Energy harvesting under combined aerodynamic and base excitations

摘要: Abstract This paper investigates the transduction of a piezoaeroelastic energy harvester under combination vibratory base excitations and aerodynamic loadings. The which consists rigid airfoil supported by nonlinear flexural torsional springs is placed in an incompressible air flow subjected to harmonic excitation plunge direction. Under this combined loading, undergoes complex motions strain piezoelectric element producing voltage across electric load. To capture qualitative behavior harvester, five-dimensional lumped-parameter model adopts quasi-steady aerodynamics used. A center manifold reduction implemented reduce full into one first-order ordinary differential equation. normal form reduced system then derived study slow modulation response amplitude phase near flutter instability. Below speed, observed be always periodic with serving amplify influence on reducing effective stiffness system, hence, increasing RMS output power. Beyond two distinct regions are observed. first occurs when small and/or frequency not close self-sustained oscillations induced In case, two-period quasiperiodic due presence incommensurate frequencies response. reduces second region, large enough eliminate causing lock each other. becomes power increases exhibiting little dependence excitation.