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目前压电分流阻尼技术在振动和噪声领域的应用得到了广泛的关注.本文尝试将压电分流阻尼技术应用于水下吸声领域,以提高覆盖层的吸声性能.将压电覆盖层厚度模态的机电方程和声波传播的传递矩阵相结合,建立一维电声模型.该模型可以用于分析多层压电和非压电水下吸声覆盖层的吸声性能.采用该模型分析了0-3型压电复合材料覆盖层的水下吸声性能.压电复合材料的参数是采用Fumkawa的模型计算的.研究结果表明,采用合适的分流电阻,负电容分流电路可以在较宽的频率范围显著提高覆盖层的吸声性能.其原理可以从阻抗匹配的角度解释.负电容分流电路可以调整压电覆盖层的表面声阻抗,使之与水的特性声阻抗相匹配.
Piezoelectric shunt damping technology has been widely used in vibration and noise fields.This paper attempts to apply the piezoelectric shunt damping technology to underwater sound absorption to improve the sound absorption performance of the coating.The piezoelectric coating thickness Modal electromechanical equations and the propagation matrix of acoustic wave propagation, a one-dimensional electro-acoustic model is established, which can be used to analyze the sound absorption performance of multi-layer piezoelectric and non-piezoelectric submerged sound absorbing coatings. Using this model analysis The underwater acoustic performance of the 0-3 piezoelectric composite coating is calculated.The parameters of the piezoelectric composite are calculated by the Fumkawa model.The results show that with a suitable shunt resistor, Of the frequency range significantly improve the sound absorption performance of the cover.The principle can be explained from the perspective of impedance matching.The negative capacitance shunt circuit can adjust the surface acoustic impedance of the piezoelectric coating to match the characteristic acoustic impedance of water.