Bioinspired actuators with intrinsic muscle-like mechanical properties

Area of Science:

• Robotics
• Biomimetics
• Soft Actuators

Background:

• Biological muscles exhibit unique force-velocity and force-length properties enabling agile movements.
• Replicating these intrinsic muscle properties in artificial actuators remains a significant challenge for bioinspired robotics and prosthetics.

Purpose of the Study:

• To develop a bioinspired soft actuator, HimiSK (highly imitating skeletal muscle), that simultaneously exhibits intrinsic muscle-like force-velocity and force-length properties.
• To demonstrate the actuator's self-stability and robustness without external sensors or controllers.

Main Methods:

• Designed a soft actuator (HimiSK) by arranging synergistic contractile units within a flexible matrix, mimicking skeletal muscle architecture.
• Evaluated the actuator's intrinsic mechanical properties, including force-velocity and force-length relationships.
• Assessed the actuator's stability and robustness against external perturbations.

Main Results:

• The HimiSK actuator demonstrated force-velocity and force-length characteristics closely resembling biological muscle.
• The bioinspired architecture and adaptive matrix material provided inherent self-stability.
• The actuator showed robustness in response to external perturbations without needing sensors or controllers.

Conclusions:

• The HimiSK actuator successfully replicates key intrinsic properties of skeletal muscle.
• This bioinspired design offers a promising solution for creating advanced artificial actuators for robotics and prosthetics.
• The self-adaptive nature of the actuator enhances its applicability in complex, dynamic environments.