Research On Conformal-drive Transducer With Carbon Fiber Composite Shell

Conformal-drive transducer is a new type of low-frequency bending transducer,which has significant performance advantages such as low resonant frequency,small size and volume,and high radiated sound power.Carbon fiber reinforced resin based composite materials are a new type of material with low density and high strength.With the progress of domestic production and processing capabilities,they have been used as substitutes for metal materials in many fields such as aerospace,automobiles,and ships,and have achieved significant results.Applying carbon fiber composite materials instead of metal materials in the production of underwater acoustic transducer structures can effectively reduce the total weight of the transducer and achieve more excellent performance.This article mainly combines the advantages of conformal-drive and carbon fiber materials to design a conformal-drive oval-ring transducer for carbon fiber shells.It conducts research on how to reduce resonance frequency,reduce mechanical Q value,reduce volume and weight,and achieve low-frequency and high-power emission performance in small sizes.Build sound sources for systems with high quality factors and low space occupancy.The application analysis of carbon fiber composite materials in underwater acoustic transducers has been less studied in the past,and there are few ANSYS analysis research literature.However,the ANSYS modeling process is not intuitive,and the details of the layered structure are not clearly depicted.This article first conducts research on a reasonable and accurate analysis method for conformal-drive carbon fiber shell transducers based on COMSOL finite element software.Firstly,the performance advantages and structural characteristics of carbon fiber composite materials were introduced,and the relevant theoretical derivation of the classical laminated plate theory of composite materials was carried out.The forming process and basic simulation analysis methods of carbon fiber composite materials were provided.Then,ANSYS and COMSOL finite element software were used to analyze the same size carbon fiber shell transducer,and the simulation results were compared to verify the reliability of using COMSOL software to analyze and design.Thus,COMSOL will continue to be used to study the impact of size parameters,driving methods,and laying methods of carbon fiber shell transducers on the emission voltage response of the transducer.Based on the research results,the transducer will be optimized and designed,and methods to reduce frequency and increase radiated sound power will be summarized.Performance comparisons will be made with aluminum alloy shell transducers of the same shell structure size,The resonant frequency of the carbon fiber shell oval-ring transducer is reduced by about 15% compared to the aluminum alloy shell,and the mechanical Q value is reduced by 43.5%.The bandwidth characteristics are improved.Finally,the production and performance testing of a prototype of a carbon fiber shell conformal-drive oval-ring transducer were completed.The test results show that the maximum size of the transducer body is 360 mm,the weight is 7.0kg,the resonance frequency in water is 340 Hz,and the maximum emission voltage response level is126.4d B.The results show that the transducer has achieved the expected low-frequency small-scale design.By comparing the test results of different driving modes of the prototype,the optimized design rules of the driving mode obtained from simulation were verified.Removing some piezoelectric ceramics with small displacement contributions can improve the performance of the transducer.Compared with the simulation results,there are some differences in the resonance frequency and emission voltage response values,mainly caused by differences between the simulation model and the production model.The reasons for the errors are given.Establish a preliminary method for analyzing the performance of transducers and a manufacturing process,which can provide accurate performance predictions for the research of carbon fiber shell transducer technology.