Design And Implementation Of Small And Low Frequency High Power Underwater Acoustic Emission Transducer

Small low frequency high power underwater acoustic emission transducer(hereinafter referred to as the transmitting transducer) is a kind of flextensional transducer, its characteristic is: the longitudinal vibration transducer with high power capacity and type V flextensional transducer has the advantages of compact structure, and a new type flextensional transducer with small size, low frequency cymbal.The finite element method has been widely used in the design and optimization of the structure, at the same time, the rapid development of computer technology, the finite element method has become an effective numerical method. The finite element method is used in this design, break through the restrictions of previous equivalent circuit method is used to design the transducer. Using ANSYS finite element software is simple, convenient and finite element analysis of the design of the transmitting transducer.The establishment of the transmitting transducer 1/8 three-dimensional finite element model by using ANSYS software, and the finite element model of the modal analysis in the air, studied the effect of size on the resonant frequency of the transducer. Research and analysis shows that, we can improve the model through the modal analysis, the resonance frequency of the transducer to reduce and improve other properties. In order to further understand the influence of transducer parameters on the resonant frequency, the orthogonal experimental design. At the same time, the emission transducer size can be accepted and hydrostatic resistance ability, according to the analysis of the orthogonal experimental data, choose one optimal parameters for subsequent design.Response analysis of design of air and water on the transmitting transducer 1/8 three-dimensional finite element model using acoustic analysis function of ANSYS software of harmonic. Through the ANSYS software after data processing conditions the response analysis module to extract harmonic, electric admittance curve of transducer in air and in water, the transmitting voltage response curve of class. At the same time, the assembly process of transmitting transducer, expounds the design process and testing process of the acoustic properties of the acoustic data, obtained with the. And the simulation data and the measured data are compared, there are some differences between the two, which is mainly composed of weight and O flange and bolt seal reduces the efficiency of vibration transmission. Analysis results show that the radiation properties of the transducer is better.The design of the transmitting transducer simulation data as follows: the water send voltage response of the resonant frequency 590 Hz level is 130 d B,-3d B bandwidth was 120 Hz, its maximum source level is not less than 186 d B, the sound power of the transmitting transducer radiation is about 100 W, is belong to the category of low frequency high power. Measured data transmitting transducer prototype is:the resonance frequency is 460 Hz, sending voltage response level of 118.8d B,-3d B bandwidth was 140 Hz.Research on the broadband transducer significance, discusses several commonly used methods of frequency transducer. A double excitation method and the matching layer two to broaden the transmitting transducer finite element model using the ANSYS software, and the finite element model for air and fluid.