Stability analysis of a free falling pararotor

The pararotor is a decelerator device based on the autorotation of a rotating wing. When it is dropped, it generates an aerodynamic force parallel to the main motion direction, acting as a decelerating force. In this paper, the rotational motion equations are shown for the vertical flight without an...

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Autores principales:	Nadal Mora, Vicente Javier, Sanz-Andrés, Angel
Formato:	Articulo Preprint
Lenguaje:	Inglés
Publicado:	2006
Materias:	Ingeniería Aeronáutica Aerodynamic characteristics Autorotation Angle of attack Inertial reference system Center of pressure Aspect ratio Dynamic analysis Helicopters Aviation Atmospheric conditions
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/127314
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-127314
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Ingeniería Aeronáutica Aerodynamic characteristics Autorotation Angle of attack Inertial reference system Center of pressure Aspect ratio Dynamic analysis Helicopters Aviation Atmospheric conditions
spellingShingle	Ingeniería Aeronáutica Aerodynamic characteristics Autorotation Angle of attack Inertial reference system Center of pressure Aspect ratio Dynamic analysis Helicopters Aviation Atmospheric conditions Nadal Mora, Vicente Javier Sanz-Andrés, Angel Stability analysis of a free falling pararotor
topic_facet	Ingeniería Aeronáutica Aerodynamic characteristics Autorotation Angle of attack Inertial reference system Center of pressure Aspect ratio Dynamic analysis Helicopters Aviation Atmospheric conditions
description	The pararotor is a decelerator device based on the autorotation of a rotating wing. When it is dropped, it generates an aerodynamic force parallel to the main motion direction, acting as a decelerating force. In this paper, the rotational motion equations are shown for the vertical flight without any lateral wind component and some simplifying assumptions are introduced to obtain analytic solutions of the motion. First, the equilibrium state is obtained as a function of the main parameters. Then the equilibrium stability is analyzed. The motion stability depends on two nondimensional parameters, which contain geometric, inertia, and aerodynamic characteristics of the device. Based on these two parameters a stability diagram can be defined. Some stability regions with different types of stability trajectories (nodes, spirals, focuses) can be identified for spinning motion around axes close to the major, minor, and intermediate principal axes. It is found that the blades contribute to stability in a case of spin around the intermediate principal inertia axis, which is otherwise unstable. Subsequently, the equations for determining the angles of nutation and spin of the body are obtained, thus defining the orientation of the body for a stationary motion and the parameters on which that position depends.
format	Articulo Preprint
author	Nadal Mora, Vicente Javier Sanz-Andrés, Angel
author_facet	Nadal Mora, Vicente Javier Sanz-Andrés, Angel
author_sort	Nadal Mora, Vicente Javier
title	Stability analysis of a free falling pararotor
title_short	Stability analysis of a free falling pararotor
title_full	Stability analysis of a free falling pararotor
title_fullStr	Stability analysis of a free falling pararotor
title_full_unstemmed	Stability analysis of a free falling pararotor
title_sort	stability analysis of a free falling pararotor
publishDate	2006
url	http://sedici.unlp.edu.ar/handle/10915/127314
work_keys_str_mv	AT nadalmoravicentejavier stabilityanalysisofafreefallingpararotor AT sanzandresangel stabilityanalysisofafreefallingpararotor
bdutipo_str	Repositorios
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Stability analysis of a free falling pararotor

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