A size dependent dynamic model for piezoelectric nanogenerators: effects of geometry, structural and environmental parameters

• Published in: Materials research express Vol. 5; no. 3; pp. 35508 - 35521
• Main Authors: Sadeghzadeh, Sadegh, Mir Saeed Ghazi, Seyyed Farshad
• Format: Journal Article
• Language: English
• Published: IOP Publishing 09.03.2018
• Subjects: dynamic response; free vibration; Generalized Differential Quadrature (GDQ) method; modified couple stress; piezoelectric nanogenerator (PENG)
• ISSN: 2053-1591; 2053-1591
• DOI: 10.1088/2053-1591/aab073

Piezoelectric Nanogenerator (PENG) is one of the novel energy harvester systems that recently, has been a subject of interest for researchers. By the use of nanogenerators, it's possible to harvest different forms of energy in the environment like mechanical vibrations and generate electricity. The structure of a PENG consists of vertical arrays of nanowires between two electrodes. In this paper, dynamic analysis of a PENG is studied numerically. The modified couple stress theory which includes one length scale material parameter is used to study the size-dependent behavior of PENGs. Then, by application of a complete form of linear hybrid piezoelectric-pyroelectric equations, and using the Euler-Bernoulli beam model, the equations of motion has been derived. Generalized Differential Quadrature (GDQ) method was employed to solve the equations of motion. The effect of damping ratio, temperature rise, excitation frequency and length scale parameter was studied. It was found that the PENG voltage maximizes at the resonant frequency of nanowire. The temperature rise has a significant effect on PENG's efficiency. When temperature increases about 10 K , the maximum voltage increases about 26%. Increasing the damping ratio, the maximum voltage decreases gradually.