Structural Integrated Design Of Vector Hydrophone Based On Piezoelectric Disk

As we all know,the emergence of vector hydrophones has improved the information used to describe the sound field underwater.In particular,vector hydrophones have the advantages of low operating frequency,high sensitivity,and good directivity.Therefore,they have been used in various fields of underwater acoustic engineering.It has a wide range of applications,especially with the continuous development of vector hydrophone array technology,its advantages in underwater remote detection are more prominent.The thesis studies the method of integrated design of the sound pressure channel and vector channel of the vector hydrophone based on the tri-stack as the sensitive device,so as to improve the consistency between the channels,so as to provide technical support for the further engineering application of the vector array.The thesis starts from the study of the basic theory of elastic vibration of a single metal disc and piezoelectric disc,and at the same time,it is working on a bending sound pressure hydrophone designed based on three stacks(composed of a metal disc and two piezoelectric discs).Based on the theoretical analysis of the sensitivity of(sound pressure channel)and curved accelerometer(vector channel),a new type of curved vector hydrophone composed of three three laminations is proposed,one of which is used as the vector The sensitive element of the vector channel of the hydrophone is used to obtain the vibration acceleration information of the underwater particle;the other two tri-stacks are connected in parallel as the sensitive element of the sound pressure channel to obtain the underwater sound pressure information;and the three three-stacks Share a rigid support frame,thereby realizing the structural integration design of the vector channel and the sound pressure channel,which not only reduces the mass and volume of the vector hydrophone,but also improves the performance between channels due to the use of the same sensitive components and structure.The consistency is better.The thesis uses COMSOL Multiphysics finite element analysis software.First,the two channels constituting the new vector hydrophone are independently optimized and designed,including the thickness-to-diameter ratio of the piezoelectric ceramic disc,and the ratio of the piezoelectric disc to the metal disc radius.The effect of geometrical size on the modal and characteristic frequency of the two channels,electrical admittance and sensitivity frequency response characteristics and other related parameters,the purpose is to provide an optimal basis for the integrated design of the vector hydrophone;secondly,the proposed new vector hydrophone The overall structure of the modal and harmonic response characteristics simulation study;finally,the thesis developed three different sizes of vector hydrophone samples,and their performance was tested.The test results show that within the working frequency range,the sound pressure channel sensitivity of the three vector hydrophone samples are-208 d B and-200 d B respectively(after inspection,there is a sound pressure channel failure of the vector hydrophone),and the vector channel is at 1k Hz The sensitivities are-215 d B,-212 d B,-218 d B(0d B=1V/?Pa),and conform to the trend of increasing 6d B per octave with frequency;meanwhile,the sound pressure and vector channel of the three vector hydrophone samples are all It has good directivity characteristics,the directivity of the vector channel is cosine,and the consistency between the sound pressure and the vector channel is good.