An Investigation into Resonant Frequency of Triangular V-Shaped Cantilever Piezoelectric Vibration Energy Harvester

Subject Areas : Engineering

R Hosseini ¹ , M Hamedi ²

1 - Young Researchers and Elite Club, South Tehran Branch, Islamic Azad University, Tehran
2 - School of Mechanical Engineering, University of Tehran, Tehran

Received: 2016-06-12 Accepted : 2016-08-14 Published : 2016-09-20

Keywords: Finite Element, Piezoelectric, Mechanical energy harvester, V-shaped cantilever, Resonant frequency,

Abstract :

Power supply is a bottle-neck problem of wireless micro-sensors, especially where the replacement of batteries is impossible or inconvenient. Now piezoelectric material is being used to harvest vibration energy for self-powered sensors. However, the geometry of a piezoelectric cantilever beam will greatly affect its vibration energy harvesting ability. This paper deduces a remarkably precise analytical formula for calculating the fundamental resonant frequency of V-shaped cantilevers using Rayleigh-Ritz method. This analytical formula, which is very convenient for mechanical energy harvester design based on Piezoelectric effect, is then validated by ABAQUS simulation. This formula raises a new perspective that, among all the V-shaped cantilevers and in comparison with rectangular one, the simplest tapered cantilever can lead to maximum resonant frequency and highest sensitivity.

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