Low Frequency Vibration Energy Harvesting of Piezoelectric Vibration Systems with an Adjustable Device and Inertial Amplifier Device

In order to facilitate the adjustment of parameters according to various environments during the operation and to increase the energy harvesting efficiency of the system, this article connects an adjustable gear unit and an inertial amplification unit to a structure with five springs.

In this article, the kinetic equation of the system is given and they are solved using the harmonic balance method. The amplitude-frequency response curves were plotted on this basis. Multi-color plots of root mean square (RMS) values of induced voltage and electric power were obtained using the Runge–Kutta method.

By rotating the gears, the geometrical parameters of the system can be changed, thus limiting the force–displacement characteristics of the system. The mass element is connected vertically to an inertial amplification device for changing the dynamic mass.

The rotation of gears can change the soft and hard characteristics of the nonlinear stiffness of the system and the characteristics of the potential energy curve. And the inertial amplification device can change the intrinsic frequency of the system.