Structural Analysis of a Scientific Balloon Using Assumed Strain Formulation Solid Shell Finite Elements

Lee, Keejoo; Lee, Sung

doi:10.2514/6.2005-1802

Cited by 2 publications

(3 citation statements)

References 7 publications

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“…N 1 monotonically decreases and then increases with increasing of the coordinate of x-axis, at the apex and the nadir the balloon has singular points where meridional tension becomes infinite), whereas the distribution of circumferential tension N 2 follows a overhead parabolic curve (or N 2 monotonically increases and then decreases with increasing of the coordinate of xaxis). This is reasonably consistent with the calculations of Lee and Lee 18. Thus it is argued that new model and analytical solution have adequately and logically characterized physical characteristics and phenomenological quantitative laws.…”

supporting

confidence: 88%

“…The calculation obtained by new model is reasonably consistent with the calculations of Lee and Lee. 18 Thus it is argued that new model and analytical solution have adequately and logically characterized physical characteristics and phenomenological quantitative laws. Importantly, the parameters of this model can be estimated expediently and easily.…”

Section: Fundingmentioning

confidence: 99%

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Practical analytical model to predict high-altitude balloon shape and film tension

Xiong

Yun

Cheng

2012

Proceedings of the Institution of Mechanical Engineers, Part G:

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This article seeks to outline novel simplified model and analytical solution for predicting geometrical shape and film tension of high-altitude balloon. Sphero-conical and ellipsoid-conical models were proposed to depict geometrical configuration of high-altitude balloon subjected to a payload. By considering the effect of atmospheric factors and lifting gas temperature on geometrical shape of balloon, geometrical parameters of equilibrium shape were solved, based on minimum potential energy principle satisfying material constraint. New analytical solution was derived to allow balloon film tensions in meridional and circumferential directions. Finally, new model and its solution were used for predicting geometrical shape and film tension of natural-shape balloon on the ground and on float in stratosphere respectively, demonstrating the practical and effective use of the proposed model.

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supporting

confidence: 88%

Section: Fundingmentioning

confidence: 99%

Practical analytical model to predict high-altitude balloon shape and film tension

Xiong

Yun

Cheng

2012

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

show abstract

“…For implementation into the finite difference scheme, equation 25 will be rewritten, (27) and with the addition of a static pressure difference, the ∆P term in equations 3 and 4 is…”

Section: Aerodynamic Modelingmentioning

confidence: 99%

An Aeroelastic Analysis of a Thin Flexible Membrane

Scott

Bartels

Kandil

2007

48th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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Studies have shown that significant vehicle mass and cost savings are possible with the use of ballutes for aero-capture. Through NASA's In-Space Propulsion program, a preliminary examination of ballute sensitivity to geometry and Reynolds number was conducted, and a single-pass coupling between an aero code and a finite element solver was used to assess the static aeroelastic effects. There remain, however, a variety of open questions regarding the dynamic aeroelastic stability of membrane structures for aero-capture, with the primary challenge being the prediction of the membrane flutter onset. The purpose of this paper is to describe and begin addressing these issues. The paper includes a review of the literature associated with the structural analysis of membranes and membrane flutter. Flow/structure analysis coupling and hypersonic flow solver options are also discussed. An approach is proposed for tackling this problem that starts with a relatively simple geometry and develops and evaluates analysis methods and procedures. This preliminary study considers a computationally manageable 2-dimensional problem. The membrane structural models used in the paper include a nonlinear finite-difference model for static and dynamic analysis and a NASTRAN finite element membrane model for nonlinear static and linear normal modes analysis. Both structural models are coupled with a structured compressible flow solver for static aeroelastic analysis. For dynamic aeroelastic analyses, the NASTRAN normal modes are used in the structured compressible flow solver and 3rd order piston theories were used with the finite difference membrane model to simulate flutter onset. Results from the various static and dynamic aeroelastic analyses are compared.

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Structural Analysis of a Scientific Balloon Using Assumed Strain Formulation Solid Shell Finite Elements

Cited by 2 publications

References 7 publications

Practical analytical model to predict high-altitude balloon shape and film tension

Practical analytical model to predict high-altitude balloon shape and film tension

An Aeroelastic Analysis of a Thin Flexible Membrane

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