The second technique was described by Hitt et al.3 This harvesting is similar in base concept to the harvesting described above in that it takes into account the mechanics of locomotion to harvest energy associated with the rotary motion of the leg-foot interface during the normal walking or running process. Figure I-4a shows the biomechanics of the walking process.

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FIGURE I-4 Soldier Power Regeneration Kit (SPaRK): (a) illustration of the biomechanics; (b) side view of device attached to combat boot; and (c) back view of device attached to combat boot. SOURCE: LTC Joseph Hitt, et al., Program Manager, DARPA, “Dismounted Soldier Biomechanical Power Regeneration,” presented at the Proceedings of the 27th Army Science Conference, Orlando, Fla., November 29 – December 2, 2010.

The mechanics of the Soldier Power Regeneration Kit (SPaRK) device, which is based on an inverted pendulum model, is described by Hitt et al. as follows.

          Soldier Power Regeneration Kit (SPaRK) will harvest energy during mid-stance of walking gait. The tibia rotates over the stance foot as the contralateral limb swings and positions for heel strike. During this time, the energy in the stance foot ankle joint is negative as the muscles

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3LTC Joseph Hitt, et al., Program Manager, DARPA, “Dismounted Soldier Biomechanical Power Regeneration,” presented at the Proceedings of the 27th Army Science Conference, Orlando, Fla., November 29 – December 2, 2010.



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