用于矢量水听器的加速度敏感结构  

Acceleration Sensitive Structure for Vector Hydrophone

作　　者：王文龙 笪良龙[1,2] 孙芹东 WANG Wenlong;DA Lianglong;SUN Qindong(Department of No.2,Naval Submarine Academy Qingdao,266199,China;National Laboratory for Marine Science and Technology Qingdao,266235,China)

机构地区：[1]海军潜艇学院二系,青岛266199 [2]海洋科学与技术国家实验室,青岛266235

出　　处：《振动．测试与诊断》2021年第4期778-783,835,共7页Journal of Vibration,Measurement & Diagnosis

基　　金：国家重点研发计划资助项目(2019YFC0311700)。

摘　　要：同振式矢量水听器中常用的商用压电加速度计具有质量较大的缺点,限制了矢量水听器的性能提升。为了解决该问题,设计了一种三轴加速度敏感结构,采用厚度剪切压电效应,具有质量轻、灵敏度高等优点。该加速度敏感结构的质量仅为0.039 kg,灵敏度在200 Hz处约为3000 mV/g,工作频段为20~2000 Hz,工作频段内最大横向灵敏度比小于8%。将该加速度敏感结构安装在球形耐压矢量水听器中进行测试,其直径为72 mm,x,y,z通道在200 Hz处的等效声压灵敏度级分别为-191.6,-191.4和-191.8 dB,具有良好的余弦指向性,各通道一致性较好,证明其适合应用在矢量水听器中。并与安装商用加速度计的矢量水听器进行对比,证明其能够有效降低矢量水听器的平均密度,提高灵敏度。The commercial piezoelectric accelerometers used in co-vibrating vector hydrophones have the disadvantage of large mass,which limits the performance of vector hydrophones.In this paper,an acceleration sensitive structure based on thickness shear piezoelectric effect is designed,which has the advantages of light weight and high sensitivity.The mass of the acceleration sensitive structure is 0.039 kg.Working frequency band is 20~2000 Hz.It’s sensitivity is about 3000 mV/g at 200 Hz.And the maximum lateral sensitivity ratio in working frequency band is less than 8%.A spherical vector hydrophone with the acceleration sensitive structure is tested,which is 72 mm in diameter,the working frequency band is 20~2000 Hz,and the equivalent sound pressure sensitivity of x,y and z channel are-191.6 dB,-191.4 dB and-191.8 dB at 200 Hz,with direction performance of cosine and good consistency.Test results show that this acceleration sensitive structure is suitable to be used in vector hydrophones.Compared with the vector hydrophone with commercial accelerometer,it is proved that this acceleration sensitive structure can effectively reduce the average density and improve the sensitivity of the vector hydrophone.

关 键 词：压电加速度计 厚度剪切 有限元仿真 同振式矢量水听器 

分 类 号：TH824.4[机械工程—仪器科学与技术]