Modeling and simulation of a piezodisc generator under central load

Abstract

To enhance the energy-generating capability and obtain the optimal structural/material parameters, the deflection function of piezodisc and analytical model of energy generation is established based on the summation method in the theory of plates and shells. The influence of radius/thickness/Young's-modulus ratios of the piezodisc on energy generation was investigated. The research results show that there are different optimal thickness/radius/Young's-modulus ratios for a piezodisc generator under given central force and displacement to obtain maximal electrical energy. To enhance generated energy of a piezodisc under given central force, low Young's modulus ratio is helpful. While, high Young's modulus ratio should be utilized for a piezodisc generator under given central displacement. The Young's modulus radios of the piezodiscs with beryllium-bronze/brass/aluminum substrates are 1.5/1.1/0.94 respectively, and the optimal thickness-ratios/radius-ratios/maximal-energy under central force of 25 N are 0.55/0.43/0.35, 0.64/0.67/0.69, and 2.24/2.63/2.96 × 10 ^{-4} J. Whereas, those under given central displacement of 0.25 mm are 0.4/0.35/0.3, 0.85/0.86/0.87, and 2.7/2.19/1.96 × 10 ^{-4} J, respectively.