【摘要】 为了降低水介质管路系统的低频噪声以及更加准确地预测水介质消声器传递损失，设计一种水介质复合消声器，使用结构声耦合数值模型分析消声器的声学特性。计算壁厚为150 mm的穿孔管消声器传递损失，并与刚性条件下的数值结果进行比较，验证方法的正确性；研究弹性腔壁与水介质的耦合作用以及不同结构参数的穿孔管和内插管对消声器传递损失的影响。数值研究表明：复合消声器的消声效果相较于传统的穿孔管消声器有较大提升；降低腔壁材料的弹性模量会使结构声耦合效应增强，低频消声性能得到提高；增加腔壁材料的阻尼系数，通过频率处的消声效果得到提高；减小腔壁壁厚有利于低频消声效果的提高，但不利于宽频范围的消声性能；复合消声器内加入内插管后，消声效果在较大频率范围内得到提升；改变穿孔管的结构参数，对低频消声效果影响不大。更多还原

【Abstract】 In order to reduce the low-frequency noise of the water-medium pipeline system and predict the transmission loss of the water-medium muffler more accurately, a composite water-medium muffler was designed, and the acoustic characteristics of the muffler were analyzed using the structure-acoustic coupling numerical model. The transmission loss of the perforated pipe muffler with a wall thickness of 150 mm was calculated and compared with the numerical results under rigid conditions to verify the correctness of the method; the coupling effect of the elastic cavity wall and the water medium,and the perforated pipe and inner pipe with different structural parameters were studied. The effect of intubation on the transmission loss of the muffler. Numerical research shows that the muffler effect of the composite muffler is greatly improved compared with the traditional perforated pipe muffler; reducing the elastic modulus of the cavity wall material will enhance the structural sound coupling effect and improve the low-frequency muffler performance, increasing the cavity wall The damping coefficient of the material is improved by the noise reduction effect at the frequency, reducing the wall thickness of the cavity is conducive to the improvement of the low frequency noise reduction effect, but is not conducive to the noise reduction performance of the wide frequency range. The sound effect is improved in a larger frequency range, changing the structural parameters of the perforated pipe has little effect on the low frequency noise reduction effect.更多还原