Viscoelastic material acoustic coating plays an important role in noise and vibration control of underwater equipment. The dynamic mechanical properties of the viscoelastic material have a direct effect on the sound absorption performance of the acoustic coating. The influence of Poisson’s ratio on sound absorption performance is studied. A finite element model was established to calculate the sound absorption performance of three typical acoustic coatings: homogeneous acoustic coatings, Alberich acoustic coatings, and trumpet cavity acoustic coatings, and the influence of Poisson’s ratio on the sound absorption performance of the three kinds of acoustic coatings was analyzed. The results show that when Poisson’s ratio varies from 0.49 to 0.4999, the larger Poisson’s ratio is, the larger the frequency of the first absorption peak is, the smaller the absorption coefficient below the frequency of the first absorption peak is, and the smaller the average absorption coefficient in the whole analysis frequency range is. The dynamic Poisson’s ratio with the change of frequency is obtained by interpolating the test results and static Poisson’s ratio finite element calculation results. The calculation results show that the dynamic Poisson’s ratio can get more accurate calculation results. This work can provide a reference for researchers to set Poisson’s ratio in theoretical analysis and finite element analysis of acoustic coating.

中文翻译：

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考虑不同泊松比值的水下吸声涂层吸声性能分析

粘弹性材料声学涂层在水下设备的噪声和振动控制中起着重要作用。粘弹性材料的动态力学性能直接影响吸声涂层的吸声性能。研究了泊松比对吸声性能的影响。建立了有限元模型，计算了均质吸声涂层、Alberich吸声涂层和喇叭腔吸声涂层三种典型吸声涂层的吸声性能，以及泊松比对三种吸声涂层吸声性能的影响进行了分析。结果表明，当泊松比在 0.49 到 0.4999 之间变化时，泊松比越大，第一个吸收峰的频率越大，第一吸收峰频率以下的吸收系数越小，整个分析频率范围内的平均吸收系数越小。通过对试验结果和静态泊松比有限元计算结果进行插值，得到随频率变化的动态泊松比。计算结果表明，动态泊松比可以得到更准确的计算结果。该工作可为研究人员在声学涂层的理论分析和有限元分析中设置泊松比提供参考。通过对试验结果和静态泊松比有限元计算结果进行插值，得到随频率变化的动态泊松比。计算结果表明，动态泊松比可以得到更准确的计算结果。该工作可为研究人员在声学涂层的理论分析和有限元分析中设置泊松比提供参考。通过对试验结果和静态泊松比有限元计算结果进行插值，得到随频率变化的动态泊松比。计算结果表明，动态泊松比可以得到更准确的计算结果。该工作可为研究人员在声学涂层的理论分析和有限元分析中设置泊松比提供参考。