Abstract
The performances of an energy harvester are usually limited. To improve these, the time-delayed feedback control is used in a novel nonlinear hybrid energy harvester for different types of external excitation. Based on the generalized harmonic transformation, the equivalent uncoupled equation, the vibration response, the harvested power and stochastic resonance of the hybrid energy harvester with time-delayed control are analyzed to obtain the standards for appropriate values of different control parameters. The response under harmonic excitation exhibits that time-delayed feedback control technique can stabilize unstable periodic orbits of the attractor to enhance the output power of electromechanical systems. For harmonic excitation or stochastic excitation, the value of the averaging harvested power of the system without time-delayed feedback control is lower than that of the control system, which plays a great realistic significance in the choose of the control parameters for improving the performance of the hybrid energy harvester. In case of combined harmonic and stochastic excitations, the time-delayed feedback control also can enhance stochastic resonance phenomenon, which can lead to a large response and give out a high output power.
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