Power Backpack for Energy Harvesting and Reduced Load Impact

Area of Science:

• Triboelectric nanogenerators (TENGs)
• Biomechanics
• Wearable energy harvesting

Background:

• Long-distance walking with heavy loads causes fatigue, impacting hiking and rescue operations.
• There's a growing need for labor-saving devices and biomechanical energy harvesting for portable electronics and sensors.

Purpose of the Study:

• To develop a load-suspended backpack utilizing a TENG to harvest wasted human motion energy.
• To reduce the physical burden and fatigue associated with carrying heavy loads.

Main Methods:

• Incorporation of two elastomers in the backpack to decouple load and body movement.
• Theoretical analysis and field experiments to evaluate performance.
• Modeling and calculation of mechanical-to-electric energy conversion efficiency.

Main Results:

• Achieved a 28.75% reduction in vertical load oscillation.
• Reduced vertical force on the wearer by 21.08%.
• Demonstrated a mechanical-to-electric energy conversion efficiency of 14.02% during normal walking.

Conclusions:

• The load-suspended backpack offers labor-saving benefits, shock absorption, and electricity generation.
• It shows significant potential as a self-powered source for wearable electronics, GPS, and health sensors.