Galloping Piezoelectric Energy Harvester for Low Wind Speed

Aiming at the natural environment with low wind velocity, galloping piezoelectric energy harvester (GPEH) is comprehensively optimized in three aspects. First, based on the fluid-solid coupling theory, the square cylinder in the GPEH is modified to improve the conversion of fluid energy into mechanical energy efficiency and reduce the galloping critical velocity of the energy harvester. Second, piezoelectric cantilever beam with variable cross section is established, and the analytical solution is obtained by piecewise Galerkin method, and the beam geometry is optimized by particle swarm optimization method. Third, considering the various connections between the resistors, capacitors, and inductors, the circuit of the energy harvester is optimized. Finite element simulation method established a multi-physics coupling model for the GPEH. The results show that at the uniform wind velocity with the same flow velocity, the output energy of the improved GPEH is significantly improved, and the galloping critical velocity of the system vibration is effectively reduced.