Legged Robot with Tensegrity Feature Bionic Knee Joint.

Area of Science:

• Robotics
• Biomechanics
• Mechanical Engineering

Background:

• Traditional legged robots rely heavily on complex joint motors and control systems, increasing costs and maintenance.
• Existing designs often fail to accurately replicate the human skeletal-muscular system's functionality.
• Improving joint mechanisms is crucial for advancing robotic locomotion and biomimicry.

Purpose of the Study:

• To introduce a novel bionic legged robot structure inspired by human leg morphology and kinematics.
• To replicate the human knee's variable instantaneous center of rotation (ICR) using the tensegrity principle.
• To overcome the conventional dependency on multiple joint motors in legged robots.

Main Methods:

• The study employs the tensegrity principle to design a bionic leg structure, drawing inspiration from human leg morphology.
• A system distinguishing between rolling and sliding movements replicates the human knee's variable ICR.
• A rope unlocking mechanism and tensegrity unit features enable compliance-rigid-compliance transitions without knee motors.

Main Results:

• The bionic leg successfully replicates the human knee's variable ICR, enabling gait resemblance and vibration absorption.
• The tensegrity unit's deformability and self-recovery, along with the rope unlocking mechanism, facilitate smooth joint transitions.
• The system achieves a full leg cycle movement using only a single hip DC motor and basic control.

Conclusions:

• The tensegrity-based bionic leg offers a cost-effective and low-maintenance alternative to conventional legged robots.
• This design successfully mimics human leg functionality, including gait and vibration absorption, with reduced mechanical complexity.
• The innovation demonstrates a new paradigm for legged robot design, minimizing reliance on intricate joint actuation.