Input modeling for active structural elements - extending the established FE-Work?ow for modeling of adaptive structures

Böhm, Michael; Wagner, Julia L.; Steffen, Simon; Gade, Jan; Geiger, Florian; Sobek, Werner; Bischoff, Manfred; Sawodny, Oliver

doi:10.1109/aim43001.2020.9158996

Cited by 12 publications

(15 citation statements)

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“…Im Vergleich dazu wirkt eine parallele Aktuierung eher lokal. Allerdings kann der parallele Aktor lediglich für die Beanspruchung aus der Aktuierung dimensioniert werden [14]. Die genaue Wirkung eines Aktors hängt also wesentlich von der Topologie ab.…”

Section: Entwurfs‐ Und Planungsmethodikunclassified

“…Um bei diesem Experimentalbau ein möglichst breites Versuchsspektrum abzubilden, wurde eine verhältnismäßig hohe Anzahl an Aktoren verbaut (Bild 16a). Neben dem Prinzip der Aktuierung selbst (elektrisch, hydraulisch, …) kann auch die Topologie der Aktuierung unterschiedlich ausfallen [14]. Die Unterteilung in serielle und parallele Aktuierung wurde bereits in Abschn.…”

Section: Demonstrator‐hochhausunclassified

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Adaptive Hüllen und Strukturen

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Die „Große Beschleunigung“ bei Bevölkerungszahlen, klimaschädlichen Emissionen, Wasserverbrauch und vielem anderen stellt die gesamte Menschheit vor große Herausforderungen. Dies trifft besonders auf das Bauschaffen zu. Es gilt, zukünftig für mehr Menschen mit weniger Material emissionsfrei zu bauen. Hierfür muss unsere Art des Planens, Bauens und Nutzens von Bauwerken neu gedacht und neu konzipiert werden. Auf der bautechnischen Seite bedeutet dies die konsequente flächendeckende Umsetzung von Leichtbaustrategien. Zu diesen zählt neben dem klassischen Leichtbau und den Gradientenbauweisen auch das Bauen mit adaptiven Hüllen und Strukturen. Unter Adaptivität sind dabei unterschiedliche Veränderungen der Geometrie, der physikalischen Eigenschaften von einzelnen Bauteilen oder von ganzen Bauwerken zu verstehen. Durch Adaption können Spannungsfelder homogenisiert, Bauteilverformungen reduziert und bauphysikalische Verhalten von Bauteilen verändert werden. All dies verringert nicht nur den Materialbedarf, sondern liefert auch einen wesentlichen Beitrag zur Steigerung des Nutzerkomforts. Adaptivität im weiteren Sinne bezeichnet einen ganzheitlichen Ansatz, in dem die Anpassung sozialer, kultureller und räumlicher Erfahrungen sowie architektonischer und planerischer Handlungsweisen eng mit den technologischen Entwicklungen verknüpft wird. Die Zusammenführung dieser Perspektiven ist Anspruch des SFB, um ganzheitliche Lösungen für eine zukünftige gebaute Umwelt zu finden.

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Section: Entwurfs‐ Und Planungsmethodikunclassified

Section: Demonstrator‐hochhausunclassified

Adaptive Hüllen und Strukturen

et al. 2021

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“…One major difference, which is also relevant for the design of actuators, is the difference in the loading of the actuator. Installation in series means that the actuator itself also has to carry permanent loads acting on the element, while the parallel actuator only has to withstand the actuation forces during actuation [21,35]. Furthermore, for constrained systems such in Figure 2, a reduction of deformations through actuation in series results in additional stresses in the actuator element.…”

Section: Basic Conceptsmentioning

confidence: 99%

An Actuator Concept for Adaptive Concrete Columns

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The building industry accounts for half of the global resource consumption and roughly one third of global CO2 emissions. Global population growth and increasing resource scarcities require engineers and architects to build for more people with less material and emissions. One promising solution are adaptive load-bearing structures. Here, the load-bearing structure is equipped with actuators, sensors, and a control unit which allows the structure to adapt to different load cases, resulting in substantial material savings. While the first prototypes use industry standard actuators to manipulate deformations and stress states, it is essential to develop actuator concepts which fit the specific requirements of civil engineering structures. This paper introduces new concepts for linear actuators, developed within the Collaborative Research Centre (SFB) 1244 Adaptive Skins and Structures for the Built Environment of Tomorrow, which can be used as adaptive concrete columns. The concept of an actuator which actuates a concrete column by external compression through hydraulic pressure is discussed in further detail. This concept allows for controlled axial extension while also increasing the compressive strength of the concrete column.

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“…with the symmetric mass matrices M p ∈ R Np×Np and M q ∈ R Nq×Nq , the square skew-symmetric interconnection matrix J with P ∈ R Np×Nq , the input matrix G and the boundary input variables u ∂ . The latter are the efforts φ T q e q and their spatial derivatives, appearing in the second term on the right hand side in (30), evaluated at the boundary. According to the effort definitions in Sec.…”

Section: Spatial Discretizationmentioning

confidence: 99%

“…In a recent publication of some of the authors, a method for the integration of actuators into FE models of adaptive structures is presented [30]. To allow for an easy integration of active elements, a quasi-stationary assumption is made for the local dynamics of passive elements.…”

Section: Multi-domain Systemmentioning

confidence: 99%

A port-Hamiltonian approach to modeling the structural dynamics of complex systems

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Sawodny

et al. 2021

Applied Mathematical Modelling

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With this contribution, we give a complete and comprehensive framework for modeling the dynamics of complex mechanical structures as port-Hamiltonian systems. This is motivated by research on the potential of lightweight construction using active load-bearing elements integrated into the structure. Such adaptive structures are of high complexity and very heterogeneous in nature. Port-Hamiltonian systems theory provides a promising approach for their modeling and control. Subsystem dynamics can be formulated in a domain-independent way and interconnected by means of power flows. The modular approach is also suitable for robust decentralized control schemes. Starting from a distributed-parameter port-Hamiltonian formulation of beam dynamics, we show the application of an existing structure-preserving mixed finite element method to arrive at finite-dimensional approximations. In contrast to the modeling of single bodies with a single boundary, we consider complex structures composed of many simple elements interconnected at the boundary. This is analogous to the usual way of modeling civil engineering structures which has not been transferred to port-Hamiltonian systems before. A block diagram representation of the interconnected systems is used to generate coupling constraints which leads to differential algebraic equations of index one. After the elimination of algebraic constraints, systems in input-state-output (ISO) port-Hamiltonian form are obtained. Port-Hamiltonian system models for the considered class of systems can also be constructed from the mass and stiffness matrices obtained via conventional finite element methods. We show how this relates to the presented approach and discuss the differences, promoting a better understanding across engineering disciplines. A Matlab framework is available on http://github.com/awarsewa/ph_fem/ to facilitate the application of the methods to different problems.

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Input modeling for active structural elements - extending the established FE-Work?ow for modeling of adaptive structures

Cited by 12 publications

References 12 publications

Adaptive Hüllen und Strukturen

Adaptive Hüllen und Strukturen

An Actuator Concept for Adaptive Concrete Columns

A port-Hamiltonian approach to modeling the structural dynamics of complex systems

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