Pararotor dynamics: center of mass displacement from the blade plane—analytical approach

Piechocki, Joaquín and Nadal Mora, Vicente J. and Sanz Andres, Angel Pedro (2014). Pararotor dynamics: center of mass displacement from the blade plane—analytical approach. "Journal of Aircraft", v. 51 (n. 2); pp. 651-660. ISSN 0021-8669. https://doi.org/10.2514/1.C032378.

Description

Title: Pararotor dynamics: center of mass displacement from the blade plane—analytical approach
Author/s:
  • Piechocki, Joaquín
  • Nadal Mora, Vicente J.
  • Sanz Andres, Angel Pedro
Item Type: Article
Título de Revista/Publicación: Journal of Aircraft
Date: 2014
ISSN: 0021-8669
Volume: 51
Subjects:
Faculty: Instituto de Microgravedad Ignacio Da Riva (UPM)
Department: Aeronaves y Vehículos Espaciales
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

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.

More information

Item ID: 39467
DC Identifier: http://oa.upm.es/39467/
OAI Identifier: oai:oa.upm.es:39467
DOI: 10.2514/1.C032378
Official URL: http://arc.aiaa.org/doi/abs/10.2514/1.C032378
Deposited by: Biblioteca ETSI Aeronauticos
Deposited on: 25 Feb 2016 13:46
Last Modified: 25 Feb 2016 13:46
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