Design of deployable bistable structures for morphing skin and its structural optimization

The morphing skin is the surface of a deployable frame which can change its shape to present optimal performance in all stages of a task for an aerospace vehicle. This article proposes a deployable frame with low kinematic error and high stability. Mechanical design and optimization of the deployable mechanism are developed, and specifically the analysis model of the deployable mechanism is established by the use of extendable units. The genetic algorithm is employed to find the optimal geometric parameters of the foldable structure. Furthermore, the design method of a bistable compliant mechanism is investigated to achieve the bistability. An example of a morphing leading edge (MLE) is analysed using the proposed method. The results show that the position errors converge to the optimal solution which supplies the minimum value. Numerical analysis indicates that the mechanism can provide two bistable positions for the actual use of the MLE.

[1]  Joycelyn S. Harrison,et al.  Aircraft Morphing program , 1998, Smart Structures.

[2]  Karl Keller,et al.  Variable curvature concepts for smart thermal protection systems (smart TPS) , 2005 .

[3]  Robert L. Norton,et al.  Design of Machinery , 1991 .

[4]  Joycelyn S. Harrison,et al.  Innovative materials for aircraft morphing , 1998, Smart Structures.

[5]  Dale Crane.  Dictionary of aeronautical terms , 1989 .

[6]  Andrei Vladimir Popov,et al.  New Aeroelastic Studies for a Morphing Wing , 2010 .

[7]  A. Midha,et al.  Parametric Deflection Approximations for End-Loaded, Large-Deflection Beams in Compliant Mechanisms , 1995 .

[8]  H. Nelson,et al.  Dictionary of aeronautical terms , 1946 .

[9]  Larry L. Howell,et al.  Evaluation of equivalent spring stiffness for use in a pseudo-rigid-body model of large-deflection compliant mechanisms , 1996 .

[10]  Larry L. Howell,et al.  A Method for the Design of Compliant Mechanisms With Small-Length Flexural Pivots , 1994 .

[11]  J. M. T. Thompson,et al.  Elimination of sub-harmonic resonances of compliant marine structures , 1984 .

[12]  Larry L. Howell,et al.  Design of two-link, in-plane, bistable compliant micro-mechanisms , 1999 .

[13]  Olcay Ersel Canyurt,et al.  Estimation of welded joint strength using genetic algorithm approach , 2005 .

[14]  G. K. Ananthasuresh,et al.  Freeform Skeletal Shape Optimization of Compliant Mechanisms , 2001, Adaptive Structures and Material Systems.

[15]  O. Canyurt.  Fatigue strength estimation of adhesively bonded tubular joint using genetic algorithm approach , 2004 .

[16]  Karl Keller,et al.  SMART THERMAL PROTECTION LEADING EDGES , 2006 .

[17]  Kalyanmoy Deb,et al.  Multi-objective optimization of a leg mechanism using genetic algorithms , 2005 .

[18]  Brian Sanders,et al.  Topology Synthesis of Distributed Actuation Systems for Morphing Wing Structures (Postprint) , 2007 .

[19]  Robert G. Loewy,et al.  REVIEW ARTICLE: Recent developments in smart structures with aeronautical applications , 1997 .

[20]  Brian Sanders,et al.  Topology Optimization Approach for the Determination of the Multiple-Configuration Morphing Wing Structure , 2008 .

[21]  Paolo Gaudenzi,et al.  Aeroheating reduction by adaptive thermal protection structures for a re-entry vehicle , 2003 .