This paper concerns themechanism for harvesting energy fromhuman bodymotion.Thevibration signal fromhuman bodymotion\nduring walking and jogging was first measured using 3-axes vibration recorder placed at various places on the human body. The\nmeasured signal was then processed using Fourier series to investigate its frequency content. A mechanism was proposed to harvest\nthe energy from the low frequency-low amplitude human motion. This mechanism consists of the combined nonlinear hardening\nand softening mechanism which was aimed at widening the bandwidth as well as amplifying the low human motion frequency.\nThis was realized by using a translation-to-rotary mechanism which converts the translation motion of the human motion into the\nrotational motion.The nonlinearity in the system was realized by introducing a winding spring stiffness and the magnetic stiffness.\nQuasi-static and dynamic measurement were conducted to investigate the performance of the mechanism. The results show that,\nwith the right degree of nonlinearity, the two modes can be combined together to produce a wide flat response. For the frequency\namplification, the mechanism manages to increase the frequency by around 8 times in terms of rotational speed.
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