The initiation of rotational motion of a lying object caused by wind gusts

Sanz Andres, Angel Pedro y Navarro Medina, Fermín (2010). The initiation of rotational motion of a lying object caused by wind gusts. "Journal of Wind Engineering and Industrial Aerodynamics", v. 98 (n. 12); pp. 772-783. ISSN 0167-6105. https://doi.org/10.1016/j.jweia.2010.07.002.

Descripción

Título: The initiation of rotational motion of a lying object caused by wind gusts
Autor/es:
  • Sanz Andres, Angel Pedro
  • Navarro Medina, Fermín
Tipo de Documento: Artículo
Título de Revista/Publicación: Journal of Wind Engineering and Industrial Aerodynamics
Fecha: Diciembre 2010
Volumen: 98
Materias:
Palabras Clave Informales: Non-steady loads; Train; Ballast; Erosion; Debris
Escuela: E.T.S.I. Aeronáuticos (UPM) [antigua denominación]
Departamento: Vehículos Aeroespaciales [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

In this paper, the initiation of motion of an object lying on a horizontal floor due to the aerodynamic force produced by a time-dependent wind is considered. It is assumed in this paper that when the aerodynamic force is large enough, the body starts to rotate around the most rearward supporting contact point, or pivoting point. This motion is analyzed by studying the dynamics of the rotation of the body around a pivoting point fixed to the floor, and placed in a gravity field under time-dependent aerodynamic loads produced by a non-steady incoming flow. This rotation initiation phase, which is relevant in the case of a time-varying gusty flow, is an intermediate phase between the two stages generally considered, namely, the initial static equilibrium without motion, and the final flight. In this intermediate phase, which is studied here, the rotational dynamics of the body should be taken into account and the gust characteristics as well, in order to determine whether once initiated the motion it leads to either a frustrated motion or to a successful one. A non-linear mathematical model has been developed, and a linear approximation is deduced, which allows us to obtain the condition for a successful flight. This condition shows two limits, valid for either long or short duration gusts, respectively. Some experiments have been performed in a gust wind tunnel, and results show a satisfactory agreement. To take into account the intrinsic random character of the phenomena in practical situations, expressions for the probability of exceeding the condition for successful flight under short duration gusts are obtained, assuming common probability density functions for the random parameters involved.

Más información

ID de Registro: 7379
Identificador DC: http://oa.upm.es/7379/
Identificador OAI: oai:oa.upm.es:7379
Identificador DOI: 10.1016/j.jweia.2010.07.002
URL Oficial: http://www.sciencedirect.com/science/journal/01676105
Depositado por: Memoria Investigacion
Depositado el: 10 Jun 2011 11:47
Ultima Modificación: 20 Abr 2016 16:30
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