Research And Simulation Verification On The Design Method Of Single Frequency Resonant High Precision Underwater Sound Source

Underwater sound is a widely used means of information transmission in the ocean.In recent years,the underwater acoustic system has become more and more complex and diversified.The single-frequency sound source used for underwater acoustic navigation and positioning and ranging laterally is widely used in underwater acoustic systems.In the construction of ocean wide area system,there is an urgent need for a standard single-frequency sound source to be permanently deployed in the sea.The core engineering problem is how to supply energy for the sound source,the key technology is low power consumption design and improve the efficiency of electroacoustic conversion.In this paper,the electro-acoustic conversion efficiency of high-precision resonant single-frequency sound source is studied,focusing on the problem of coupling efficiency of high-precision single-frequency sound source and the relationship between resonance and coupling efficiency.The main contents of this paper are as follows:1.It is an effective method to improve the energy conversion efficiency of sound source by using resonance principle in engineering.But in the design of solid-liquid coupling underwater acoustic device,the resonance principle can not be directly applied to solve the specific coupling problem.In the second chapter,the classical vibration mechanics model and circuit equivalent theory are used to analyze the characteristics of the resonator.The relationship among energy input,consumption and output is studied from the perspective of energy,and the theoretical model of energy coupling is established.Based on this model,the coupling relationship between the isolated closed resonant system and the external environment can be studied and analyzed,so as to calculate the coupling efficiency.2.In the third chapter,the sound efficiency of the diaphragm is studied.Based on the principle of diaphragm resonance,the energy input from the magnetic exciter to the resonant diaphragm is coupled to the water area to produce radiated sound energy.Firstly,the resonance phenomenon and basic characteristics of the diaphragm are studied and verified by a simulation platform.The influence of the diaphragm parameters on the first order natural frequency of the resonator is derived using the classical mechanics theory.Then the energy equation of the resonant state is established by using the circuit equivalent method,which simplifies the analysis method of the resonant coupling efficiency of the diaphragm,and it is verified by simulation.3.As a single frequency standard underwater sound source,it has a high requirement for the accuracy of sound waves.The fourth chapter of this paper focuses on how to realize a high-Q high-energy vibrating body.The theory and simulation of vibrating string and tuning fork resonators are studied in detail.This chapter focuses on the analysis of the tuning fork as a high Q value high energy vibration sound body and the simulation verification.4.Based on the above theoretical model and combined with the practical requirements of Marine engineering,a high-precision single frequency sound source structure is designed in Chapter 5.The correctness of the theoretical model is verified by simulation,which provides theoretical guidance for further optimizing the performance of the sound source.