Energy Harvesting Combat Boot for Satellite Positioning

Area of Science:

• Energy Harvesting
• Biomechanical Engineering
• Portable Electronics

Background:

• Portable electronic devices are limited by battery capacity, necessitating frequent recharging.
• Current charging methods often disrupt user experience with electronic devices.
• Alternative power sources are needed to enhance the usability of portable electronics.

Purpose of the Study:

• To develop an alternative power source for portable electronics.
• To convert human walking motion into usable electrical energy.
• To demonstrate a self-powering solution for portable devices.

Main Methods:

• Designed a power harvesting system using air bulbs integrated into a shoe sole.
• Optimized air bulb placement to maximize airflow capture during foot-strikes.
• Utilized micro-turbines connected to DC motors to convert airflow into electricity.

Main Results:

• A prototype combat boot generated continuous power on the order of 10s of milliwatts.
• Power generation was achieved during walking at 3.0 mph over a 22 Ω load.
• The harvested energy was sufficient to power a passive GPS tracker for location relay.

Conclusions:

• Human walking motion can be effectively converted into electricity using shoe-integrated devices.
• The developed system offers a viable solution for powering low-power portable electronics without battery replacement.
• This technology has the potential to enhance the user experience of portable devices by providing continuous power.