19th AIAA Aerodynamic Decelerator Systems Technology Conference and Seminar 2007

DOI: 10.2514/6.2007-2538

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Experimental research on a vertically falling rotating wing decelerator model

Vicente Nadal Mora

¹

,

Joaquín Piechocki

²

,

Ángel Sanz Andrés

³

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Cited by 4 publications

(3 citation statements)

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“…Four types of blade were used for the tests. The first blade type tested was a thin rectangular flat plate of AR = 0.63, similar to those used in [8,9], which were taken as a reference. Two pairs of aluminum cambered plates were then tested, with cambers equal to 4% and 8% of the chord, and the fourth type of blade were flat plates of AR = 1.56.…”

Section: Model Description and Experimental Setupmentioning

confidence: 99%

“…Regarding the stability analysis of pararotors, different types of stability appear depending on the relationship between the principal moments of inertia and aerodynamic and configuration parameters. Stability regions and stability types are described and analyzed in [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…In [8][9][10]14] the behavior of pararotors equipped with low aspect ratio flat-plate blades was studied. These results are used as a reference for this work.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental study of the effect of blade curvature and aspect ratio on the performance of a rotary-wing decelerator

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2015

Aerospace Science and Technology

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No abstract

“…Four types of blade were used for the tests. The first blade type tested was a thin rectangular flat plate of AR = 0.63, similar to those used in [8,9], which were taken as a reference. Two pairs of aluminum cambered plates were then tested, with cambers equal to 4% and 8% of the chord, and the fourth type of blade were flat plates of AR = 1.56.…”

Section: Model Description and Experimental Setupmentioning

confidence: 99%

“…Regarding the stability analysis of pararotors, different types of stability appear depending on the relationship between the principal moments of inertia and aerodynamic and configuration parameters. Stability regions and stability types are described and analyzed in [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…In [8][9][10]14] the behavior of pararotors equipped with low aspect ratio flat-plate blades was studied. These results are used as a reference for this work.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental study of the effect of blade curvature and aspect ratio on the performance of a rotary-wing decelerator

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,

²

,

³

2015

Aerospace Science and Technology

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No abstract

Numerical simulation of pararotor dynamics: Effect of mass displacement from blade plane

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2016

Aerospace Science and Technology

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The pararotor is a biology-inspired decelerator device based on the autorotation of a rotary wing, whose main purpose is to guide a load descent into a certain planetary atmosphere. This paper focuses on a practical approach to the general dynamic stability of a pararotor whose center of mass is displaced from the blade plane. The numerical simulation tool developed is based upon the motion equations of pararotor flight, utilizing a number of simplifying hypotheses that allow the most influencing factors on flight behavior to be determined. Several simulated cases are analyzed to study the effect of different parameters associated with the pararotor configuration on flight dynamics, particularly the center of mass displacement from the blade plane. It was confirmed that the ability to reach stability conditions depends mainly on a limited number of parameters associated with the pararotor configuration: the relationship between principal moments of inertia, the planform shape (associated with blade aerodynamic coefficients and blade area) and the vertical distance between the center of mass and the blade plane. As a result different types of equilibrium solutions are found and the effect of each parameter is characterized. A bifurcation in the stability shape to a precessing conical rotation, not previously found in the linear stability analysis, is predicted by this numerical model.

Pararotor Dynamics: Center of Mass Displacement from the Blade Plane—Analytical Approach

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²

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³

2014

Journal of Aircraft

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The pararotor is a biology-inspired decelerator device based on the autorotation of a rotary wing whose main purpose is to guide a load descent into a certain atmosphere. This paper focuses on a practical approach to the general dynamic stability of a pararotor whose center of mass is displaced from the blade plane. The analytical study departs from the motion equations of pararotor flight, considering the center of mass displacement from the blade plane, studied over a number of simplifying hypotheses that allows determining the most important influences to flight behavior near equilibrium. Two practical indexes are developed to characterize the stability of a pararotor in terms of geometry, inertia, and the aerodynamic characteristics of the device. Based on these two parameters, a stability diagram can be defined upon which stability regions can be identified. It was concluded that the ability to reach stability conditions depends mainly on a limited number of parameters associated with the pararotor configuration: the relationship between moments of inertia, the position of the blades, the planform shape (associated with the blade aerodynamic coefficients and blade area), and the vertical distance between the center of mass and the blade plane. These parameters can be evaluated by computing practical indexes to determine stability behavior.

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