Combining Haptic and Bang-Bang Braking Actions for Passive Robotic Walker Path Following

Area of Science:

• Robotics
• Gerontology
• Human-Computer Interaction

Background:

• Robotic walkers offer potential physical and cognitive support for older adults.
• Existing guidance systems have limitations in balancing safety, comfort, and cost.
• Need for integrated solutions that enhance user autonomy and safety.

Purpose of the Study:

• To propose and evaluate a low-cost, hybrid path-following strategy for robotic walkers.
• To combine mechanical braking guidance with vibrotactile haptic guidance for older adults.
• To assess the performance and user experience of the hybrid system compared to individual approaches.

Main Methods:

• Development of a hybrid guidance strategy integrating mechanical braking and vibrotactile feedback.
• Theoretical proof of the hybrid strategy's formal correctness.
• Experimental validation with 64-100 year old users, including psychological evaluations.

Main Results:

• The hybrid system significantly outperforms haptic-only and braking-only guidance.
• Maintains user comfort levels comparable to haptic-only systems.
• Achieves 41% of the path-following error of haptic-only systems and halves braking interventions.

Conclusions:

• The hybrid guidance strategy effectively combines safety and comfort for older adults using robotic walkers.
• This integrated approach offers a superior solution for path following compared to isolated methods.
• The system promotes user autonomy while ensuring safe navigation.