Cantilever-type piezoelectric BEHs  used piezoelectric bimorph material to extract the energy for bridge's health monitoring system.
Two linear and one nonlinear piezoelectric BEHs  are produced with the same material and have the identical cantilever beam architectures; moreover, the piezoelectric layers and sizes of these are also kept the same.
In this research, work BEHs are developed to power the bridge monitoring system.
The developed BEHs, prototype I and prototype II, are shown in Figures 7 and 8.
Figures 10 and 11 show open circuit voltage levels of BEHs with respect to excitation frequency at different acceleration levels.