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首页> 外文会议>2017 Fifth International Conference on Aerospace Science amp; Engineering >Vibration analysis of viscoelastic composite panels of engine cowling in propeller aircraft using analytical numerical methods
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Vibration analysis of viscoelastic composite panels of engine cowling in propeller aircraft using analytical numerical methods

机译：螺旋桨飞机发动机整流罩粘弹性复合材料板的振动分析和数值分析

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In this work the vibration analysis of viscoelastic composite panels of engine in propeller aircraft has been carried out. Both analytical and numerical (Finite Element) analysis has been carried out. Engine Panels are similar to plates. So, analytical formulation of the plate has been carried out to find out the vibrational response for specially orthotropic composite panel. As the solution of equilibrium equations for general laminates with any stacking sequence cannot be obtained analytically. Therefore, numerical method technique (Finite Element Analysis) is then employed to find out the vibrational characteristics of the panel. By carrying out modal analysis it is found out that the natural frequencies of the composite panel became higher by the inclusion of viscoelastic layers. So, increase in the natural frequencies will be advantageous in engine cowling panels. It is also observed that for panels with and without viscoelastic laminas, the deflection patterns are quite similar. However, as the natural frequencies of the panel without viscous effects are lower, so therefore deflection of the central node occurred earlier. Furthermore, a very small decrease in the transverse deflection of the node is seen for viscoelastic panel. A phase shift is also observed. Transient analysis revealed that all composite panels exhibit damping characteristics to an impulse force. However, damping effect is prominent in panels with viscoelastic laminas.
机译：在这项工作中，进行了螺旋桨飞机发动机粘弹性复合板的振动分析。分析和数值（有限元）分析均已进行。引擎面板类似于板。因此，已经对板进行了解析公式化，以找出特殊正交异性复合板的振动响应。由于无法通过解析获得具有任何堆叠顺序的一般层压板的平衡方程组。因此，然后采用数值方法技术（有限元分析）来找出面板的振动特性。通过进行模态分析，发现通过包含粘弹性层，复合板的固有频率变得更高。因此，固有频率的增加在发动机整流罩面板中将是有利的。还观察到，对于具有和不具有粘弹性薄片的面板，挠曲模式非常相似。但是，由于没有粘性作用的面板的固有频率较低，因此中心节点的挠曲较早发生。此外，对于粘弹性板，节点的横向挠度减小很小。还观察到相移。瞬态分析表明，所有复合板都表现出对冲力的阻尼特性。然而，在具有粘弹性薄层的面板中阻尼作用是显着的。

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