Aerodynamic decelerators - An engineering review

Maydew, R.C.; Pepper, William B.

doi:10.2514/3.44220

Cited by 29 publications

(4 citation statements)

References 40 publications

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“…2018; Schomberg et al. 2018; Tzezana & Breuer 2019), sails (Colgate 1996; Kimball 2009) parachutes (Pepper & Maydew 1971; Stein et al. 2000) and micro-air vehicles (Lian & Shyy 2005).…”

Section: Introductionmentioning

confidence: 99%

“…Being able to predict the onset of membrane instability across parameter space, either by flutter, divergence or a combination of the two, is fundamental to a wide range of applications. Stable membranes can be used in a variety of configurations in aircraft and shape-morphing airfoils (Abdulrahim, Garcia & Lind 2005;Lian & Shyy 2005;Hu, Tamai & Murphy 2008;Stanford et al 2008;Jaworski & Gordnier 2012;Piquee et al 2018;Schomberg et al 2018;Tzezana & Breuer 2019), sails (Colgate 1996;Kimball 2009) parachutes (Pepper & Maydew 1971;Stein et al 2000) and micro-air vehicles (Lian & Shyy 2005). When a rigid wing moves through a flow its upper surface may experience flow separation and significant reductions in aerodynamic efficiency in both steady and unsteady flows, thus limiting the aircraft's manoeuvrability and performance.…”

Section: Introductionmentioning

confidence: 99%

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Membrane flutter in three-dimensional inviscid flow

Mavroyiakoumou

Alben

2022

J. Fluid Mech.

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We develop a model and numerical method to study the large-amplitude flutter of rectangular membranes (of zero bending rigidity) that shed a trailing vortex-sheet wake in a three-dimensional (3-D) inviscid fluid flow. We apply small initial perturbations and track their decay or growth to large-amplitude steady-state motions. For 12 combinations of boundary conditions at the membrane edges we compute the stability thresholds and the subsequent large-amplitude dynamics across the three-parameter space of membrane mass density, pretension and stretching rigidity. With free side edges we find good agreement with previous 2-D results that used different discretization methods. We find that the 3-D dynamics in the 12 cases naturally forms four groups based on the conditions at the leading and trailing edges. The deflection amplitudes and oscillation frequencies have scalings similar to those in the 2-D case. The conditions at the side edges, although generally less important, may have small or large qualitative effects on the membrane dynamics – e.g. steady vs unsteady, periodic vs chaotic or the variety of spanwise curvature distributions – depending on the group and the physical parameter values.

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“…2018; Schomberg et al. 2018; Tzezana & Breuer 2019), sails (Colgate 1996; Kimball 2009) parachutes (Pepper & Maydew 1971; Stein et al. 2000) and micro-air vehicles (Lian & Shyy 2005).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Membrane flutter in three-dimensional inviscid flow

Mavroyiakoumou

Alben

2022

J. Fluid Mech.

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“…Unlike a rigid wing that may experience flow separation at its upper surface and significant reductions in aerodynamic efficiency in both steady and unsteady flows, a flexible membrane wing is capable of deforming quickly and adapting to unsteady airflow conditions, thus preventing flow separation and enhancing aircraft maneuverability. Given this superiority in aerodynamic performance, membranes are used in miniature flappingwing aircraft [20], shape-morphing airfoils [20][21][22][23][24][25][26][27], parachutes [28,29], and sails [30,31]. An important design consideration for such structures is their stability and dynamics in simple flow situations.…”

Section: Introductionmentioning

confidence: 99%

Large-amplitude membrane flutter in inviscid flow

Mavroyiakoumou

Alben

2020

J. Fluid Mech.

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We study the large-amplitude flutter of membranes (of zero bending rigidity) with vortex-sheet wakes in 2D inviscid fluid flows. We apply small initial deflections and track their exponential decay or growth and subsequent large-amplitude dynamics in the space of three dimensionless parameters: membrane pretension, mass density, and stretching modulus. With both ends fixed, all the membranes converge to steady deflected shapes with single humps that are nearly fore-aft symmetric, except when the deformations are unrealistically large. With leading edges fixed and trailing edges free, the membranes flutter with very small amplitudes and high spatial and temporal frequencies at small mass density. As mass density increases, the membranes transition to periodic and then increasingly aperiodic motions, and the amplitudes increase and spatial and temporal frequencies decrease. With both edges free, the membranes flutter similarly to the fixedfree case but also translate vertically with steady, periodic, or aperiodic trajectories, and with nonzero slopes that lead to small angles of attack with respect to the oncoming

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“…Another important case that has received somewhat less attention is extensible membranes of zero bending modulus. Membranes arise in various biological and technological applications including membrane aircraft and shape-morphing airfoils (Lian and Shyy, 2005;Hu et al, 2008;Stanford et al, 2008;Jaworski and Gordnier, 2012;Piquee et al, 2018;Schomberg et al, 2018;Tzezana and Breuer, 2019), sails (Colgate, 1996;Kimball, 2009), parachutes (Pepper and Maydew, 1971;Stein et al, 2000), membrane roofs (Haruo, 1975;Knudson, 1991;Sygulski, 1996Sygulski, , 1997Sygulski, , 2007, and the wings of flying animals such as bats (Swartz et al, 1996;Song et al, 2008;Cheney et al, 2015). The majority of previous studies of membranes showed that when they are held with their ends fixed in a uniform oncoming fluid flow, they tend to adopt steady shapes with a single hump (that is, when the flat state is unstable) (Song et al, 2008;Mavroyiakoumou and Alben, 2020).…”

Section: Introductionmentioning

confidence: 99%

Dynamics of tethered membranes in inviscid flow

Mavroyiakoumou¹,

Alben²

2021

Preprint

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We investigate the dynamics of membranes that are held by freely-rotating tethers in fluid flows. The tethered boundary condition allows periodic and chaotic oscillatory motions for certain parameter values. We characterize the oscillations in terms of deflection amplitudes, dominant periods, and numbers of deflection extrema along the membranes across the parameter space of membrane mass density, stretching modulus, pretension, and tether length. We determine the region of instability and the small-amplitude behavior by solving a nonlinear eigenvalue problem. We also consider an infinite periodic membrane model, which yields a regular eigenvalue problem, analytical results, and asymptotic scaling laws. We find qualitative similarities among all three models in terms of the oscillation frequencies and membrane shapes at small and large values of membrane mass, pretension, and tether length/stiffness.

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Aerodynamic decelerators - An engineering review

Cited by 29 publications

References 40 publications

Membrane flutter in three-dimensional inviscid flow

Membrane flutter in three-dimensional inviscid flow

Large-amplitude membrane flutter in inviscid flow

Dynamics of tethered membranes in inviscid flow

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