复材结构刚度与隔声量的计算及参数优化

论文旨在满足结构刚度指标的前提下最大程度地提高复合材料(以下简称“复材”)结构的隔声性能。首先针对复材结构进行刚度分析，在铺层数和铺层比例不变的前提下，分析不同铺层构型对结构刚度的影响。然后利用统计能量分析法，确定铺层角度对结构隔声性能的影响，并与试验结果进行对比验证模型的有效性。最后以铺设在复材壁板上的隔音棉厚度和密度为两个优化参数，分析不同厚度和密度的隔音棉的插入损失，并进行参数最优化分析，寻找最佳组合方式。得出结论：不同铺设角度顺序对复材整体结构的弯曲刚度和吻合效应频率有影响，在相同尺寸和边界条件下，构型1屈曲稳定性承载能力较强，隔声效果最好，铺层方式最优；隔音棉密度对插入损失影响较小，而隔音棉厚度对插入损失影响较大。论文选取的隔音棉密度和厚度已经使壁板、隔音棉及内饰板的组合结构隔声量达到了收敛状态，是最优化的组合设计。

Calculation and parameter optimization of stiffness and transmission loss of the composite structure

This paper aims to improve extremely the sound insulation performance of the composite structure based on satisfying the stiffness requirement. Firstly, the stiffness of different configuration composite structures has been analyzed under the condition that the number and proportion of layers are constant. Then the effect of the layer angle on the sound insulation performance has been calculated by the statistic energy analysis (SEA), and the simulated results are validated by test data. Lastly, the insertion loss (IL) of the thermal and acoustic insulation blanket (TAIB) laying on the composite structures has been evaluated and optimized by two parameters: the thickness and density of TAIB. The results show that: (1) The angle of the layers has efficient effect on the bending stiffness and coincidence frequency of the composite structure; Under the same dimension and boundary condition, the Configuration 1 has the better buckling stability bearing capacity and acoustic insulation performance. (2) Compare to the density of TAIB, its thickness has obviously influence on the IL of the structure. The transmission loss of the composite structure has been convergence with the chosen density and thickness of TAIB.