摘要
从应用角度对小目标壳体进行了高频近似,利用声传播理论和粘弹性理论推导了敷设薄吸声层多层结构的声场特性。提出用敷设多层粘弹性材料代替敷设单层吸声层,以实现吸声层的阻抗渐变。计算敷设多层薄吸声层结构的高频回声特性,并分析了吸声层阻抗渐变存在的规律及其对吸声性能的影响,给出了改善其吸声性能的方法。分析结果表明:吸声层总厚度相同时,具有合适阻抗配比的阻抗渐变结构能够改善吸声模型性能。最后,通过对敷设某型聚脲和橡胶材料多层结构的仿真,验证了结论的正确性。
The small immerged target is approximately treated as multi -layer plates in the field of application. Then the la- conic calculating formulae of arbitrary multiple - layer model＇ s acoustic characteristics are introduced with sound transmission theoretics. In order to improve the model sound absorption performance, multilayer viscoelastic materials model replacing single - layer absorption model is advanced and its high - frequency echoes characteristics are provided. The relationship be- tween gradually changed impedance of multilayer absorption and mode performance is discussed. On the basis above, the meth- od of improving model performance is analyzed. The results show that the gradual change impedance structure with proper imped- ance ratio can ameliorate absorption model. The simulative using rubber and Spray Poiyurea Elastomer validate the correctness.
出处
《电声技术》
2012年第5期78-81,共4页
Audio Engineering
基金
国家部委基金资助项目(201030101)
关键词
声场特性
粘弹性材料
阻抗渐变
高频
acoustic characteristics
viscoelastic materials
graded impedance
high frequency
