scholarly journals TOWARDS THE DESIGN OF KRESLING TOWER ORIGAMI AS A COMPLIANT BUILDING BLOCK

2021 ◽  
pp. 1-12
Author(s):  
John Berre ◽  
François Geiskopf ◽  
Lennart Rubbert ◽  
Pierre Renaud
Keyword(s):  
Building Block ◽  
Compliant Mechanism ◽  
Design Tools ◽  
Helical Motion ◽  
Actuation Force ◽  
Fold Line ◽  
Building Systems ◽  
Local Modification ◽  
The Impact ◽  
Compliant Mechanism Design

Abstract In this paper, the use of the Kresling tower origami as a building block for compliant mechanism design is considered. Design tools to help building systems using this origami are introduced. First, a model which can describe the tower kinematics during its deployment is introduced. This model is exploited to link the origami pattern geometry to the main Kresling tower characteristics which include the position of stable configurations, the helical motion and the configuration of panels during the tower deployment. Second, a local modification of fold geometry is introduced to adjust the tower stiffness. This aims at modifying the actuation force without affecting the kinematics and consists in the removal of material on the fold line where constraints are concentrated during the folding. Experimental evaluation is conducted to verify the relevance of the proposed models and the impact of fold line modification. As a result, the design relationships derived from the model are precise enough for the synthesis, with a global relative mean error around 0.8% for the prediction of the helical motion, and 3.1% for the assessment of stable configurations. The capacity to significantly modify the actuation force thanks to the fold line modification is also observed with a reduction of about 73% of the maximal force to switch between two stable configurations.

Towards a Synthesis Method of Kresling Tower Used as a Compliant Building Block

2021 ◽  
Author(s):  
John Berre ◽  
Francois Geiskopf ◽  
Lennart Rubbert ◽  
Pierre Renaud
Keyword(s):  
Mechanism Design ◽  
Building Block ◽  
Experimental Validation ◽  
Compliant Mechanism ◽  
Synthesis Method ◽  
Helical Motion ◽  
Lead Angle ◽  
Compliant Mechanism Design

Abstract In this paper, the use of the Kresling tower origami as a building block for compliant mechanism design is considered. Two contributions are introduced to develop a synthesis method of such a building block. First, models to link the origami pattern geometry to the Kresling tower kinematics are derived. The position of stable configurations, the lead angle of its helical motion are expressed as functions of the pattern parameters. Experimental validation of the models is performed. Second, a modification of pattern by local adjustment of fold geometry is introduced. This aims at modifying the origami stiffness without affecting the kinematics. The use of modified fold geometries is experimentally investigated. The capacity to strongly modify the stiffness level is observed, which is encouraging to go towards a synthesis method with decoupling of kinematics and stiffness selection.

scholarly journals Smooth Design of 3D Self-Supporting Topologies Using Additive Manufacturing Filter and SEMDOT

2020 ◽  
Vol 11 (1) ◽  
pp. 238
Author(s):  
Yun-Fei Fu ◽  
Kazem Ghabraie ◽  
Bernard Rolfe ◽  
Yanan Wang ◽  
Louis N. S. Chiu
Keyword(s):  
Additive Manufacturing ◽  
Compliant Mechanism ◽  
Optimization Method ◽  
Light Weight ◽  
Design For Additive Manufacturing ◽  
Compliance Minimization ◽  
Performance Requirements ◽  
Specific Performance ◽  
Smooth Design ◽  
Compliant Mechanism Design

The smooth design of self-supporting topologies has attracted great attention in the design for additive manufacturing (DfAM) field as it cannot only enhance the manufacturability of optimized designs but can obtain light-weight designs that satisfy specific performance requirements. This paper integrates Langelaar’s AM filter into the Smooth-Edged Material Distribution for Optimizing Topology (SEMDOT) algorithm—a new element-based topology optimization method capable of forming smooth boundaries—to obtain print-ready designs without introducing post-processing methods for smoothing boundaries before fabrication and adding extra support structures during fabrication. The effects of different build orientations and critical overhang angles on self-supporting topologies are demonstrated by solving several compliance minimization (stiffness maximization) problems. In addition, a typical compliant mechanism design problem—the force inverter design—is solved to further demonstrate the effectiveness of the combination between SEMDOT and Langelaar’s AM filter.

