双蜂窝芯夹层板的隔声特性分析与实验研究

发布时间：2018-07-05 17:00

本文选题：双蜂窝芯夹层板 + 固有频率　；参考：《南昌航空大学》2017年硕士论文

【摘要】：蜂窝芯夹层板质量轻,比强度和比刚度高,具有很好的稳定性和隔声性能,被广泛应用于航空、航天等众多领域,成为飞机和汽车等交通工具重要的组成部分。随着人们对噪声水平的要求越来越严苛,乘用空间的噪声问题逐渐被重视。研究蜂窝板的振动和隔声性能对提高乘坐舒适性降低乘用空间的噪声水平具有重要意义。本文对双蜂窝芯夹层板的振动特性和隔声特性进行理论分析和实验研究,在此基础上对双蜂窝芯夹层板进行了多目标优化。首先,建立双蜂窝芯夹层板固有频率的理论模型,研究结构参数对固有频率的影响。根据Hoff假设,引用正交各向异性多夹芯层板理论,分别建立单蜂窝芯和双蜂窝芯夹层板的振动控制方程并求解得到其固有频率,对比分析了单、双蜂窝芯夹层板的固有频率和模态振型,进而研究了双蜂窝芯夹层板结构参数对其固有频率的影响。结果显示:面板厚度、芯层厚度和面板杨氏模量对固有频率影响较大。其次,建立双蜂窝芯夹层板传声损失的理论模型,研究结构参数对传声损失的影响。以有限尺寸的矩形双蜂窝芯夹层板为研究对象,考虑入射声为混响声场,建立了四边简支边界条件下的传声损失理论模型,通过数值计算对比分析了单、双层蜂窝芯夹层板的传声损失,进而研究了双蜂窝芯夹层板结构参数对隔声量的影响。结果显示:面板厚度、面板密度、芯层厚度和芯层密度对传声损失影响较大。然后,利用阻抗管法测量蜂窝板的传声损失,对比分析了单、双蜂窝芯夹层板的传声损失,并通过测量不同规格的蜂窝板样品研究了蜂窝芯厚度和蜂房边长对隔声量的影响。结果显示:在低频区,增加芯层厚度明显提高蜂窝板的隔声性能,单蜂窝芯蜂房边长越小隔声性能越好。最后利用遗传算法,在蜂窝板总厚度不变的情况下,以蜂窝板的芯层厚度、芯层等效密度和面板密度作为设计变量,先以双蜂窝芯夹层板的隔声量、面密度为目标函数进行刚度约束下的双目标优化,再以双蜂窝芯夹层板的隔声量、面密度和弯曲最大位移为目标函数进行三目标优化,分别得到了Pareto最优解。
[Abstract]:Honeycomb sandwich plate with light weight, high specific strength and specific stiffness, with good stability and sound insulation, has been widely used in aviation, aerospace and many other fields, and has become an important part of aircraft and automobile. As the demand for noise level becomes more and more stringent, the noise problem of passenger space is paid more and more attention. It is important to study the vibration and sound insulation of honeycomb plate to improve ride comfort and reduce the noise level of ride space. In this paper, the vibration and sound insulation characteristics of double honeycomb sandwich plate are theoretically analyzed and experimentally studied, and the multi-objective optimization of double honeycomb sandwich plate is carried out. Firstly, the theoretical model of the natural frequency of double honeycomb sandwich plate is established, and the influence of structural parameters on the natural frequency is studied. Based on the Hoff hypothesis, the vibration control equations of single honeycomb sandwich plate and double honeycomb sandwich plate are established by using the theory of orthotropic multi-sandwich laminates, and the natural frequencies are obtained. The influence of structural parameters on the natural frequency of double honeycomb sandwich plate is studied. The results show that the thickness of the panel, the thickness of the core layer and the Young's modulus of the panel have great influence on the natural frequency. Secondly, the theoretical model of sound transmission loss of double honeycomb sandwich plate is established, and the influence of structural parameters on sound transmission loss is studied. Taking the rectangular double honeycomb sandwich plate with finite size as the research object and considering the incident sound as reverberation field, a theoretical model of sound transmission loss under the condition of simply supported boundary on four sides is established. The sound transmission loss of double honeycomb sandwich plate is studied, and the influence of the structure parameters of double honeycomb sandwich plate on the sound insulation is studied. The results show that the thickness of the panel, the density of the panel, the thickness of the core layer and the density of the core layer have great influence on the sound transmission loss. Then, the acoustic loss of honeycomb plate was measured by impedance tube method, and the sound transmission loss of single and double honeycomb sandwich plates was compared and analyzed. The effects of honeycomb core thickness and beehive side length on the sound insulation were studied by measuring the honeycomb plate samples of different specifications. The results show that in the low frequency region, the sound insulation performance of the honeycomb plate is obviously improved by increasing the thickness of the core layer. The smaller the side length of the honeycomb is, the better the sound insulation performance of the honeycomb is. Finally, using genetic algorithm, when the total thickness of honeycomb plate is constant, the thickness of core layer, equivalent density of core layer and panel density of honeycomb plate are taken as design variables, and the sound insulation of sandwich plate with double honeycomb core is first used. The surface density is taken as the objective function for the optimization of the stiffness constraint. The Pareto optimal solution is obtained by using the sound insulation, the surface density and the maximum bending displacement of the double honeycomb sandwich plate as the objective functions.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB383.4

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