Vol. 223, Issue 7, July 2018, pp. 26-32

Abstract: This paper proposes a new technique for electrical energy harvesting from vibration energy generated in a shoe sole. In this technique stacked lead zirconate titanate (PZT) material was integrated into shoe sole. The PZT and the shoe sole system have been modelled and validated using the ABAQUS software. The sensitivity of the PZT part was found to be 0.0694 mV µm µN^-1. Similarly, the shoe sole model was in accordance with strain invariants which is directly based on the stretch ratios and was classified as hyper-elastic material. A statistical technique was used to obtain an average size of 28.0727 cm for the shoe sole computed from data of standard adult shoe sizes. The two parts were assembled together to function as a single unit. Our research shows that, as the applied force increases in PZT material, the output voltage also increases. For this reason, PZT material was integrated in to the shoe sole. The shoe sole is an area where the weight of human body is concentrated for optimal electrical energy harvesting. Furthermore, we have investigated that, for the pressure/force applied to the PZT material within a short time (approximately 1second), the electric potential attends its approximate maximum value of 0.016 V. The total amount harvested will be (0.016n) V, where n is the number of the stack PZT material. Thus, the amount of electrical energy harvested depends on the weight of the person wearing the shoe at a particular time and the number of the stack PZT material integrated into the shoe sole. Additionally, the research shows that, the output voltage generated by PZT material is independent of the size of the material. The output from each individual PZT unit was cascaded to obtain the total electrical energy harvested. The total electrical energy harvested was transferred wirelessly to the target electronic devices such as miners’ lamp, military gadget, etc. Therefore, the proposed technique will serve as a solution to power miners’ lamp, military electronic gadget (compass, radios, lighting etc.), lighting in situation where energy cannot be harvested from solar, during mining in underground tunnels and during movement in a battlefield especial when expecting opponent attack

Keywords: Finite element method, Electrical energy harvest, Stack PZT-Integrated shoe, Optimization, Random variable, Stack PZT, Vibration energy.

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