水声无源材料插入损失虚拟聚焦测量方法  

Virtual focusing measurement method for insertion loss of underwater acoustic passive materials

作　　者：吴登苍 王月兵 WU Dengcang;WANG Yuebing(College of Metrological Technology and Engineering,China Jiliang University,Hangzhou 310018)

机构地区：[1]中国计量大学计量测试工程学院,杭州310018

出　　处：《声学学报》2021年第2期237-245,共9页Acta Acustica

摘　　要：提出了一种适合在有限尺寸水池中测量水声材料插入损失的方法,称为"虚拟聚焦法"。该方法利用一弧形发射阵以一定规则对样品进行扫描,通过对接收数据进行叠加处理,使得同频声干扰贡献随机化和无规则化,从而提取出反映材料声参数的透射波信号。在尺寸为5.5 m×3.5 m×3.5 m的非消声水池,测量频率为2~15 kHz,对1.1 m×1 m×8 mm标准铝板样品和1 m×1 m×35 mm聚氨酯材料样品进行了测量,结果表明测量值与理论值有较好的吻合,测量不确定度为2.0 dB(k=2)。A method suitable for measuring the insertion loss of underwater acoustic materials in a pool of limited size was proposed,which is called "virtual focusing method".This method uses an arc-shaped emission array to scan the sample with certain rules.By superimposing the received data,the contribution of the samefrequency acoustic interference is randomized,thereby extracting the transmitted wave signal reflecting the acoustic parameters of the materialsIn a 5.5 m × 3.5 m × 3.5 m non anechoic water tank,the measurement frequency is 2~15 kHz and the insertion loss of the samples of 1.1 m × 1 m × 8 mm standard aluminum plate and 1 m × 1 m × 35 mm polyurethane material were measured.The results show that the measurement values were in good agreement with the theoretical values,and the measurement uncertainty is 2.0 dB(k=2).

关 键 词：插入损失 测量不确定度 随机化 测量频率 聚氨酯材料 水声材料 接收数据 透射波 

分 类 号：TB564[交通运输工程—水声工程]