Structural Mechanics

Structural Mechanics

The structural mechanics group is active in the research areas of structural modeling, damping and control of structures, and computational dynamics. 

Structural modelling
Current activities within structural modelling include the development of an explicit format for large-deformation three-dimensional beam elements, and a general analysis procedure for anisotropic cross-sections based on a finite-thickness slice formulation.  In addition the area includes the development of a compact theory and computational procedure for cyclic plasticity, aiming specifically at reversed loading of offshore structures.

Damping and control of structures
Within damping and control of structures contributions have been made to the design principles for dampers on lightly damped flexible structural elements like cables and a general frequency-based design procedure for resonant dampers. Key contributions are the development of design based on the principle of ‘equal modal damping’, as well as a current extension to include the background flexibility from non-resonant modes. Currently, an effort is made to extend the principles originally developed in the group for passive mechanical devices to electro-mechanical devices with active control. 

Computational dynamics
The activities within computational dynamics are concentrated on the development of improved time integration techniques for non-linear structural response, and on formulations and computational aspects of multi-body dynamics. In both areas focus is on development of general energy and momentum conserving formulations that do not depend on local details within individual finite elements. Currently, a very accurate fourth-order time-integration scheme is under way, that has a sufficiently simple structure to offer an option for industrial use e.g. within offshore and wind energy. The damping/control concepts developed by the group are of general form, but also address the response characteristics of the structure in question rather directly and therefore typically lead to very robust design solutions. The methods for conservative and higher-order time-integration produce rather simple algorithms, permitting improved solutions with rather modest changes in current software. 

Contact

Jan Becker Høgsberg
Associate Professor
DTU Mechanical Engineering
+45 45 25 19 71
https://www.mek.dtu.dk/english/Sections/FAM/Research/Structural-Mechanics
7 APRIL 2020