AbstractThis paper develops and models the compliant spar concept that allows the wingspan to be varied to provide roll control and enhance the operational performance for a medium altitude, long endurance (MALE) UAV. The wing semispan is split into morphing partitions and the concept may be incorporated in each partition; however, only the tip partition is considered here. The compliant spar is made of compliant joints arranged in series to allow the partition to be flexible under axial (spanwise) loads, but at the same time stiff enough to resist bending loads. Each compliant joint consists of two concentric overlapping AL 2024-T3 tubes joined together using elastomeric material. Under axial (spanwise) loading, the elastomeric material deforms in shear, allowing the overlapping distance between the tubes to vary and hence the length (in the spanwise direction) of the joint/spar to vary. High fidelity modeling of the concept is performed. Then, structural design optimization studies are performed to minimize the axial stiffness and the structural mass of the concept for various design constraints. The flexible skin and actuation system to be used are also addressed.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Span Morphing Using the Compliant Spar



    Published in:

    Publication date :

    2015




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English



    Classification :

    BKL:    55.50 Luftfahrzeugtechnik / 55.60 Raumfahrttechnik / 51.40 Werkstoffe für bestimmte Anwendungsgebiete
    Local classification TIB:    770/7040



    Span Morphing Using the Compliant Spar

    Ajaj, R. M. / Saavedra Flores, E. I. / Friswell, M. I. et al. | ASCE | 2014


    Variable Wing Span Using the Compliant Spar Concept

    Ajaj, R.M. / Flores, E.S. / Friswell, M. et al. | British Library Conference Proceedings | 2013


    Variable Wing Span Using the Compliant Spar Concept

    Ajaj, Rafic M. / Saavedra Flores, Erick / Friswell, M. | AIAA | 2013


    VARIABLE SPAN MORPHING WING

    BAE JAE SUNG / HWANG JAI HYUK / CHOI SOO MIN | European Patent Office | 2015

    Free access

    PROPELLER BLADE HAVING COMPLIANT SPAR CORE

    NAGLE DAVID P / SMITH STEPHEN L | European Patent Office | 2015

    Free access