Modeling and analysis of a taper ionic polymer metal composite energy harvester
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ORIGINAL ARTICLE
Modeling and analysis of a taper ionic polymer metal composite energy harvester Satya Narayan Patel1 • Sujoy Mukherjee1 Received: 28 October 2019 / Revised: 3 September 2020 / Accepted: 19 September 2020 Ó Institute of Smart Structures & Systems, Department of Aerospace Engineering, Indian Institute of Science, Bangalore 2020
Abstract Advances in the field of new smart materials suggested investigating their capabilities as energy harvesters. Ionic polymermetal composite (IPMC) is a relatively new type of smart materials and it belongs to the class of electroactive polymers (EAP). IPMC has already been considered as a potential candidate for energy harvester by several researchers. In this paper, a tapered (in thickness) IPMC energy harvester is considered to investigate the effects of modification of geometric configurations on energy harvesting capabilities. A mathematical model for the tapered IPMC harvester is developed. The energy harvester is analyzed using the proposed mathematical model. Numerical results show that the present harvester configuration can generate a significant amount of power. Moreover, the tapered IPMC energy harvester improves the fatigue life of the harvester as the tapered geometry reduces stress concentration at the fixed point. Therefore, the tapered IPMC energy harvester can be considered for several engineering applications such as wearable sensors, micro-electromechanical devices, etc. Keywords Smart materials Energy harvesting Tapered IPMC Electromechanical Vibrations Abbreviations 1 Taper ratio a ¼ tL0 t free b Constant related to the first mode shape of free vibration of harvester T Permittivity at zero applied stress e qi Resistivity of the ith element qipmc Material density of IPMC Ci Capacitance of the ith capacitor d Piezoelectric constant D Electric displacement E Electric field Lc Clamped length of the beam Lf Free length of the IPMC beam Q Charge over the surface Ri Electrical resistance of the ith element Rdc DC resistance of the energy harvester RL Load resistance s Laplace variable & Sujoy Mukherjee [email protected] 1
Mechanical Engineering Discipline, PDPM, Indian Institute of Information Technology, Design and Manufacturing, Jabalpur, Dumna Airport Road, Jabalpur, Madhya Pradesh 482005, India
S sE te T x
Mechanical strain Short circuit elastic compliance Effective thickness of the beam Applied stress Coordinate axis along the length direction
Introduction Capturing energy from one or more of the surrounding energy sources has become necessary to power small electronic components. Vibration-based energy harvesting is one of the potential alternatives for this purpose. Advances in the field of new smart materials suggested investigating their capabilities as energy harvesters. A significant amount of research has been focused towards understanding power harvesting using piezoelectric materials (Kim et al. 2011). One of the more promising types of new materials is ionic polymer-metal compos
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