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首页> 外文期刊>Journal of Engineering Mechanics >Finite Element Design and Modal Analysis of a Hexakis Icosahedron Frame for Use in a Vacuum Lighter-Than-Air Vehicle
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Finite Element Design and Modal Analysis of a Hexakis Icosahedron Frame for Use in a Vacuum Lighter-Than-Air Vehicle

机译：用于真空较轻的空气车辆的六思拟伊索拉面板架的有限元设计及模态分析

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This research discusses the design, modal analysis, and additive manufacturing of a hexakis icosahedron frame for use in a vacuum lighter-than-air vehicle (VLTAV). A frame in the shape of a hexakis icosahedron, when encased by a thin membrane-like skin, would be able to withstand the pressure load induced by internal air evacuation and produce positive buoyancy. For a better appreciation of the force resistance within the hexakis frame, a manufactured frame was constructed. The actual frame has many varying oriented beams, making its construction complicated for standard production methods. Therefore, additive manufacturing was incorporated. A portion of this paper is directed toward the description of the method carried out. A 0.1778-m-diameter hexakis icosahedron frame was additively manufactured using VeroWhitePlus plastic. A modal experiment using a laser vibrometer was performed in order to determine the eigenvalues of the structure for comparison to the modal analysis results of a finite element (FE) model of the frame assuming a free-free boundary condition. This comparison allowed for the verification of the equivalent modulus of elasticity used in an analysis and the overall construction of the model. The finite element model predicted the first two frequency modes within 1% of the experimental results. Because the FE model accurately predicted the dynamic properties of the frame, the modeling technique in which the assumed member connections were verified led to confidence for future modeling. (C) 2018 American Society of Civil Engineers.
机译：本研究讨论了用于真空较轻比空气（VLTAV）的六面型二氧化碳纤维架的设计，模态分析和添加剂制造。当被薄膜状皮肤包封时，六氧化二元素的形状的框架将能够承受内部空气抽空引起的压力载荷并产生正浮力。为了更好地欣赏六框架内的力阻力，构造了制造的框架。实际框架具有许多不同的面向梁，使其构造适用于标准生产方法。因此，掺入了添加剂制造。本文的一部分涉及对所进行的方法的描述。使用VerowhitePlus塑料造成0.1778-m直径的六面型甲板框架。使用激光振动计的模态实验是为了确定结构的特征值，以便与假设无自由边界条件的框架的有限元（Fe）模型的模态分析结果进行比较。这种比较允许验证分析中使用的等效弹性模量和模型的整体构造。有限元模型预测了在实验结果的1％内的前两个频率模式。因为FE模型准确地预测了框架的动态特性，所以验证假定的成员连接的建模技术导致了未来建模的信心。 （c）2018年美国土木工程师协会。

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