A Hierarchical Optimization Method for the Design of Active Hybrid Structures

Abstract

In structural engineering, active structures that combine the principles of lightweight construction with bending elastic component behavior are increasingly being investigated. For the realization of a prototype of an active hybrid roof structure at the laboratory of Hybrid Structures at BTU Cottbus-Senftenberg, preliminary investigations on a case study are conducted in the framework of this publication in order to improve the design process of these types of structures. These active hybrids require a higher design effort than classical structures from the field of structural engineering due to a larger number of relevant objectives. Consequently, this study devotes special attention to these essential target criteria and their mathematical formulation. Furthermore, in order to improve the efficiency of this design process, a hierarchical method is derived that is subdivided into two successive partial procedures, which contain specific heuristics that are developed. In this method, after structural optimization, an optimal actuator placement is performed. The subject of a design process involving optimal actuator placement is relatively unexplored for active structures in which components are subjected to large elastic bending deformations and is therefore the focus of this study. In order to verify the functionality of the method and the plausibility of the results of the derived partial methods, a validation of the methodology is performed. Therefore, results of analyses of an active truss structure are compared with those of an active hybrid structure, both derived using the presented method. In addition to validating results, the study intends to investigate whether the performance of an active hybrid structure generated by the proposed method is sufficiently competitive compared to a state-of-the-art active truss structure derived by the same procedure.

Development, realization, and experimental validation of an active hybrid roof structure based on elastic kinetic and rigid-body transformation

“…Based on previous investigations regarding energy efficient actuator placement for a similar structure, 8,12 we decided to realize a concept with actuation of the upper supports. This allows the actuators to be hidden inside the compression ring and the structure itself is kept simple and pure.…”

“…46 Investigations conducted at our Chair showed that the Fin Ray ® structure allows a very energy-efficient transformation when actuated at the supports. 12…”

“…The developed concept and the realized prototype are the result of preliminary investigated and developed methods at the Chair in the field of active structures. [8][9][10][11][12] In the first place the prototype is realized to test and experimentally validate these methods in a laboratory environment.…”

Investigation of Pressure Chambers for Integrated Fluidic Actuators in Adaptive Slabs

“…Further research with a focus on structure control, actuation concepts, and actuator placement can be found for multi-story buildings [21][22][23][24][25], and also for shells [26], ribbedstiffened slabs [27], bridges [28,29], shear walls [30] and truss structures [31]. Standardized actuators that are available on the market have been used when a realization has taken place.…”