TY - GEN A1 - Jirasek, Robert A1 - Schauer, Thomas A1 - Bleicher, Achim T1 - Multi-Variable Active Vibration Control for a Footbridge With Regard to Vertical Bending and Torsional Modes T2 - The 13th International Workshop on Advanced Smart Materials and Smart Structures Technology, July 22-23, 2017, The University of Tokyo, Japan Y1 - 2017 UR - https://www.researchgate.net/publication/319830150_Multi-Variable_Active_Vibration_Control_for_a_Footbridge_With_Regard_to_Vertical_Bending_and_Torsional_Modes CY - Tokyo, Japan ER - TY - GEN A1 - Schauer, Thomas A1 - Liu, Xiaohan A1 - Jirasek, Robert A1 - Bleicher, Achim T1 - Acceleration-based active vibration control of a footbridge using grey-box model identification T2 - 2017 IEEE International Conference on Advanced Intelligent Mechatronics (AIM), Munich, Germany Y1 - 2017 SN - 978-1-5090-6000-9 SN - 978-1-5090-5998-0 U6 - https://doi.org/10.1109/AIM.2017.8014134 SP - 910 EP - 915 PB - IEEE CY - Piscataway, NJ ER - TY - GEN A1 - Jirasek, Robert A1 - Schauer, Thomas A1 - Bleicher, Achim ED - Schlaich, Mike ED - Goldack, Arndt T1 - Model-based active vibration control for next generation bridges using reduced finite element models T2 - Footbridge 2017 Berlin - Tell A Story, 6-8.9.2017, Technische Universität Berlin (TU Berlin) Y1 - 2017 SN - 978-3-9818968-0-0 U6 - https://doi.org/10.24904/footbridge2017.09291 SP - 414 EP - 415 PB - Chair of Conceptual and Structural Design, Fachgebiet Entwerfen und Konstruieren – Massivbau, Technische Universität Berlin CY - Berlin ER - TY - GEN A1 - Jirasek, Robert A1 - Schauer, Thomas A1 - Bleicher, Achim T1 - Linear Parameter-Varying Models for Convertible Structures in Civil and Structural Engineering T2 - IFAC-PapersOnLine N2 - This paper investigates the feasibility of the linear parameter-varying (LPV) framework for modelling the dynamic behaviour of ultra-lightweight convertible structures based on the elastic kinetic motion mechanism with a focus on civil and structural engineering applications. Model building is carried out for the example of a Fin Ray structure. In a first step local linear time-invariant (LTI) models are derived from a finite element model of the structure for different transformation states. On the basis of this collection of local LTI models, a grid-based LPV model is established. The derived LPV model is validated in simulation by comparison with data from a finite element model. Y1 - 2019 UR - http://www.sciencedirect.com/science/article/pii/S2405896319317288 U6 - https://doi.org/10.1016/j.ifacol.2019.11.734 SN - 2405-8963 VL - 52 IS - 15 SP - 555 EP - 560 ER - TY - GEN A1 - Jirasek, Robert A1 - Schauer, Thomas A1 - Bleicher, Achim ED - Mercère, Guillaume T1 - Active Vibration Control of a Convertible Structure based on a Linear Parameter-Varying Model T2 - 3rd IFAC Workshop on Linear Parameter Varying Systems, November 4-6, 2019 N2 - This paper investigates modelling and active vibration control (AVC) of ultra-lightweight convertible structures based on the elastic kinetic motion mechanism with a focus on civil and structural engineering applications. Model building is carried out in the linear parameter-varying (LPV) framework for the example of a convertible Fin Ray structure. In a first step local linear time-invariant (LTI) models are derived from a finite element model of the structure for different transformation states. On the basis of this collection of local LTI models, a grid-based LPV model is established. An AVC of multiple modes is implemented by means of a modal velocity feedback control. Single-input single-output (SISO) control design is carried out with the root locus method for the first and second mode using the same control input under the assumption of well separated eigenfrequencies. The implemented AVC is validated in simulation. Y1 - 2019 UR - http://www.sciencedirect.com/science/article/pii/S240589631932275X U6 - https://doi.org/10.1016/j.ifacol.2019.12.375 SN - 2405-8963 VL - 52 IS - 28 SP - 190 EP - 195 CY - Eindhoven, The Netherlands ER - TY - GEN A1 - Jirasek, Robert A1 - Schauer, Thomas A1 - Bleicher, Achim T1 - Active Vibration Control of a Convertible Structure Based on a Polytopic LPV Model Representation T2 - IFAC-PapersOnLine N2 - This paper deals with modeling and control of lightweight convertible structures for the application in civil and structural engineering. Such structures are prone to vibrations due to their lightweight design. In addition, they