Publica
Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. Mathematical modeling and numerical simulation of an actively stabilized beamcolumn with circular crosssection
 Liao, W.H. ; Society of PhotoOptical Instrumentation Engineers SPIE, Bellingham/Wash.; American Society of Mechanical Engineers ASME: Active and Passive Smart Structures and Integrated Systems 2014 : 10–13 March 2014, San Diego, California, United States Bellingham, WA: SPIE, 2014 (Proceedings of SPIE 9057) ISBN: 9780819499837 Paper 90572H, 14 pp. 
 Conference "Active and Passive Smart Structures and Integrated Systems" <2014, San Diego/Calif.> 

 English 
 Conference Paper 
 Fraunhofer LBF () 
 numerical simulation 
Abstract
Buckling of axially loaded beamcolumns represents a critical design constraint for lightweight structures. Besides passive solutions to increase the critical buckling load, active buckling control provides a possibility to stabilize slender elements in structures. So far, buckling control by active forces or bending moments has been mostly investigated for beamcolumns with rectangular crosssection and with a preferred direction of buckling. The proposed approach investigates active buckling control of a beamcolumn with circular solid crosssection which is fixed at its base and pinned at its upper end. Three controlled active lateral forces are applied near the fixed base with angles of 120° to each other to stabilize the beamcolumn and allow higher critical axial loads. The beamcolumn is subject to supercritical static axial loads and lateral disturbance forces with varying directions and offsets. Two independent modal state space systems are derived for the bending planes in the lateral y and zdirections of the circular crosssection. These are used to design two linearquadratic regulators (LQR) that determine the necessary control forces which are transformed into the directions of the active lateral forces. The system behavior is simulated with a finite element model using onedimensional beam elements with six degrees of freedom at each node. With the implemented control, it is possible to actively stabilize a beamcolumn with circular crosssection in arbitrary buckling direction for axial loads significantly above the critical axial buckling load.