Abstract
The present work exploits the centripetal, Coriolis and Euler forces generated in a rotating windmill. The MEMS device is placed on the blade of a windmill to harvest the energy. Modal analysis is carried out to optimize the dimensions of the structure to match the desired conditions. The real time response of the structure and the voltage generated in the piezoelectric layer are evaluated using transient analysis. It was noticed that Euler and Coriolis forces have a significant contribution in the initial time when the wind turbine accelerates from rest. The later portion is dominated by the Coriolis and Euler forces, and in some instances they cancel out each other. However, there is always a steady contribution from the centripetal force which is proportional to the magnitude of angular velocity of the wind turbine.
Highlights
With the concerns over the depletion of fossil fuels as an energy source, renewable energy is gaining popularity
The MEMS device consists of a proof mass coupled to four Z-shaped cantilevers
The idea is to exploit the centripetal, Coriolis, and Euler forces generated in a rotating windmill, which otherwise goes unutilized since they increase the strain energy in the blades
Summary
With the concerns over the depletion of fossil fuels as an energy source, renewable energy is gaining popularity. The idea is to exploit the centripetal, Coriolis, and Euler forces generated in a rotating windmill, which otherwise goes unutilized since they increase the strain energy in the blades This gets subjected to random vibration, due to the wind as well as the vibrations of the whole structure. These forces are supplemented by Euler forces created because of angular acceleration or deceleration of the windmill All these forces, along with the random vibrations, produce stresses in the beams which can be converted into electricity with the help of piezoelectric material, which otherwise goes unutilized. PAVAN R, SHYAMSUNDAR P I, VENKATESH K P RAO is the optimum geometry with dimensions such that the beams are not too stiff, and the Coriolis and centripetal accelerations of the windmill rotor can cause vibrations in the proof mass, and stresses are generated in the beams so that energy can be harvested using a piezoelectric material. The material GaAs has a Zinc blende structure with piezoelectric constant, d , 2.63 PC/N
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