Energy harvesting through a backpack employing a mechanically amplified piezoelectric stack

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Piezoelectric Energy Harvesting Solutions: A Review (2020, methodology): “To improve conversion efficiency, two mechanisms of force amplification frames are offered: concave shape [94] and convex shape [95].”
Enhanced mathematical modeling of the displacement amplification ratio for piezoelectric compliant mechanisms (2016, background): “For example, many precision positioning stages [11–13], active vibration isolators [14], and some energy harvesters [15] are designed based on a variety of rhombustype and bridge-type compliant mechanisms.”
A Survey of Wearable Devices and Challenges (2017, background): “[227], a novel energy harvesting backpack has been built, which can effectively generate electrical energy through the differential”
A review of energy harvesting using piezoelectric materials: state-of-the-art a decade later (2008–2018) (2019, methodology): “Expanding upon the work of Granstrom et al Feenstra et al in 2008 [385] investigated a backpack that used a mechanically amplified piezoelectric stack installed in the strap to harvest electrical power during walking (figure 12(c)).”