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An experimental and theoretical piezoelectric energy harvesting from a simply supported beam with moving mass

Mohaisen A. M., Ntayeesh T. J.

Archives of Materials Science and Engineering

2023

Vol. 123, nr 1

13--29

Purpose: The feasibility of harvesting electrical energy from mechanical vibration is demonstrated in the thesis. In the technique, energy is harvested from simply supported beam vibration under a moving mass using a thin piezoelectric material. Design/methodology/approach: The structure is represented by a basic beam of length L that is supported at both ends and traversed by a moving mass M travelling at a constant velocity v. The Euler-Bernoulli differential equation describes its behaviour. The dynamic analysis of a beam is performed by using three moving masses of (35.61, 65.81, and 79.41) gr each travelling three uniform speeds of (1.6, 2 and 2.4) m/s. A differential equation of the electromechanical system is obtained by transforming the piezoelectric constitutive equation and solved numerically by MATLAB. Findings: The results indicate that the numerical and experimental values for the midpoint deflection of the beam and the piezoelectric voltage are very close. Research limitations/implications: Using the COMSOL programme, the proposed approach is checked by comparing results with data obtained by the finite element method (FEM). An experimental setup was also built and constructed to determine the voltage created by the piezoelectric patch and the beam response as a result of the mass travelling along the beam. Practical implications: The results show that the dynamic deflection, piezoelectric voltage, and piezoelectric energy harvesting all increase as the speed and magnitude of the moving mass increase. The harvesting power vs. load resistance curve begins at zero, increases to a maximum value, and then remains almost constant as the resistance is increased further. The optimal length of the piezoelectric patch was obtained to be 0.63 m. When the length of the beam increases, the resonant frequency decreases, and at the same time the harvested energy increases. However, increasing the beam thickness has the opposite effect; whereas raising the beam width does not affect the resonant frequency but decreases energy harvesting. Originality/value: The most essential point here is the need to have correctly built scale models. They can provide a substantial amount of information at a low cost, accommodate a variety of test settings, and aid in the selection and verification of the most effective analytical model to resolve the actual issue.

2-dof piezoelectric actuator controller based on FPGA

Prusak D., Karpiel G., Gac K.

Mechanics and Control

2013

Vol. 32, no. 1

30--36

This article presents the method for controlling the piezolegs motor with the application of the FPGA (Field-programmable gate array) system and presents the results of conducted tests of the motor slider displacement, with various steering signal configurations. It includes also the review of piezoelectric motors solutions and characteristics of systems, based on FPGA systems. Suggested steering solution can be used for subsequent tests on piezolegs drives and can constitute positioning system element.

Artykuł przedstawia metodę sterowania silnikiem liniowym piezoelektrycznym typu piezolegs za pomocą układu FPGA oraz wyniki przeprowadzonych pomiarów przemieszczenia końca biegnika silnika, przy różnych konfiguracjach sygnałów sterujących. Dokonano również przeglądu rozwiązań silników piezoelektrycznych oraz określono cechy systemów opartych na układach FPGA. Sugerowane rozwiązanie sterowania może być wykorzystane do dalszych badań nad napędami typu piezolegs i może stanowić element systemu pozycjonowania.