摘要
水声材料的许多声学特性一般可以通过对复反射系数和透射系数计算得到。本文提出一种新的自由场测量方法，即应用宽带脉冲压缩技术在消声水池中测量有限尺寸的大面积材料样品的性能参数，从而使这种标准测量的低频限被明显降低。除传统的回声降低和插入损失参数等外，两个新的参数——消声系数和去耦系数也在评价之列。文中对两块平板样品进行了实验测量，其尺寸约为１ｍ×１ｍ，测量频率范围为 ２～ ２０ｋＨｚ。
A number of acoustic characteristics of underwater acoustic materials can be evaluated by their complex reflection and transmission coefficients. In this paper, a new method is proposed for the measurements of the performance parameters of finite sized large area material samples in free field by using broadband pulse compression technique, therefor the low-frequency cutoff of the standard tests are obviously reduced. Apart from conventional parameters such as echo reduction and insertion loss, etc, two new anechoic and decoupling coefficients are also assessed. The experimental measurements are performed for two actual panels of about 1m×1 m in the frequency range of 2 ~ 20 kHz.
出处
《声学学报》
EI
CSCD
北大核心
2000年第3期248-253,共6页
Acta Acustica
关键词
水声材料
自由场
宽带压缩脉冲叠加法
Acoustic fields
Acoustic variables measurement
Compressibility
Materials
