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针对黏弹性材料吸声效率问题,利用分层介质声传播理论和数值算法优化了不同物理条件下材料的复弹性模量。采用参数等效的方法分析了含气泡黏弹性材料的声学特性,并给出了此种材料优化后的弹性模量曲线。根据物理模型计算了一定边界条件下材料复弹性模量等吸声系数曲线,得到了几种背衬条件下黏弹性材料吸声系数大于0.8的弹性模量和损耗因子范围。研究表明调节黏弹性材料的复弹性模量可以有效提高材料的吸声性能,吸声系数大于0.8时其弹性模量和损耗因子范围在不同背衬条件下差异较大,发现一定厚度的钢背衬会降低调控复弹性模量的难度,对含气泡黏弹性材料的计算也可得到类似结果。
According to the sound absorption efficiency of viscoelastic materials, the complex elastic modulus of materials under different physical conditions is optimized by using the theory of layered medium acoustic propagation and the numerical algorithm. The parametric equivalent method was used to analyze the acoustic properties of the bubble-containing viscoelastic material. The optimized elastic modulus curve of the material was also given. According to the physical model, the curve of sound absorption coefficient of complex elastic modulus under certain boundary conditions was calculated, and the elastic modulus and loss factor range of the viscoelastic material with the sound absorption coefficient greater than 0.8 under the condition of backing were obtained. Studies have shown that adjusting the complex elastic modulus of viscoelastic materials can effectively improve the sound absorption performance of the material. When the sound absorption coefficient is greater than 0.8, the elastic modulus and loss factor range are greatly different under different backing conditions. It is found that the thickness of the steel back Lining will reduce the difficulty of regulating the complex elastic modulus, and the calculation of the bubble-containing viscoelastic material will yield similar results.