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Experimental testing of pre-stressed granular assemblies as a surrogate material for the dynamic analysis of launcher cryogenic tanks

机译：预应力粒状组件作为替代材料的实验测试，用于发射器低温储罐的动态分析

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This paper focuses on the experimental validation of a new methodology for substitution of Liquid Hydrogen (LH2) on a simplified model of launcher cryogenic tank in vibration analysis by using pre-stressed grains as surrogate materials. The objective of the experiments presented here is to analyze the modal behavior of the (Tank and Granular materials) system during pre-stress procedure. In these experimental tests, a cylindrical tank is fully filled with granular materials and vibrated under swept sine and random excitations. Then, the natural frequency of each vibration mode is measured at different levels of pre-stress. The results obtained from the tests show the evolution of each flexural mode as a function of applied pre- stress. Nonlinear behavior of the analyzed system during vibration was also observed. These experimental values carried out with Tank-Granular material system (TGM) are compared with numerical and analytical results to prove the potential of the new methodology. Finally, based on obtained experimental results, some solutions are proposed in order to improve the new methodology for vibration analysis of cryogenic tank which is an important thematic in aerospace engineering.
机译：本文着重于在以预应力晶粒作为替代材料进行振动分析的简化的发射器低温储罐简化模型上对液态氢（LH2）替代新方法进行实验验证。这里提出的实验的目的是分析预应力过程中（坦克和颗粒材料）系统的模态行为。在这些实验测试中，圆柱形储罐中充满了颗粒状物质，并在正弦和随机激励下振动。然后，在不同的预应力水平下测量每种振动模式的固有频率。从测试中获得的结果表明，每种弯曲模式随所施加的预应力的变化。还观察到被分析系统在振动过程中的非线性行为。使用Tank-Granular材料系统（TGM）进行的这些实验值与数值和分析结果进行了比较，以证明这种新方法的潜力。最后，根据获得的实验结果，提出了一些解决方案，以改进低温罐振动分析的新方法，该方法是航空航天工程中的重要主题。

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