TensionFab: Fabrication of Room-scale Surface Structures From the Tension-Active Form of Planar Modules

Title of the Paper

TensionFab: Fabrication of Room-scale Surface Structures From the Tension-Active Form of Planar Modules

Paper Information

• Research Area: Human-Computer Interaction (HCI) and room-scale deformable structure design
• Keywords: fabrication, room-scale structures, 2D cutting, shape inversion design, tension structures, modularity, adaptive spaces, soft construction, interaction design, structural performance

Research Background and Problem Statement

• Identified Problems or Challenges:

  1. Current research on room-scale interactivity is primarily limited to fixed forms of walls, floors, or ceilings, with limited exploration of non-rectangular or dynamic spatial designs.
  2. Complex three-dimensional forms are difficult to fabricate, often requiring expensive production equipment or specialized assembly methods.
  3. Large-scale deformable structures face challenges in assembly and transportation due to weight, the number of connection nodes, and the structural complexity of traditional frameworks.

• Significance: This research aims to break the limitations of traditional interior design, addressing the human need for interaction with dynamic spaces and providing solutions for more flexible and diverse spatial designs.

• Research Motivation and Related Work:

  1. Methods for generating three-dimensional forms have been explored, such as using inflatables, origami, bent rods, and curved materials to create surfaces, but these face limitations in shape and material strength.
  2. Existing technological tools (e.g., laser cutting and CAD software) primarily focus on small-scale furniture or fixed structures, lacking support for large-scale, user-friendly fabrication.
  3. Optimization of traditional truss structures for efficient and modular construction methods remains an area of exploration, particularly in simplifying node connections.

Proposed Solution

• Proposed Solution: The authors propose TensionFab, a novel technique for creating room-scale deformable surface structures through 2D sheet cutting (e.g., MDF and plywood) and manual assembly. The method has the following features:

  1. Enables easy generation of deformable three-dimensional structures.
  2. Low technical barriers, accessible to non-experts.
  3. Sustainable, saving time and materials, and convenient for storage and transportation.

• Innovations:

  1. Modular Design: Based on the principles of frameworks and tension structures, the modules are planar but can transform into three-dimensional surfaces through tension.
  2. Inversion Design: A design tool generates 2D cutting and assembly data automatically based on the target surface.
  3. Utilizes low-cost materials and simplified assembly processes, significantly reducing the weight and complexity of traditional three-dimensional constructions.

• Implementation Steps and Key Technologies:

  1. Basic Principles: Define the composition of a single module (outer frame and inner arms) and achieve three-dimensional deformation through internal tension and frame bending.
  2. Module Combination: Develop methods for arranging modules (homogeneous/heterogeneous module combinations).
  3. Design Tools: Develop two design assistance tools:
     • For simple module and combination design.
     • For inversion design based on a given target surface.
  4. Structural Performance Analysis: Evaluate the shape accuracy and strength of the structure through finite element simulation (FEM) and physical loading experiments.

Research Outcomes

• Specific Outcomes:

  1. Proposed the TensionFab method and its design and fabrication workflow.
  2. Verified structural performance through experiments, including the load-bearing capacity of individual and combined modules.
  3. Modules generated using the inversion tool adhered to the target surface with an accuracy of 75%-96.9% within 7.5 mm.

• Advantages Compared to Existing Solutions:

  1. Compared to similar truss systems, TensionFab reduces the number of nodes, improving installation efficiency.
  2. Low technical barriers, requiring no complex tools or engineering expertise, making it consumer-friendly.
  3. Compared to common origami or inflatable structures, significantly reduces material usage and cost.

• Experimental or Evaluation Results:

  1. Single-module load-bearing experiments showed that modules with different connection joint levels could bear 38.8 to 45.8 times their own weight.
  2. In module combination experiments, the structure stably supported loads up to 47 times its own weight.
  3. FEM simulation analysis confirmed good deformation performance and internal stress distribution after module combination.

• Limitations and Future Directions:

  1. The method may fail on sharp angles or high-curvature target surfaces due to material limitations.
  2. Areas for improvement include: automatic generation of arm joint designs, support for broader material property settings, multi-layer structures to enhance rigidity, and exploration of "metamaterial" characteristics.
  3. Integration of actuators and sensors within modules to enable automation and dynamic deformation.