堂内对胶合板条和钢板网组成的顶棚以及胶合板贴在混凝土墙面上构成的反射板进行了声反射特性的实验研究。在测试人射和反射声脉冲而利用FFT计算声反射传递函数时,讨论了反射脉冲序列截取的长短对该材料反射传递函数的影响。文中还分析了有肋吸声结构声反射传递函数的变化。提供0°、30°、60°反射传递函数的比较。

APPLICATION OF IMPULSE METHOD TO IN SITU MEASUREMENT OF SOUND REFLECTION

This paper presents an experimental study on the reflection of sound pulse from reflected ceiling and walls in a hall by using an electric spark source. The ceiling consists of plywood ribs and wire meshes and the reflected walls are concrete sticked with plywood facing. The transfer functions of reflected sound, waves were calculated from the experimental incident and reflected sound pulses by use of FFT. The effects of the pulse series length on the transfer function are discussed. The changes of the transfer functions of reflected sound waves were analysed in the case of absorption structure with ribs. The transfer functions of reflected sound wave for 0, 30, 60 degree incident angles are given.