Triboelectric Tension-Sensing Yarn for Distributed Fabric Force Mapping
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Solution Overview
Problem
Existing force measurement technologies, such as strain gauges and Bragg gratings, are impractical in complex and constrained environments, particularly in soft robotics and exosuits, and lack effective tension sensing capabilities.
Innovation Solution
A tribo-induced charges based tension sensing yarn (TCTSY) system comprising conductive filaments with dielectric layers, which generates a potential difference upon axial tension application, allowing for distributed tension measurement through triboelectric charge transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional strain gauges are used for force measurement, then measurement precision can be achieved, but the device complexity and difficulty of operation increase in constrained environments
Solution Approach 1:
The patent changes the measurement principle from electrical resistance change (strain gauges) to triboelectric charge generation. By utilizing the triboelectric effect between dielectric-coated filaments, the system converts mechanical tension directly into electrical signals through charge transfer, eliminating the need for complex gauge attachment and isolation systems while maintaining measurement precision
Solution Approach 2:
The tension sensing yarn is self-sufficient, generating its own electrical signal through internal triboelectric charge transfer when subjected to tension. The dielectric-coated conductive filaments automatically produce measurable potential differences under load without requiring external power sources, complex wiring, or additional isolation components that conventional strain gauges need
2Measurement precision
If Bragg gratings are used for force measurement, then optical measurement precision is achieved, but the device becomes fragile and difficult to use in complex interactive settings
Solution Approach 1:
The patent transitions from optical parameter measurement (Bragg grating reflectivity) to electrical parameter measurement (triboelectric potential difference). This change enables the sensing element to be flexible and robust like textile fibers while maintaining high measurement precision through electrical signal detection, which is less susceptible to environmental interference than optical methods
Solution Approach 2:
The invention uses composite structure with conductive filaments coated with dielectric materials. This composite design combines the flexibility and robustness of textile fibers with the electrical sensing capability, creating a material that is both mechanically durable and electronically functional, unlike fragile optical gratings
3Adaptability or versatility
If artificial muscles are developed for soft robotics, then adaptability in constrained environments is improved, but the ability to measure output force becomes challenging
Solution Approach 1:
The patent merges the structural function of soft robotic actuators with the sensing function by integrating tension sensing yarns directly into the artificial muscle structure. The dielectric-coated conductive filaments are embedded within the muscle layers, allowing simultaneous structural support and force measurement in a unified component rather than separate elements
Solution Approach 2:
The artificial muscle structure itself generates the measurement signal through triboelectric charge transfer between its dielectric-coated filaments when subjected to contraction or tension forces. This self-sensing capability eliminates the need for separate sensors that would add complexity to the soft robotic system
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The TCTSY system provides accurate, quasi-linear force measurement with low hysteresis and robustness, suitable for soft robotics and wearable technologies, enabling precise tension sensing in constrained environments.
Implementation Method 1
when outer surfaces of the primary and secondary conductive filaments contact each other, charges are transferred between the contacted outer surfaces of the primary conductive filament and the secondary conductive filament
Data Source
AI summary
A tribo-induced charges based tension sensing yarn (TCTSY) system is provided, including a primary conductive filament having a first dielectric layer coated around an outer surface of the primary conductive filament; and a secondary conductive filament. When outer surfaces of the primary and secondary conductive filaments contact each other, charges are transferred between the contacted outer surfaces of the primary and secondary conductive filaments. When an axial tensile force is applied to the TCTSY system, a potential difference is generated by the transferred charges between the primary conductive filament and the secondary conductive filament, indicating a magnitude of the applied force. The TCTSY system can be integrated into warp and weft yarns of the fabric with weaving pattern, enabling fabric with distributed weft and warp-axial tension sensing where any two crossed TCTSY systems are configured to measure tension distribution over an area around crossed point of the fabric.