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기술보고서

기술보고서 게시판 내용
타이틀	Dynamic Shape Reconstruction of Three-Dimensional Frame Structures Using the Inverse Finite Element Method
저자	Gherlone, Marco;; Massimiliano, Priscilla Cerracchio;; Mattone, Massimiliano;; DiSciuva, Marco
Keyword	DETECTION;; DISPLACEMENT;; DYNAMIC STRUCTURAL ANALYSIS;; FINITE ELEMENT METHOD;; KINEMATICS;; REAL TIME OPERATION;; SMART STRUCTURES;; STRAIN GAGES;; STRUCTURAL FAILURE;; THIN WALLS;; TRANSVERSE LOADS;; TRUSSES;; VARIATIONAL PRINCIPLES;; VIBRATION DAMPING
URL	http://hdl.handle.net/2060/20110023655
보고서번호	NASA/TP-2011-217315
발행년도	2011
출처	NTRS (NASA Technical Report Server)
ABSTRACT	A robust and efficient computational method for reconstructing the three-dimensional displacement field of truss, beam, and frame structures, using measured surface-strain data, is presented. Known as shape sensing , this inverse problem has important implications for real-time actuation and control of smart structures, and for monitoring of structural integrity. The present formulation, based on the inverse Finite Element Method (iFEM), uses a least-squares variational principle involving strain measures of Timoshenko theory for stretching, torsion, bending, and transverse shear. Two inverse-frame finite elements are derived using interdependent interpolations whose interior degrees-of-freedom are condensed out at the element level. In addition, relationships between the order of kinematic-element interpolations and the number of required strain gauges are established. As an example problem, a thin-walled, circular cross-section cantilevered beam subjected to harmonic excitations in the presence of structural damping is modeled using iFEM;; where, to simulate strain-gauge values and to provide reference displacements, a high-fidelity MSC/NASTRAN shell finite element model is used. Examples of low and high-frequency dynamic motion are analyzed and the solution accuracy examined with respect to various levels of discretization and the number of strain gauges.