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Evaluation of complex eigenmodes of stiffened cylindrical shells using analytical and numerical methods

机译:用解析和数值方法评估加筋圆柱壳的本征模

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The evaluation of noise transmission characteristics of aircraft structures requires the set up of appropriate models for both the structure and the related acoustic cavity. A particular attention is devoted here to the study of cylindrical shell structures stiffened by frames and stringers. A discrete model can rely on a finite element approach where conventional (degenerated) shell elements are used for the main structure while beam elements are selected for transversal and longitudinal stiffeners. An alternative is offered by a continuous analytical representation based on Donnell-Mushtari thin shell model where the effect of discrete stiffeners is handled through appropriate updates of kinetic and strain energies. These approaches are evaluated in a modal context (comparison of stiffened eigenmodes) using two different softwares (Actran~1 based on a Finite Element Method (FEM) and Quiet~4 based on an analytical method). The two main outcomes of this study are (1) the relative complexity of mode shapes of ring-stringers cylinders (even for lower order modes) and (2) the capability of both software to capture the related dynamics. This last feature is particularly interesting for the analytical tool since it is obtained at a reduced computational cost and enables further vibro-acoustic applications~4 incorporating fluid-structure interaction effects and complex distributed random excitations (diffuse field or turbulent boundary layer excitations).
机译:飞机结构的噪声传输特性的评估需要为结构和相关的声腔建立适当的模型。此处特别注意研究框架和桁条加固的圆柱壳结构。离散模型可以依靠有限元方法,其中常规(退化)壳单元用于主要结构,而梁单元则用于横向和纵向加劲肋。基于Donnell-Mushtari薄壳模型的连续分析表示法提供了一种替代方法,其中通过适当更新动能和应变能来处理离散加劲肋的影响。这些方法是使用两种不同的软件(基于有限元方法(FEM)的Actran〜1和基于分析方法的Quiet〜4)在模态环境下(增强特征模态的比较)进行评估的。这项研究的两个主要结果是(1)纵梁圆柱体的模式形状的相对复杂性(即使对于低阶模式),以及(2)两种软件捕获相关动力学的能力。最后一个特征对于分析工具特别有趣,因为它以较低的计算成本获得,并且能够实现进一步的振动声学应用,[4]结合了流固耦合效应和复杂的分布式随机激发(扩散场或湍流边界层激发)。

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  • 会议地点 Ottawa(CA);Ottawa(CA)
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    Free Field Technologies S.A. Rue Emile Francqui 1 B1435 Mont Saint Guibert (Belgium) Email address: jean-pierre.coyette@fft.be;

    Free Field Technologies S.A. Rue Emile Francqui 1 B1435 Mont Saint Guibert (Belgium) Email address: gregory.lielens@fft.be;

    Free Field Technologies S.A. Rue Emile Francqui 1 B1435 Mont Saint Guibert (Belgium) Email address: benoit.vandennieuwenhof@fft.be;

    Free Field Technologies S.A. Rue Emile Francqui 1 B1435 Mont Saint Guibert (Belgium) Email address: bernard.vanantwerpen@fft.be;

    Airbus France Acoustics & Environment Department EDEA Route de Bayonne 316 F31060 Toulouse Cedex 09 (France) Email address: pascale.neple@airbus.com;

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