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Consistency linear array of piezoelectric transducer performance for the overall acoustic performance of the linear array merits great influence, in the conventional line array structures described herein based on the lineup, improved for its inherent disadvantages. By comparing the changes of the parameters such as the admittance and sensitivity of the piezoelectric transducer before and after the improvement of the array structure, it can be seen that the change of the array structure improves the consistency of the electroacoustic characteristics of the piezoelectric transducer. Structural improvement methods and experimental results have reference value for future line array design. Introduction A narrow array of beams can be formed by using a linear array of acoustic transducers arranged in a straight line. Therefore, it is widely used in various underwater equipment and carriers. In the process of online array fabrication and assembly, the consistency of performance of each array element transducer has a great influence on the acoustic characteristics of the entire array. At present, most of the acoustic transducers use piezoelectric ceramic materials. Since the piezoelectric crystal is an anisotropic material, the fabrication process is complicated. Therefore, even if the same batch of piezoelectric ceramic wafers fabricated in the same working environment have their own electrical parameters, there are large differences [1]. This property leads to large differences in the electrical parameters of the fabricated array transducers. Of course, this difference due to sensitive components can be effectively reduced or even eliminated by screening. Another factor that can significantly affect the performance consistency of the array transducer is the layout structure. In this paper, the influence of the traditional array structure on the resonant frequency of the piezoelectric transducer and the admittance and other electrical parameters is theoretically analyzed from the definition of the electrical parameters of the transducer, and the optimal design method is given. By carrying out experimental analysis and comparing the experimental results, it is obvious that the change of the array structure affects the electrical performance and acoustic performance of the piezoelectric transducer [2]. Equivalent Circuit of Piezoelectric Transducer Figure 1. Piezoelectric transducer lumped parameter equivalent electromechanical diagram. Through the electromechanical analogy method, the piezoelectric transducer can be compared to an electrical load, and the electroacoustic characteristic parameters of the transducer can be analyzed and solved by electrical problems [3]. As a piezoelectric transducer that vibrates in a single mode and 449 operates near the resonant frequency, the lumped parameter equivalent electromechanical diagram is shown in Fig. 1. In the above figure, 0 R is the resistance loss; 0 C is the static capacitance; n is the electromechanical conversion coefficient; ' 1 M is the mechanical vibration equivalent mass; ' 1 C is the equivalent flexibility; ' 1 R is the mechanical resistance; D is the diffraction constant, f P is the free field sound pressure; A is the effective emission or receiving area. The impedance of a piezoelectric transducer consists of three parts, including: Static electrical impedance: 0 0 0 1/ (1/ ) Z R j C ω = + ; Mechanical impedance: ' ' ' 1 1 1 ( 1/ ) m Z R j M C ω ω = + − ; Load impedance: s s s Z R j M ω = + . The impedance of piezoelectric transducer and the load impedance are reflected into the circuit through electromechanical coupling. The equivalent impedance is shown in Fig. 2 below. Figure 2. The equivalent circuit of a lossless piezoelectric transducer. In this figure, ' 2 1 1 ( ) / s R R R n = + ; ' 2 1 1 C C n = i ; ' 2 1 1 ( ) / s L M M n = + . Therefore, the total electrical admittanceY of the equivalent circuit of the piezoelectric transducer can be obtained as: 1 1 1 0 2 2 2 2 1 1 1 1 1 1 ( 1 / ) [ ] ( 1 / ) ( 1 / ) R L C Y j C R L C R L C ω ω ω ω ω ω ω − = + − + − + − (1) Structural Design of Line Array Layout Line arrays must consider a variety of factors when designing a layout structure, and make reasonable improvements based on different types of array element transducers. For narrow-band line arrays, particular attention should be paid to the effect of the array structure on the operating frequency of the array element transducer. In order to isolate the vibration transmission from the base frame to the transducer, the conventional line array structure generally adopts the structure shown in Fig. 3 below, and the physical map is as shown in Fig. 4 below. Figure 3. Schematic diagram of traditional linear array structure.

Analysis and Experimental Research on Influence of Array Structure of Linear Array on Electroacoustic Characteristics of Transducer