# Parametric and Experimental Modeling of Axial-Type Piezoelectric Energy Generator with Active Base
## 1 Introduction
The authors optimized the design and experimentally evaluated the performance of the system. In [31], a piezoelectric power generator was developed with rotation amplitude limitation to avoid resonance conditions. The radially entrained magnetic force was used to collect energy. In [32], the authors considered and analyzed the collection of piezoelectric energy from the characteristics of compliant mechanisms. The authors divided configurations into monostable, multistable, multiple degrees of freedom, frequency upconversion and under load optimization. The authors also introduced a normalized power density to compare the power generation capabilities of a power generator [32]. In [33], the authors designed an energy harvester to extract energy from a smart road. The authors investigated the number of stacks layers, influences of connection mode, number of units and ratio of height to cross-sectional area [33]. Few studies have considered, depending on the area of application, a different design for the piezoelectric generator, in which a direct piezoelectric effect is used when the excitation in the sensitive element vibrates longitudinally (d33), by bending (d31) and by sharing [34; 35; 36]. In [37], a three-dimensional finite element analysis is presented for a cantilever plate structure excited by piezoelectric drive sections. The paper considered the modeling of actuators of the optimal configuration of actuators for selective excitation of the modes of a cantilever plate structure. Such elements can be used for technical analysis of vibrations of various structures using MEMS technologies [38]. The aim of this research is to carry out computational and experimental studies for estimation of the output parameters of a new type of piezoelectric energy generator of axial type, which has bimorph active structures on the base bar and symmetrically fixed piezoelectric cylinders at the base, located co-axially to bar; this is a new design of axial type piezoelectric generator. This design harvests energy from d31 and d33 simultaneously. In this design, proof mass can be mounted on the duralumin beam in between piezoelectric patches and the screw side. This variation in fixing the proof mass endows flexibility onto the natural frequencies of the PEGs. As per the mechanical vibration input, the first natural frequency can be adjected within the limit for high power output. This design providesflexibility and enhances the output power options compared to the other previous designs. The mechanical vibrations are used as an input parameter. This study concerns the new design of a generator, in which proof mass plays a key role in achieving higher power output. The analysis is also carried out on the electrical load dependency. The paper is organized as follows: Section 2 provides a description of model parameters and the electric scheme presents a description of axial-type PEG elements, a schematic description of the structure and a description of the parameters of materials used in both numerical and experimental modeling. Section 3 presents a description of the theoretical approach to the study of composite elastic, electroelastic and acoustic media in FE modeling. Section 4 covers the numerical simulation of the generator. The results of modal analysis and some output data of PEG parameters as a result of harmonic modeling are presented. Section 5 outlines a description of an experimental setup for testing the operation of PEG under a certain loading. A description of the results of testing PEG under dynamic loading in a certain frequency range is presented. Finally, Section 6 provides the conclusion.