exhibit transformation state dependent dynamic behavior. In order to guarantee a reliable operation, the use of active vibration control (AVC) is an effective means. For the example of a simplified convertible structure, modeling is demonstrated using the linear parameter-varying (LPV) framework. Based on local linear time-invariant (LTI) models, derived from a finite element model of the convertible structure, a polytopic LPV model is established. This LPV model is then utilized to design a polytopic LPV output-feedback controller for AVC during the structure’s transformation. The effectiveness of the designed controller is validated in simulation. Y1 - 2020 UR - https://www.sciencedirect.com/science/article/pii/S2405896320321868 U6 - https://doi.org/10.1016/j.ifacol.2020.12.1590 SN - 2405-8963 VL - 53 IS - 2 SP - 8389 EP - 8394 ER - TY - GEN A1 - Bleicher, Achim A1 - Schauer, Thomas A1 - Jirasek, Robert A1 - Höltke, Tim A1 - Zhang, Yangwen A1 - Marker, Paul A1 - Wulff, Wulf A1 - Manfrecola, Johannes A1 - Schmidt, Therese T1 - Hybride Konstruktionen an der BTU Cottbus-Senftenberg T2 - Bautechnik N2 - Die angestrebten Ziele einer Ressourcen- und Klimaneutralität erfordern ein radikaleres Umdenken der Bauschaffenden, das mit einer noch viel stärkeren Sensibilisierung der Auftraggeber für 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 Rückbaus sortenrein rezykliert werden. Dieser anspruchsvolle Ansatz ist von Beginn an erklärtes Ziel des Lehrstuhls Hybride Konstruktionen – Massivbau an der BTU Cottbus-Senftenberg und zieht sich durch alle Lehr- und Forschungsaktivitäten. Mit ausgewählten Forschungsprojekten werden Motivation und Methoden hybrider Konstruktionen sowie deren Potenzial für ressourcen- und klimaneutrale Konstruktionen anhand von Prototypen aufgezeigt. Hierbei steht neben der ökologischen 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 ermöglicht multifunktionale Konstruktionen, einen hohen Nutzungskomfort, einen geringeren Rohstoffverbrauch bis hin zur Energiegewinnung aus dynamischen Einwirkungen. Y1 - 2021 UR - https://onlinelibrary.wiley.com/doi/abs/10.1002/bate.202100056 U6 - https://doi.org/10.1002/bate.202100056 SN - 1437-0999 VL - 98 IS - 12 SP - 907 EP - 920 ER - TY - GEN A1 - Marker, Paul A1 - Jirasek, Robert A1 - Schmidt, Therese A1 - Bleicher, Achim T1 - Development, realization, and experimental validation of an active hybrid roof structure based on elastic kinetic and rigid-body transformation T2 - International Journal of Space Structures N2 - 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. Y1 - 2022 U6 - https://doi.org/10.1177/09560599221134286 SN - 2059-8033 VL - 38 (2023) IS - 2 SP - 83 EP - 100 ER - TY - GEN A1 - Jirasek, Robert A1 - Schauer, Thomas A1 - Bleicher, Achim T1 - Linear parameter-varying output-feedback for active vibration control of an elastic kinetic roof structure with experimental validation T2 - Engineering Structures N2 - Elastic kinetics are an approach to design transformable lightweight structures with a stable transformation process. The transformation is realized through elastic bending of structural members by exploiting the compliant material behavior. This lightweight and flexible design comes at the cost of increased sensitivity to static and dynamic disturbances. However, most of the current research focuses on the principles of elastic kinetic transformation instead of effective disturbance mitigation. This work focuses on dynamic disturbance mitigation for such transformable lightweight structures using active control. Modeling and controller synthesis are performed in the linear parameter-varying (LPV) framework, since the dynamics of elastic kinetic structures are transformation-state dependent due to geometric nonlinearities. Based on an LPV model in a grid-based representation, an LPV output-feedback control can be designed and synthesized via a gridding approach. This methodology is experimentally tested and validated for the example of an active hybrid roof structure prototype. Y1 - 2024 UR - https://www.sciencedirect.com/science/article/pii/S0141029624004498 U6 - https://doi.org/10.1016/j.engstruct.2024.117887 SN - 0141-0296 VL - 307 SP - 1 EP - 12 ER - TY - THES A1 - Jirasek, Robert T1 - The linear parameter-varying framework for active vibration control of elastic kinetic structures N2 - Lightweight design is essential for preserving resources, and in addition, transformability can be beneficial for specific applications