The comparison of energy harvester performance of two degrees of freedom model in two different configurations with the base random excitation

In order to convert mechanical vibrations into useful electrical energy, is one of the goals of many researchers in today's science, and for this purpose, harvesting equipment with piezoelectric components has been used. To check the performance of this system, knowledge of the behavior and output of the vibration system, and the effect of different parameters of that system is of great importance. In the current research, it is tried to investigate the effects of different parameters on the performance of the harvester by modeling the vibration system as a two-degree-of-freedom model, in two different configurations. To check more closely and find a result closer to reality, using the theory of linear random vibrations, the stimulation in question was white noise type. In the mathematical modeling, two two-degree-of-freedom states have been investigated, in the first state, the piezoelectric between the base and the first mass, and in the second state, the piezoelectric between the base and the second mass has been assumed. After extracting the governing equations in each configuration and applying the input to the system with random excitation, the effect of all identified and introduced parameters in the system is studied, and the configuration with higher efficiency, in terms of the average energy harvester, is introduced and the results are expressed graphically.