@misc{MarkerStammenBleicher, author = {Marker, Paul and Stammen, Lisa and Bleicher, Achim}, title = {Energy-efficient actuator placement for a convertible bending-active structure}, series = {IASS Annual Symposium 2019 - Structural Membranes 2019, Form and Force, 7-10 October 2019, Barcelona, Spain}, journal = {IASS Annual Symposium 2019 - Structural Membranes 2019, Form and Force, 7-10 October 2019, Barcelona, Spain}, address = {Barcelona, Spain}, pages = {1717 -- 1724}, language = {en} } @misc{BleicherSchauerJiraseketal., author = {Bleicher, Achim and Schauer, Thomas and Jirasek, Robert and H{\"o}ltke, Tim and Zhang, Yangwen and Marker, Paul and Wulff, Wulf and Manfrecola, Johannes and Schmidt, Therese}, title = {Hybride Konstruktionen an der BTU Cottbus-Senftenberg}, series = {Bautechnik}, volume = {98}, journal = {Bautechnik}, number = {12}, issn = {1437-0999}, doi = {10.1002/bate.202100056}, pages = {907 -- 920}, abstract = {Die angestrebten Ziele einer Ressourcen- und Klimaneutralit{\"a}t erfordern ein radikaleres Umdenken der Bauschaffenden, das mit einer noch viel st{\"a}rkeren Sensibilisierung der Auftraggeber f{\"u}r die Auswirkungen des Material- und Energieverbrauchs im Bausektor verbunden ist. Ein Ansatz, um diese Ziele zu erreichen, sind hybride Konstruktionen, in denen unterschiedliche Materialien, Elemente, Funktionen und Technologien auf mehreren Konstruktionsebenen ressourcen- und energieeffizient kombiniert sowie im Fall eines R{\"u}ckbaus sortenrein rezykliert werden. Dieser anspruchsvolle Ansatz ist von Beginn an erkl{\"a}rtes Ziel des Lehrstuhls Hybride Konstruktionen - Massivbau an der BTU Cottbus-Senftenberg und zieht sich durch alle Lehr- und Forschungsaktivit{\"a}ten. Mit ausgew{\"a}hlten Forschungsprojekten werden Motivation und Methoden hybrider Konstruktionen sowie deren Potenzial f{\"u}r ressourcen- und klimaneutrale Konstruktionen anhand von Prototypen aufgezeigt. Hierbei steht neben der {\"o}kologischen Weiterentwicklung klassischer hybrider Konstruktionen aus nachwachsenden und rezyklierten Rohstoffen, bspw. Holz und Recyclingbeton, auch die Entwicklung aktiver hybrider Konstruktionen im Fokus. Die gezielte Integration von aktiven Technologien wie Sensorik, Aktuatorik und Regelungstechnik erm{\"o}glicht multifunktionale Konstruktionen, einen hohen Nutzungskomfort, einen geringeren Rohstoffverbrauch bis hin zur Energiegewinnung aus dynamischen Einwirkungen.}, language = {de} } @misc{MarkerBleicher, author = {Marker, Paul and Bleicher, Achim}, title = {A Hierarchical Optimization Method for the Design of Active Hybrid Structures}, series = {Frontiers in Built Environment}, volume = {8}, journal = {Frontiers in Built Environment}, issn = {2297-3362}, doi = {10.3389/fbuil.2022.705434}, pages = {1 -- 22}, 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.}, language = {en} } @misc{MarkerJirasekSchmidtetal., author = {Marker, Paul and Jirasek, Robert and Schmidt, Therese and Bleicher, Achim}, title = {Development, realization, and experimental validation of an active hybrid roof structure based on elastic kinetic and rigid-body transformation}, series = {International Journal of Space Structures}, volume = {38 (2023)}, journal = {International Journal of Space Structures}, number = {2}, issn = {2059-8033}, doi = {10.1177/09560599221134286}, pages = {83 -- 100}, abstract = {Elastic kinetic structures are a recent approach to design transformable structures. Their transformation is based on elastic bending, that is compliant component behavior of structural members. This principle can be used to realize transformable structures with a stable deployment process. Regardless of a stable transformation, elastic kinetic structures are prone to static and dynamic loads due to their lightweight design. However, most of current research on these structures solely focuses on the principles of transformation. This paper proposes a concept for an active hybrid roof structure with a transformation based on elastic kinetics and rigid-body motion. The concept exhibits a stable structural deployment and active control components to counteract static and dynamic disturbances. Furthermore, this paper includes the realization and experimental evaluation of a mid-scale prototype structure.}, language = {en} } @phdthesis{Marker, author = {Marker, Paul}, title = {Generalized method for an efficient design of active hybrid structures : in the stress field between stiffness and compliance}, publisher = {Brandenburgische Technische Universit{\"a}t}, address = {Cottbus ; Senftenberg}, issn = {2569-2798}, doi = {10.26127/BTUOpen-6946}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-69466}, pages = {xxviii, 275}, abstract = {In structural engineering, active structures that combine the principles of lightweight construction with flexible component behavior are increasingly being realized. Within this approach, the lightweight design offers material-efficient structures which, due to their reduced mass, provide a good basis for an energy-efficient actuation. In addition, the use of flexible component behavior provides the possibility to keep the number of required actuators as low as possible, while maintaining a high degree of adaptability. Therefore, the resulting active hybrid structures represent a promising approach with respect to the development of sustainable active structures in our built environment. Due to a larger number of relevant objectives, this new kind of structures requires a higher design effort compared to classical structures from the field of structural engineering. This dissertation aims to contribute to a more efficient and generalized design process for active hybrid structures. In order to achieve this goal, several strategies have been investigated. First of all, useful target criteria related to the mentioned relevant areas are derived. These should enable a more target-oriented design and provide a basis for formulating appropriate target weighting, allowing the development of ideal compromise solutions that combine structural stiffness, bending elastic transformation behavior and an efficient actuation concept. In addition, a variety of approaches have been investigated to improve the design process of active hybrid structures in a broad stress field between stiffness and compliance. These mainly include the aspects of structure generation, analyses for an optimal load transfer as well as the determination of an associated optimal actuation concept. In the context of this thesis, different subroutines are investigated for the mentioned partial steps of an overall hierarchical method which were implemented in a software application. Some variations of this generalized method were applied to diverse structural case studies of cantilevered systems with different degrees of structural stiffness. Three of these examples, representing segments of roof structures that differ in terms of their bending elastic transformation behavior, were analyzed in more detail in this thesis. These analysis results were verified on real active hybrid prototypes.}, subject = {Tragwerk; Leichtbau; Hybridbauweise; Bauentwurf; Software}, language = {en} }