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Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. Adequate Mathematical BeamColumn Model for Active Buckling Control in a Tetrahedron Truss Structure
 Mao, Z. ; Society for Experimental Mechanics SEM, Bethel: Model Validation and Uncertainty Quantification, Vol.3 : Proceedings of the 38th IMAC, A Conference and Exposition on Structural Dynamics 2020, Houston, Texas, February 1013, 2020 Cham: Springer Nature, 2020 (Conference proceedings of the Society for Experimental Mechanics series) ISBN: 9783030487782 (Print) ISBN: 9783030476380 (Online) ISBN: 9783030476397 ISBN: 9783030476373 S.323332 
 International Modal Analysis Conference (IMAC) <38, 2020, Houston/Tex.> Conference and Exposition on Structural Dynamics <2020, Houston/Tex.> 

 Englisch 
 Konferenzbeitrag 
 Fraunhofer LBF () 
 BeamColumn Model; active buckling control 
Abstract
Active buckling control of compressively loaded beamcolumns provides a possibility to increase the maximum bearable axial load compared to passive beamcolumns. Reliable mathematical beamcolumn models that adequately describe the lateral dynamic behavior are required for the modelbased controller synthesis in order to avoid controller instability for real testing and application. This paper presents an adequate mathematical beamcolumn model for the active buckling control in a tetrahedron truss structure. Furthermore, it discusses model form uncertainty arising from model simplification of the global tetrahedron model to three local beamcolumn models. An experimental tetrahedron truss structure that comprises three passive beams and three active beamcolumns with piezoelastic supports for active buckling control is investigated. The tetrahedron is clamped at the three base nodes and free at the top node. In the two piezoelastic supports of each active beamcolumn, integrated piezoelectric stack actuators compensate lateral deflections due to increasing axial compressive loads and may, thus, prevent buckling. In previous works, active buckling control was investigated for a single beamcolumn that was clamped rigidly in an experimental test setup. A verified and validated single beamcolumn model with compliant boundary conditions was used to represent the piezoelastic supports for active buckling control. The mathematical model of the active beamcolumns is calibrated with experimental data from all three nominally identical active beamcolumns to account for uncertainty in manufacturing, assembly or mounting. Subsequently, they are compared with respect to the transfer functions and the first eigenfrequencies. It is shown that the boundary conditions of the single beamcolumn model may be calibrated to adequately describe the boundary conditions within the tetrahedron truss structure. Thus, it will be used for the modelbased controller synthesis in future investigations on the active buckling control of the tetrahedron truss structure.