where multi-functionality is required. Multi-functionality contributes to saving resources by allowing multiple purposes to be served effectively and by allowing adaptation to changing needs. Elastic kinetics are a recent approach to design transformable lightweight structures with a stable transformation process, realized by elastic bending of structural members. Their lightweight and flexible design comes at the cost of increased sensitivity to static and dynamic disturbances. However, most of the current research concentrates on transformation principles instead of on disturbance mitigation. This research focuses on dynamic disturbance mitigation for transformable lightweight structures based on elastic kinetics using active control. The dynamic behavior of such structures is transformation state dependent due to geometric nonlinearities, which is not easily captured by linear time-invariant methods. For this reason, modeling and control design are performed in the linear parameter-varying (LPV) framework. Thereby, two distinct LPV modeling methodologies are investigated, one based on finite element models and another utilizing experimental system identification techniques. Furthermore, LPV control strategies are introduced, which allow to adapt to the varying structural dynamics encountered in elastic kinetics. To validate the efficacy of the modeling and control approaches, a physical demonstrator resembling a segment of an elastic kinetic roof structure is realized within a laboratory environment. This demonstrator structure is used for experimental studies to assess the accuracy and performance of the introduced methods. Utilizing experimental data from the demonstrator structure, a proposed LPV system identification methodology can be applied to derive separate LPV models for the bending and the torsional dynamics of the demonstrator structure. Based on the derived LPV models, a decoupled active vibration control for bending and torsional dynamics by means of an LPV output-feedback is designed. The designed control is implemented on a real-time environment, and its effectiveness is demonstrated experimentally for fixed and for varying operating conditions on the realized demonstrator structure. T2 - Linear parameter-veränderliche Methoden zur aktiven Schwingungskontrolle von elastisch-kinetischen Strukturen Y1 - 2024 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:co1-opus4-67698 PB - BTU Cottbus-Senftenberg CY - Cottbus ER - TY - GEN A1 - Jirasek, Robert A1 - Schauer, Thomas A1 - Su, Di A1 - Nagayama, Tomonori A1 - Bleicher, Achim T1 - Experimental linear parameter-varying model identification of an elastic kinetic roof structure T2 - Engineering Structures N2 - Elastic kinetic structures are a recent approach to design transformable lightweight structures. Their transformation is based on elastic bending, exploiting the compliant material behavior of the structural members. This enables transformable structures with a stable transformation process. However, due to their lightweight and flexible design, elastic kinetic structures are highly sensitive to static and dynamic disturbances. Moreover, such transformable structures exhibit a transformation state dependent dynamic behavior, due to geometric nonlinearities. Nevertheless, most of current research focuses on the principles of elastic kinetic transformation than on effective disturbance mitigation. The latter is usually designed based on low-order control-oriented models. This paper describes a system identification methodology, suitable to identify low-order models for the transformation state dependent dynamics of elastic kinetic structures. The system identification is carried out using a local approach in the linear parameter-varying (LPV) framework. For the identification of local linear time-invariant (LTI) models, the system realization using the information matrix (SRIM) method is applied. The collection of local LTI models is internally balanced using a balancing transformation, in order to represent the locally estimated models with respect to a common state–space basis. Via linear interpolation, an LPV system in grid-based representation is derived. This methodology is experimentally validated with data from an active hybrid roof structure prototype. Y1 - 2023 UR - https://linkinghub.elsevier.com/retrieve/pii/S0141029623014013 U6 - https://doi.org/10.1016/j.engstruct.2023.116986 SN - 0141-0296 VL - 297 SP - 1 EP - 13 ER -