C02 – Integrated Fluid-Actuators

C: Integrative Components

The integration of fluid actuators in structural elements such as beams or slabs is intended to optimize load transfer. This can lead to an increase in load-bearing capacity and, as a result, to mass savings.

Funding Phase II

Adaptivity is a way to optimize the load-bearing behavior of structures under changing loads. In this case, forces generated by actuators are induced into the structure in a targeted manner. This way, stresses and deformations caused by external effects can be counteracted by stresses and deformations generated through actuation. This reduces the overall stresses and the overall deformation of the structural element.

In the actuation concepts explored so far, the actuator forces are induced into the structural element over the surfaces and boundaries and manipulate the structure as a whole. The integration of actuators into the structural element offers the possibility of local, targeted manipulations exclusively where it is necessary.

In the first funding period, it was numerically and experimentally demonstrated for a concrete beam that local actuation with integrated fluid actuators and full compensation of deflection under load is possible. Since deformations are often decisive criteria for the dimensioning of the component cross-sections in components subjected to bending loads, a significant reduction in cross-section or increase in design load is thus possible.

BildA2_Prototyp eines Fluidaktors

Prototyp eines Fluidaktors Foto: (c) Christian Kelleter

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Funktionsmuster eines adaptiven Biegeträgers mit integrierten Fluidaktoren Foto: (c) Christian Kelleter

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Experimentelle Untersuchung eines adaptiven Biegeträgers mit integrierten fluiden Aktoren Foto: (c) Christian Kelleter

BildA5_Versuchsaufbau

Messung der Durchbiegung bei der experimentellen Untersuchung Foto: (c) Christian Kelleter

 

In the second funding period, the principles are now to be extended for multiaxial spanning slabs. These components generally comprise 50-75 % of the building mass in typical skeleton-frame constructions and thus offer an even greater potential for savings compared to the concrete beams investigated in the first funding period. Furthermore, the additional spatial dimension raises new questions. So far, Integrated actuators that meet the specific requirements of multiaxial load transfer do not exist in mechanical engineering or related domains. The central research question in subproject C02 is as follows:

How must fluid actuators be designed for integration into a plate structure? How can stresses, deformations, and vibrations be reduced with this system?

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Maximale Hauptspannungen einer passiven Platte unter Flächenlast Foto: (c) Markus Nitzlader

Within the SFB, subproject C02 is developing a novel concept for the actuation of a primary support structure. New scientific ground is being broken in the research of possible design principles and the component integration of the fluid actuators. The development of the fluid actuators and their integration into a structural element are closely linked and take place in cooperation between the respective disciplines.

The aim of the subproject is to develop actuation and actuator concepts for multiaxially stressed structures subjected to bending loads and to experimentally demonstrate the manipulation of the load transfer.

Principal Investigators

  • Prof. Dr.-Ing. Hansgeorg Binz, Institute for Engineering Design and Industrial Design
  • Prof. Dr.-Ing. M.Arch. Lucio Blandini, Institute for Lightweight Structures and Conceptual Design

Funding Phase I

Adaptive structures are one possibility to react to changing loads on structures. Forces generated by actuators are induced directly into the supporting structure. In this way, stresses and deformations are generated inside the component, which counteract the stresses and deformations caused by external influences. This reduces the overall stresses and deformations of the component.

In the actuation concepts investigated so far, the actuator forces are induced into the structural element via surfaces and edges. Thereby, the structural element is manipulated as a whole. By integrating actuators into the structural element it is possible to influence it locally. 

The main question of the subproject C02 is:

How can fluidic actuators be integrated into a structure and how can these reduce stresses and deformations?

The aim of the subproject is to develop a linear, bending-stressed structural element with integrated fluid actuators and to demonstrate the manipulation of the structural behaviour experimentally.

The subproject C02 develops new actuation concepts of a primary support structure. In the investigation of possible design principles and in the component integration of the structure integrated fluid actuators, new ground is being broken into science. The development and the integrational aspects are closely linked and cannot be considered separately.

Stuttgarter SmartShell

Stuttgarter SmartShell Foto: (c) ILEK

Hydraulisch aktuierbare Auflager der Stuttgarter SmartShell

Hydraulisch aktuierbare Auflager der Stuttgarter SmartShell Foto: (c) ILEK

Funktionsmuster eines adaptiven Biegeträgers mit integrierten Fluidaktoren

Funktionsmuster eines adaptiven Biegeträgers mit integrierten Fluidaktoren Foto: (c) Christian Kelleter

Prototyp eines Fluidaktors

Prototyp eines Fluidaktors Foto: (c) Christian Kelleter

Aktuierungskonzept eines Balkens mit integrierten Aktoren

Aktuierungskonzept eines Balkens mit integrierten Aktoren Foto: (c) IKTD/ILEK

The adaptation behavior of a concrete bending beam with integrated actuators was simulated. The simulation results were evaluated experimentally. It was proved that the local actuation of a concrete beam with integrated fluid actuators is possible. Furthermore the deflection of the loaded concrete beam could be completely compensated.

 
Experimental study of an adaptive beam with integrated fluidic actuators.
Experimental study of an adaptive beam with integrated fluidic actuators.

Principal Investigators

  • Prof. Dr.-Ing. Hansgeorg Binz, Institute for Engineering Design and Industrial Design
     
  • Prof. Dr.-Ing. Dr.-Ing. E. h. Dr. h.c. Werner Sobek, Institute for Lightweight Structures and Conceptual Design

Contact

This image shows Timon Burghardt

Timon Burghardt

M.Sc.

Wissenschaftlicher Mitarbeiter

This image shows Christian  Kelleter

Christian Kelleter

Dipl.-Ing.

Wissenschaftlicher Mitarbeiter

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