Hydro-Elastic Tank Modeling
Liquid Propulsion

Hydro-elastic modes are relevant to the prediction of the structural modes of launch vehicles that carry liquid propellant in flexible containers. These same structural modes are then used in support of a variety of dynamic analyses, including the pogo stability analysis, and must take into account various liquid fill levels that will be experienced during flight. SwRI engineers have performed dynamic analyses using 2D and 3D finite element models for a variety of configurations, including comparison to modal test data for analytical validation. The experimental data were obtained from an SwRI-designed sub-scale test article subjected to impact hammer modal tests while monitoring structural and fluid responses.

image of 3D model of a sub-scale test article

SwRI engineers developed a 3D model of a sub-scale test article for completion of a combined experimental/ analytical program to quantify hydro-elastic influence on structural dynamics.

image of a 3D hydro-elastic modal analysis result

A 3D hydro-elastic modal analysis result demonstrating a typical shell mode.

Related Terminology

hydro-elastic tank modeling  •  liquid propulsion experience  •  launch vehicle systems development  •  propulsion systems development  •  structural dynamics  •  fluid dynamics  •  fluid-structure interaction  •  Pogo  •  launch vehicle structural dynamics  •  propulsion system fluid dynamics  •  hydro-elastic tank modeling  •  prototype development  •  prototype testing

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Southwest Research Institute® (SwRI®), headquartered in San Antonio, Texas, is a multidisciplinary, independent, nonprofit, applied engineering and physical sciences research and development organization with 10 technical divisions.