Modeling and optimization of vibration absorber beam combined with magneto-electro-elastic energy harvester

The energy from vibration can be used as a source to generate voltage. The use of a vibration absorber can minimize the vibrations of the structure and at the same time be used as an energy harvesting . In recent years, the use of intelligent materials capable of generating voltage has made significant progress in various fields, including microelectromechanical systems. In the present study, a continuous beam containing a layer of magnetoelectroelastic smart materials has been used as a dynamic absorber. This absorber with piezoelectric and piezomagnetic properties both helps to reduce the vibrations of the system by one degree of freedom and extracts energy from it. Considering a harmonic excitation force applied to the main system, the general absorber equations were extracted and the effect of different beam parameters on energy harvesting was investigated. Using optimization method and using genetic algorithm, appropriate values were obtained to achieve both goals The experimental response surface methodology was used to find the cost function. The studies were performed in the first three modes of Bernoulli Euler beam and it was found that the subsequent modes have little effect on the generated power. In fact, the highest energy harvesting occurred in the first mode and in the frequency range of 10 to 40 Hz. The vibrations of the main structure also decreased by about 65%.