A Study Of Cylindrical Shell Piezoelectric Energy Harvesting And Active Vibration Control

The piezoelectric energy harvester is a device which can convert the vibration energy into the electric energy through the piezoelectric effect. Vibration phenomenon exists in the daily production and life, for example, pipe vibration, wing vibration, body movement, etc. Based on the model of the piping system, this study investigates the theory and experiment of the circular cylindrical shell piezoelectric energy harvester. Different from the traditional non-curvature structure piezoelectric energy harvester, the cylindrical shell piezoelectric energy harvester is a type of curvature structure piezoelectric energy harvester. This study explores the piezoelectric energy harvesting of a circular cylindrical shell and active vibration control, which contains following aspects.First, this study explores the spatial distribution of the open circuit modal energy of piezoelectric circular cylindrical shell, and also analysis the effect of piezoelectric patch size to the modal energy amplitude. Anymore, the effect of geometric parameters of cylindrical shell to the modal energy amplitude is also investigated.Second, a distributed parameter electromechanical model of cylindrical shell piezoelectric energy harvester is established, assuming the cylindrical shell is sinusoidal excited, the expression of the modal current, the modal voltage, and the modal power on the resistive load are derived.Third, the modal identification experiment is carried out. and the distributed parameter model of piezoelectric energy harvester is experimently validated. Furthermore, the energy harvesting circuit is designed. The power on the resistive load after rectifier and filter circuit is derived. The rectified and filtered direct current can drive the LED lights up. The capacitor charging experiment and the battery charging experiment are also carried out, and the charged battery can drive the micro motor work.Finally, the active vibration control experiment of cylindrical shell is investigated, the positive position feedback (i.e.. PPF) controller and resonant controller are designed, where the PPF controller is positive feedback controller, and the resonant controller is negative feedback controller. The control effect of the two controllers is analysised.