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偶极子声波测井换能器阻抗匹配优化设计

Optimal design of impedance matching for dipole acoustic transducer

  • 摘要: 偶极子发射换能器是远探测声波测井仪器的核心部件,其辐射声波的能量及工作带宽直接影响着测井数据的质量。为了优化换能器阻抗匹配,文章将换能器机电等效模型与宽带阻抗匹配网络相结合,基于自适应高斯牛顿算法对网络元件参数进行计算,该方法能够充分考虑换能器的材料及结构参数,且收敛速度快。在消声水池中对阻抗匹配后的换能器进行测试,观测换能器端的有功功率、激励电压、水平指向性、水听器接收电压,综合评估阻抗匹配网络的效果。实验结果表明,所设计的宽带阻抗匹配网络能够明显改善换能器声波辐射性能,使其频带宽度拓宽至原来的3倍,有功功率提高至原来的2.7倍。

     

    Abstract: The dipole emitter transducer is the core component of the remote acoustic logging instrument. The energy and working bandwidth of the sound wave radiated by the transducer directly affect the quality of the logging data. In order to optimize the impendence matching of the trancducer, in this paper, the mechanical and electrical equivalent model of the transducer is combined with the broadband impedance matching network, and the network component parameters are calculated based on the adaptive Gauss-Newton algorithm, which can fully consider the material and structure parameters of the transducer and achieve rapid convergence. Finally, the matched trancducer is tested in the anechoic pool, where the active power, excitation voltage, horizontal directivity, and hydrophone receiving voltage are observed simultaneously. The effect of the impedance matching network is comprehensively evaluated. The experimental results show that the broadband impedance matching network designed in this paper can significantly improve the acoustic radiation performance of the transducer, broaden the bandwidth by 3 times, and increase the active power by 2.7 times.

     

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