OmniFiber: Integrated Fluidic Fiber Actuators for Weaving Movement-based Interactions into the ‘Fabric of Everyday Life’

Title of the Paper

OmniFiber: Integrated Fluidic Fiber Actuators for Weaving Movement-based Interactions into the ‘Fabric of Everyday Life’

Paper Information

• Research Area: Human-Computer Interaction (HCI), Soft Robotics, and Smart Materials
• Keywords: Soft Actuators, Stretchable Sensors, Microfluidic Technology, E-Textiles, Haptic Feedback, Motion-based Human-Computer Interaction

Research Background and Problem Statement

• Problems and Challenges:
  • Current fiber-shaped actuators face significant limitations in flexibility, miniaturization, and integration into wearable devices. For example, they tend to be bulky, have limited motion range, and are unsafe for skin contact.
  • Existing fiber actuators struggle to achieve multifunctionality, lightweight design, and high power for complex postural movements and interactions.
• Significance:
  • Fibers are a fundamental geometric structure prevalent in nature and human life, with potential applications in clothing design to enable close interaction with human motion. In future body-based interaction designs, such materials could significantly expand application scenarios.
  • Programmable fiber actuators can not only provide haptic feedback but also convey complex information through deformation to support body-interaction operations.
• Research Motivation:
  • Addressing the shortcomings of existing materials in soft robotics, wearable devices, and haptic interfaces, this study proposes a reconfigurable fiber actuator system that can be seamlessly integrated into everyday fabrics.
  • For designers, the lack of design flexibility in current fiber actuators limits their potential in motion and shape-changing interaction designs.

Proposed Solution

• Method:
  • A novel soft actuator system, OmniFiber, is proposed. It is thin (<1.8mm), linear, fluid-driven, and embedded with pressure feedback sensors.
  • The system is designed with two core principles: weavability, manufacturing accessibility, and actuation versatility.
• Innovations:
  • A single fiber system that provides closed-loop strain control, shape programming capabilities, modular design, and miniaturization.
  • Development of a replicable multi-layer fiber manufacturing process, including embedded sensors, woven outer structures, and mechanical constraint components.
  • Introduction of a hardware system based on the FlowIO platform, supporting multi-channel strain control and real-time interaction via a Web-GUI.
• Implementation Steps:
  1. Fiber Material Construction: Fabricate soft tubes with various fluidic properties and create flexible sensors using carbon nanopowder and conductive coatings.
  2. Weaving and Mechanical Constraints: Use weaving or knitting techniques to create fiber structures and control their motion attributes (e.g., elongation, contraction, bending).
  3. Integration of Control System: Combine the FlowIO fluidic platform to achieve closed-loop strain control and responsiveness through sensor feedback.
  4. Multi-dimensional Design Space and Application Development: Utilize 2D and 3D fiber structure designs to enable complex motion, haptic feedback, and interactivity.

Research Outcomes

• Specific Results:
  • Developed a fluid-driven fiber actuator with a thickness of less than 1.8mm, capable of achieving axial elongation speeds of up to 245% (150mm/s) and generating a maximum force of 19N.
  • Demonstrated various motion modes, including fiber weaving, extension, bending, coiling, and surface texture changes.
  • Provided an accessible manufacturing process and proposed a mathematical model to predict fiber behavior.
• Advantages:
  • Compared to traditional McKibben actuators, OmniFiber combines the strength, fast response, and multifunctional integration required for interaction design.
  • Achieved thinner, lighter, and more haptically friendly fiber materials suitable for direct integration into textiles and safe skin contact.
  • Unlike energy-intensive thermally driven actuators, OmniFiber maintains pressure under static conditions without continuous energy consumption.
• Experiments and Evaluation:
  • Tested axial displacement, force output, and sensor-based feedback accuracy under different pressures.
  • Explored and validated how mechanical constraints shape fiber bending radius and deformation models.
  • Demonstrated its flexibility and practicality through application scenarios such as breathing guidance in clothing and gesture language translation.
• Limitations:
  • The manufacturing process relies on manual operations, affecting the efficiency of large-scale production.
  • Noise and rigidity issues limit user comfort during wear.
  • Lack of evaluation and design tool support for large-scale systems.
• Future Directions:
  • Optimize and automate the manufacturing process, such as introducing multi-material 3D printing or latent heat fiber stretching techniques.
  • Expand sensor integration techniques to improve the precision of localized haptic feedback.
  • Develop efficient, low-noise fluid-driven controllers to make the system more suitable for wearable applications.

This paper provides a novel blueprint for material and system design, advancing the technology of fiber-shaped actuators in interaction design and pointing the way for future research in motion-based interaction.