水声管声学层无背衬声阻抗测试方法研究（英文）  

Measurement Method of Sound Impedance of Acoustic Coating in Water-tube without Back Layer

作　　者：白振国 胡东森[1,2] 沈琪 余晓丽 BAI Zhen-guo;HU Dong-sen;SHEN Qi;YU Xiao-li(National Key Laboratory on Ship Vibration&Noise,Wuxi 214082,China;China Ship Scientific Research Center,Wuxi 214082,China)

机构地区：[1]船舶振动噪声重点实验室,江苏无锡214082 [2]中国船舶科学研究中心,江苏无锡214082

出　　处：《船舶力学》2018年第12期1575-1584,共10页Journal of Ship Mechanics

摘　　要：为测试声学层阻抗特性,提出了不依赖于背衬的利用声学层上下界面声压及振速计算其声阻抗的测试原理,针对水声声管建立了无刚性背衬的声学层阻抗测试方法。利用数值仿真验证了测试系统的测试精度,并对水听器间距、安装位置偏差及水听器相位偏差产生的测试误差进行了计算分析,验证了测试方法的精度。针对测试系统低频测试误差提出了改进方案,可降低测试系统的有效测量频段。To obtain the sound impedance of underwater acoustic coating,a sound impedance measurement method in water-tube without back layer is proposed.Formulas of the measurement method utilizing sound pressure of four hydrophones mounted in the water-tube are derived,and hence a measurement method is established.Then a numerical simulation of the measurement processing is carried out to validate the measurement method.And the measurement error caused by distance arrangement,mounting position and phase error of hydrophones is investigated by the simulation,after that,the modification of the measurement system is presented to lower the inferior limit frequency.

关 键 词：声学层 声阻抗 测试方法 误差分析 

分 类 号：TB52[理学—物理]