Simulation-based design optimization of a wrist exoskeleton.

Area of Science:

• Rehabilitation Robotics
• Biomechatronics
• Human-Machine Interaction

Background:

• Upper limb exoskeletons (ULEs) are crucial for assisting patients with impaired limb control in daily activities.
• Traditional ULE design involves end-user feedback, which can be time-consuming.
• Simulation-based design with human-in-the-loop models offers a potential solution to accelerate development.

Purpose of the Study:

• To optimize the design of an upper limb exoskeleton wrist joint.
• To investigate the efficacy of incorporating a torsional spring to compensate for motor torque.
• To demonstrate the benefits of human-in-the-loop simulation in exoskeleton design.

Main Methods:

• Utilized a human-in-the-loop simulation framework.
• Employed multibody modeling to analyze joint dynamics.
• Focused on optimizing an exoskeleton wrist joint design with a torsional spring.

Main Results:

• The torsional spring effectively compensated for required motor torque in the exoskeleton wrist joint.
• Multibody modeling confirmed that a torsional spring allows for a smaller, lighter motor.
• The simulation-based approach reduced design cycles and dependency on physical prototypes.

Conclusions:

• Integrating torsional springs in ULE joints is an effective strategy for designing lightweight and compact assistive devices.
• Human-in-the-loop simulation significantly accelerates the design and optimization of rehabilitation exoskeletons.
• This methodology enhances the convenience and utility of exoskeletons for individuals with severe impairments in performing activities of daily living.