| China is a large maritime country.Effective underwater navigation means are needed to protect China’s maritime rights and interests and deal with external challenges.The underwater acoustic navigation system has a wide range of functions and high reliability.However,during the operation period,the underwater beacon needs to sound continuously for a long time,resulting in the rapid loss of its internal power supply,and its energy needs to be supplemented regularly,resulting in the need for frequent offshore operations,which is more difficult to implement.To solve these problems,this paper proposes a method of collecting acoustic energy in water in order to overcome the difficulty of energy supply of existing underwater navigation systems.Therefore,this paper has done the following research:Firstly,the structure diagram of the method is given,and the implementation process is described.Based on the principle of acoustic electric conversion,the method of realizing the piezoelectric energy converter in the structure is obtained,and its components are designed.Through comparison and simulation analysis,a structure with the highest energy output is obtained.Secondly,in order to further improve the effect of sound pressure,a helmholtz resonator is introduced,and a set of better dimension parameters are obtained according to its basic principle and modeling and simulation results.According to the energy output form of the energy converter,an appropriate circuit structure is designed to realize the energy collection,and the best energy collection circuit structure is obtained through modeling and simulation analysis.Finally,based on the simulation results and design parameters,the component of the piezoelectric energy converter in the method is designed.According to the simulation results,an appropriate Helmholtz resonator is made and a variety of piezoelectric ceramics are used to test.After several tests,the best results are obtained.After analysis and comparison,it is concluded that the PZT5 H piezoelectric ceramics with single and double coatings of30mm×40mm and double coatings of 50mm×50mm can produce an average output voltage of200 m V under excitation of acoustic waves at different frequencies.By applying excitation signals of different sound source levels,the maximum output voltage of 30mm×40mm singlecoated piezoelectric ceramic is 2.69 V when the signal is 400 Hz and 186 d B.The energy collector is used to collect and store the energy,and the maximum output power is about 315 n W,which proves that the method is feasible. |
