Shape sensing of aerospace structures by coupling of isogeometric analysis and inverse finite element method

Kefal, Adnan and Oterkus, Erkan; (2017) Shape sensing of aerospace structures by coupling of isogeometric analysis and inverse finite element method. In: 58th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. AIAA SciTech Forum . American Institute of Aeronautics and Astronautics Inc., USA. ISBN 9781624104535 (https://doi.org/10.2514/6.2017-0427)

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Abstract

This paper presents a novel isogeometric inverse Finite Element Method (iFEM) formulation, which couples the NURBS-based isogeometric analysis (IGA) together with the iFEM methodology for shape sensing of complex/curved thin shell structures. The primary goal is to be geometrically exact regardless of the discretization size and to obtain a smoother shape sensing even with less number of strain sensors. For this purpose, an isogeometric KirchhoffLove inverse-shell element (iKLS) is developed on the basis of a weighted-least-squares functional that uses membrane and bending strain measures consistent with the KirchhoffLove shell theory. The novel iKLS element employs NURBS not only as a geometry discretization technology, but also as a discretization tool for displacement domain. Therefore, this development serves the following beneficial aspects of the IGA for the shape sensing analysis based on iFEM methodology: (1) exact representation of computational geometry, (2) simplified mesh refinement, (3) smooth (high-order continuity) basis functions, and finally (4) integration of design and analysis in only one computational domain. The superior capabilities of iKLS element for shape sensing of curved shells are demonstrated by various case studies including a pinched hemisphere and a partly clamped hyperbolic paraboloid. Finally, the effect of sensor locations, number of sensors, and the discretization of the geometry on solution accuracy is examined.

  • Item type:Book Section
    ID code:60789
    Dates:
    Date
    Event
    9 January 2017
    Published
    6 December 2016
    Accepted
    Notes:©2017 AIAA Kefal, A., & Oterkus, E. (2017). Shape sensing of aerospace structures by coupling of isogeometric analysis and inverse finite element method. In 58th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. [AIAA 2017-0427] (AIAA SciTech Forum). Reston, VA: American Institute of Aeronautics and Astronautics Inc.. DOI: 10.2514/6.2017-0427
    Subjects:Technology > Motor vehicles. Aeronautics. Astronautics
    Department:Faculty of Engineering > Naval Architecture, Ocean & Marine Engineering
    Depositing user: Pure Administrator
    Date deposited:26 May 2017 15:45
    Last modified:08 Apr 2024 13:40
    URI:https://strathprints.strath.ac.uk/id/eprint/60789
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