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Frontiers of Mechanical Engineering

Front Mech Eng    2013, Vol. 8 Issue (1) : 17-32     https://doi.org/10.1007/s11465-013-0364-5
RESEARCH ARTICLE
Kinematical synthesis of an inversion of the double linked fourbar for morphing wing applications
J. AGUIRREBEITIA(), R. AVILéS, I. FERNáNDEZ, M. ABASOLO
Department of Mechanical engineering, ETSI-BILBAO, Vizcaya 48013, Spain
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Abstract

This paper presents the kinematical features of an inversion of the double linked fourbar for morphing wing purposes. The structure of the mechanism is obtained using structural synthesis concepts, from an initial conceptual schematic. Then, kinematic characteristics as instant center of rotation, lock positions, dead point positions and uncertainty positions are derived for this mechanism in order to face the last step, the dimensional synthesis; in this sense, two kinds of dimensional synthesis are arranged to guide the wing along two positions, and to fulfill with the second one some aerodynamic and minimum actuation energy related issues.

Keywords morphing wing      structural synthesis      dimensional synthesis      geometrical kinematics     
Corresponding Author(s): AGUIRREBEITIA J.,Email:josu.aguirrebeitia@ehu.es   
Issue Date: 05 March 2013
 Cite this article:   
J. AGUIRREBEITIA,R. AVILéS,I. FERNáNDEZ, et al. Kinematical synthesis of an inversion of the double linked fourbar for morphing wing applications[J]. Front Mech Eng, 2013, 8(1): 17-32.
 URL:  
http://journal.hep.com.cn/fme/EN/10.1007/s11465-013-0364-5
http://journal.hep.com.cn/fme/EN/Y2013/V8/I1/17
Fig.1  Wing morphing concepts (adapted from Ref. [])
Fig.2  Schematic of the morphing wing mechanism.
Fig.3  Actuation fourbar mechanism. (a) Fourbar mechanism; (b) rigid-solid movement; (c) compliant-solid movement; (d) extreme mechanical advantage positions; (e) fully aligned positions
Fig.4  Proposed new actuation mechanism
Fig.5  Kinematic chain and derived mechanisms. (a) Kinematic chain; (b) double linked fourbar; (c) actuation mechanism
Fig.6  Instantaneous center of rotation of the wing (element 8) as rigid element
Fig.7  Position with instantaneous rotation about one of the fixed points
Fig.8  Simple lock position. Element 3 gets locked
Fig.9  Double lock position. Both elements 2 and 3 get locked
Fig.10  Dead point position. Wing element remains locked
Fig.11  Fully aligned positions
Fig.12  Inversion in the fully aligned position
Fig.13  Curvature centers for points and
Fig.14  Instantaneous equivalent fourbar mechanisms
Fig.15  Instantaneous centers of rotation of wing element in uncertainty position
Fig.16  Movement inversion for rigid-solid guidance problem
Fig.17  Fourbar with aligned coupler point. (a) Topology; (b) two position rigid body guidance synthesis
Fig.18  Synthesis of the fourbar with aligned coupler point. (a) Procedure; (b) resulting mechanism in two positions
Fig.19  Change of the center of buoyancy with the orientation of the wing
Fig.20  Synthesis prearrangement. (a) Determination of the center of rotation; (b) relocation of the extreme positions
Fig.21  Synthesis arrangement. (a) Problem data; (b) problem solution
Fig.22  Synthesis arrangement for the example outlined
Fig.23  Solution mechanism
Fig.24  Minimization worksheet for Fourbar I
Fig.25  Three positions for the wing mechanism. (a) Angle of the wing element 0o; (b) angle of the wing element 7.5o; (c) angle of the wing element 15o
Fig.26  Conservation of the instant center of rotation of the wing
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