For the first time, the power output of an electromagnetic magnetic levitation vibration energy harvester
was studied when placed on 10 human participants while walking and running on a treadmill from
2 mph (3.2 km/h) to up to 7 mph (11.3 km/h). The power generated from the device when participants
walked at 3 mph (4.8 km/h) averaged 71 W. When running at 6 mph, the power increased to 342 W.
The testing on participants revealed that due to unique gaits and body structure, acceleration spectrum
and damping can vary significantly between participants. Taller participants had a lower step frequency
and therefore lower frequency acceleration content, signifying that a single design may not be optimal
for all participants. Additionally, the estimated damping force varied largely between participants, from
3 to 8 mN. To minimize the effects of damping, the paper studies the effect of angle of attachment and
damping reduction techniques using low friction materials and a guide rail system, which improve power
output by over 50% when compared to the sub-optimal design.
For the first time, the power output of an electromagnetic magnetic levitation vibration energy harvester
was studied when placed on 10 human participants while walking and running on a treadmill from
2 mph (3.2 km/h) to up to 7 mph (11.3 km/h). The power generated from the device when participants
walked at 3 mph (4.8 km/h) averaged 71 W. When running at 6 mph, the power increased to 342 W.
The testing on participants revealed that due to unique gaits and body structure, acceleration spectrum
and damping can vary significantly between participants. Taller participants had a lower step frequency
and therefore lower frequency acceleration content, signifying that a single design may not be optimal
for all participants. Additionally, the estimated damping force varied largely between participants, from
3 to 8 mN. To minimize the effects of damping, the paper studies the effect of angle of attachment and
damping reduction techniques using low friction materials and a guide rail system, which improve power
output by over 50% when compared to the sub-optimal design.
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