Load-Transmitter Constraint Sets: Part I—An Effective Tool for Visualizing Load Flow in Compliant Mechanisms and Structures

2010 ◽  
Author(s):  
Girish Krishnan ◽  
Charles Kim ◽  
Sridhar Kota
Keyword(s):  
Building Block ◽  
Deformation Behavior ◽  
Design Methodology ◽  
Compliant Mechanisms ◽  
Compliant Mechanism ◽  
Load Flow ◽  
Mathematical Framework ◽  
Design Synthesis ◽  
Fundamental Building Block ◽  
Block Based

Visualizing load flow aids in conceptual design synthesis of machine components. In this paper, we present a mathematical framework to visualize load flow in compliant mechanisms and structures. This framework uses the concept of transferred forces to quantify load flow from input to the output of a compliant mechanism. The key contribution of this paper is the identification a fundamental building block known as the Load-Transmitter Constraint (LTC) set, which enables load flow in a particular direction. The transferred force in each LTC set is shown to be independent of successive LTC sets that are attached to it. This enables a continuous visualization of load flow from the input to the output. Furthermore, we mathematically relate the load flow with the deformation behavior of the mechanism. We can thus explain the deformation behavior of a number of compliant mechanisms from literature by identifying its LTC sets to visualize load flow. This method can also be used to visualize load flow in optimal stiff structure topologies. The insight obtained from this visualization tool facilitates a systematic building block based design methodology for compliant mechanisms and structural topologies.

Piezoelectric Actuator Performance Metrics and Relation to Compliant Mechanism Design

2001 ◽  
Author(s):  
Hima Maddisetty ◽  
Mary Frecker
Keyword(s):  
Topology Optimization ◽  
Performance Metrics ◽  
Compliant Mechanisms ◽  
Compliant Mechanism ◽  
Mechanical Efficiency ◽  
High Energy ◽  
High Energy Density ◽  
High Bandwidth ◽  
Compliant Mechanism Design ◽  
Actuator Performance

Abstract Piezoceramic actuators have gained widespread use due to their desirable qualities of high force, high bandwidth, and high energy density. Compliant mechanisms can be designed for maximum stroke amplification of piezoceramic actuators using topology optimization. In this paper, the mechanical efficiency and other performance metrics of such compliant mechanism/actuator systems are studied. Various definitions of efficiency and other performance metrics of actuators with amplification mechanisms from the literature are reviewed. These metrics are then applied to two compliant mechanism example problems and the effect of the stiffness of the external load is investigated.

Low-power design tools---where is the impact? (panel)

1997 ◽  
Author(s):  
Jan M. Rabaey ◽  
Nanette Collins ◽  
Bill Bell ◽  
Jerry Frenkil ◽  
Vassilios Gerousis ◽  
...  
Keyword(s):  
Low Power ◽  
Low Power Design ◽  
Design Tools ◽  
The Impact

Legal Integrity and Recognition

2020 ◽  
pp. 93-112
Author(s):  
Elaine Chase ◽  
Jennifer Allsopp
Keyword(s):  
Young People ◽  
Building Block ◽  
Legal Status ◽  
Best Interests ◽  
Legal Recognition ◽  
Immigration Control ◽  
Socially Constructed ◽  
The Impact

This chapter examines the centrality of legal status as a building block for security and constructing a future in Europe. It engages with the realities of living with or without legal recognition in England and Italy and the impact this has on young people. The chapter considers these experiences within international and national frameworks of young people's rights and 'best interests'. It also looks at the serendipitous ways in which access to such rights are in fact socially constructed. As the chapter highlights, the arbitrary allocation of papers generates an inequitable set of life opportunities, or capabilities, as unaccompanied migrant young people become adults within the constraints of immigration control.

scholarly journals Shape-changing tensegrity-membrane building skin

2020 ◽  
Vol 310 ◽  
pp. 00046
Author(s):  
Lenka Kabošová ◽  
Eva Kormaníková ◽  
Stanislav Kmeť ◽  
Dušan Katunský
Keyword(s):  
Design Method ◽  
Global Climate ◽  
Weather Conditions ◽  
Building Envelope ◽  
Digital Design ◽  
Design Stage ◽  
Design Tools ◽  
Ambient Conditions ◽  
Weather Extremes ◽  
The Impact

Building skins are persistently exposed to changes in the weather, including the cases of weather extremes, increasing in frequency due to global climate change. As a consequence of the advancements of digital design tools, the integration of the weather conditions into the design process is much smoother. The impact of the ambient conditions on buildings and their structures can be digitally analyzed as early as in the conceptual design stage. These new design tools stimulate original ideas for shape-changing building skins, actively reacting to the dynamic weather conditions. In the paper, a digital design method is introduced, leading towards the design of a building skin, able of the passive shape adaptation when subjected to the wind. The designed building skin consists of a tensegrity structure where the tensioned elements are substituted by a tensile membrane, creating a self-equilibrated building skin element. In the previous research, a small prototype of this wind-adaptive element was created. The computer simulations are employed to predict the adaptive behavior of a bigger, full-scale building skin element. The before-mentioned building envelope becomes an active player in its surrounding environment, passively reacting to the wind in real-time, thanks to the geometric and material properties. Due to the local shape changes caused by the wind force, the wind can be perceived unconventionally through the adaptive building structure.

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