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Optimization Design of the Inner Structure for a Bioinspired Heel Pad with Distinct Cushioning Property.

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Summary

This study developed a bioinspired heel pad mimicking human heel structure for superior cushioning. The optimized bionic heel pad significantly reduced impact forces during walking, enhancing prosthetic and robotic applications.

Keywords:
bionic designcushioning effectfinite element analysisheel padhuman walking

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Area of Science:

  • Biomechanical Engineering
  • Biomaterials Science
  • Rehabilitation Engineering

Background:

  • Current prosthetic and robotic cushioning relies on simple mechanisms and elastic pads.
  • Existing solutions often lack sufficient impact resistance, especially during ground contact.
  • Human heel pads exhibit superior cushioning due to complex internal structures.

Purpose of the Study:

  • To develop a bioinspired heel pad with optimized internal structures for enhanced cushioning performance.
  • To investigate the impact of bionic structures and material selection on cushioning properties.
  • To compare the effectiveness of the developed bionic heel pad against traditional designs.

Main Methods:

  • Magnetic Resonance Imaging (MRI) and literature review to determine human heel pad structures.
  • Fabrication of four five-layer bionic heel pads using soft rubber and resin, with and without internal structures.
  • Finite element simulations (static, impact, walking) to analyze deformations, ground reactions, and principal stress.
  • Human walking tests with 3D-printed bionic pads to validate simulation findings.

Main Results:

  • The optimal bionic heel pad, using soft rubber with internal structures, reduced peak vertical ground reaction force (GRF) by 28.0% during walking simulations compared to an unstructured resin pad.
  • Human walking tests confirmed a nearly 20% decrease in peak vertical GRF at normal speed with the 3D-printed bionic heel pad.
  • The soft rubber bionic heel pad demonstrated the best cushioning, while the unstructured resin pad performed the poorest.

Conclusions:

  • Optimized inner structures and material selection are crucial for superior cushioning in bionic heel pads.
  • The developed bioinspired heel pad offers significant improvements in impact absorption.
  • This technology holds potential for applications in lower limb prosthetics, robotics, and rehabilitation devices.