Fraunhofer-Gesellschaft

Publica

Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Active buckling control of an imperfect beam-column with circular cross-section using piezo-elastic supports and integral LQR control

 
: Schäffner, Maximilian; Platz, Roland

:
Fulltext (PDF; )

Bonisoli, E. ; Institute of Physics -IOP-, London:
13th International Conference on Motion and Vibration Control, MOVIC 2016 and the 12th International Conference on Recent Advances in Structural Dynamics, RASD 2016 : 4-6 July 2016, Southampton, UK
Bristol: IOP Publishing, 2016 (Journal of physics. Conference series 744)
ISBN: 978-1-5108-3057-8
Art. 012165, 13 pp.
International Conference on Motion and Vibration Control (MOVIC) <13, 2016, Southampton>
International Conference on Recent Advances in Structural Dynamics (RASD) <12, 2016, Southampton>
English
Conference Paper, Electronic Publication
Fraunhofer LBF ()

Abstract
For slender beam-columns loaded by axial compressive forces, active buckling control provides a possibility to increase the maximum bearable axial load above that of a purely passive structure. In this paper, the potential of active buckling control of an imperfect beam-column with circular cross-section using piezo-elastic supports is investigated numerically. Imperfections are given by an initial deformation of the beam-column caused by a constant imperfection force. With the piezo-elastic supports, active bending moments in arbitrary directions orthogonal to the beam-column's longitudinal axis can be applied at both beam- column's ends. The imperfect beam-column is loaded by a gradually increasing axial compressive force resulting in a lateral deformation of the beam-column. First, a finite element model of the imperfect structure for numerical simulation of the active buckling control is presented. Second, an integral linear-quadratic regulator (LQR) that compensate s the deformation via the piezo-elastic supports is derived for a reduced modal model of the ideal beam-column. With the proposed active buckling control it is possible to stabilize the imperfect beam-column in arbitrary lateral direction for axial loads above the theoretical critical buckling load and the maximum bearable load of the passive structure.

: http://publica.fraunhofer.de/documents/N-445246.html