Flectofin: a hingeless flapping mechanism inspired by nature

  title={Flectofin: a hingeless flapping mechanism inspired by nature},
  author={Julian Lienhard and Simon Schleicher and Simon Poppinga and Tom Masselter and Markus Milwich and Thomas Speck and Jan Knippers},
  journal={Bioinspiration \& Biomimetics},
This paper presents a novel biomimetic approach to the kinematics of deployable systems for architectural purposes. Elastic deformation of the entire structure replaces the need for local hinges. This change becomes possible by using fibre-reinforced polymers (FRP) such as glass fibre reinforced polymer (GFRP) that can combine high tensile strength with low bending stiffness, thus offering a large range of calibrated elastic deformations. The employment of elasticity within a structure… 

Fiber-Reinforced Plastics with Locally Adapted Stiffness for Bio-Inspired Hingeless, Deployable Architectural Systems

This paper presents results of the investigation of two biological role models, the shield bug (Graphosomaitalicum) and the carnivorous Waterwheel plant (Aldrovandavesiculosa). The aim was to

Design of a curved-line bending mechanism inspired by skin wrinkles for elastic–kinetic structures in architecture

The application of flexible materials for convertible structures in architecture and the use of bending deformation in these structures have been new topics in recent years. The importance of bending

Hindwings of insects as concept generator for hingeless foldable shading systems

In insights into biological findings and the development of a deployable structure inspired by the Flexagon model of hindwings of insects in general and the hierarchical structure of the wing cuticle of the shield bug (Graphosoma lineatum), which is partially transferred into a multi-layered structure with locally adapted stiffness.

Deformation Behavior of Elastomer-Glass Fiber-Reinforced Plastics in Dependence of Pneumatic Actuation

The bending angle increases with decreasing material stiffness and with increasing hinge width, while it is not affected by the flap stiffness itself, according to a finite element model software workflow.

Flectofold—a biomimetic compliant shading device for complex free form facades

Drawing inspiration from the hinge-less motion of the underwater snap-trap of the carnivorous waterwheel plant, the compliant facade shading device Flectofold was developed and the actuation principle of the plant can be identified.

Plant movements as concept generators for the development of biomimetic compliant mechanisms.

The knowledge on plant movement principles is summarized and how the different modes of actuation can be used in biomimetic approaches for the development motile technical systems are shown.

A Hinge-less Flapping Mechanism Inspired by Nature

ion of the Mechanism As a first step of abstraction, we focused on the deformation happening during the opening and shutting stage. Here, the trap’s elastic kinematics can be abstracted to a

Bio-inspired compliant mechanisms for architectural design : transferring bending and folding principles of plant leaves to flexible kinetic structures

This thesis proposes innovative concepts that integrate hitherto neglected structural behaviors, such as bending and buckling, into novel design and fabrication processes and offers an alternative to the prevailing paradigm of rigid-body mechanics.

Biomechanics and Functional Morphology of Plants—Inspiration for Biomimetic Materials and Structures

During the last decades, biomimetics has attracted increasing attention as well from basic and applied research as from various fields of industry. Biomimetics has a high innovation potential and

Toward a New Generation of Smart Biomimetic Actuators for Architecture

A theoretical concept for "escaping" the poroelastic regime is proposed, the possibilities for enhancing the mechanical properties of passive-hydraulic bilayer actuators are discussed, and the promising aspects for further studies to implement tropistic movement behavior are presented.



Elastic architecture: nature inspired pliable structures

At the interfaces of our mostly stationary architecture and surrounding nature we need to make constructions adaptable to ambient changes. Adaptability as a structural response to changing climate

Biomimetic Deployable Systems in Architecture

The high elasticity of plant structures represents the basis of many plant movements and also allows for reversible deformations. By analyzing suitable biological role models and using new

Snapping Surfaces

The responsive mechanism of the Venus flytrap has captured the interest of scientists for centuries. Although a complete understanding of the mechanism controlling the Venus flytrap movement has yet

Plant movements as concept generators for deployable systems in architecture

The first steps of the applied biomimetic working process are described: the selection of role models, investigation and basic abstraction of plant movements, which constitutes the basis for investigations on the valvular pollination.

Mechanics without muscle: biomechanical inspiration from the plant world.

Recent studies of plant biomechanics highlighting several current research themes in the field are summarized, including expulsion of high-speed reproductive projectiles, generation of slow movements by shrinking and swelling cell walls, effects of ontogenetic shifts in mechanical properties of stems, flexible reconfiguration and material properties of seaweeds under crashing waves, and the development of botanically-inspired commercial products.

Biomimetics and technical textiles: solving engineering problems with the help of nature's wisdom.

The significance of inspiration from nature for technical textiles and for fibrous composite materials is demonstrated by examples of already existing technical solutions that either parallel biology

Actuation systems in plants as prototypes for bioinspired devices

  • I. BurgertP. Fratzl
  • Engineering, Biology
    Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
  • 2009
Different mechanisms of organ movement in plants are reviewed and design principles of such systems may be particularly useful for a biomimetic translation into active technical composites and moving devices.

Fundamentals of Structural Stability

The ability of a structural assembly to carry loads and forces determines how stable it will be over time. Viewing structural assemblages as comprising columns, beams, arches, rings, and plates, this

First jump of microgel; actuation speed enhancement by elastic instability

Swelling-induced snap-buckling in a 3D micro hydrogel device, inspired by the insect-trapping action of Venus flytrap, makes it possible to generate astonishingly fast actuation. We demonstrate that