The Research On Vortex-induced Vibration Power Generation Device Based On Piezoelectric Energy Recovery

Wind power generation is an efficient way to use clean energy.A series of mature technologies have been applied in the large-scale wind power generation systems to improve efficiency of power generation,but the researches on micro-wind devices is generation devices are relative less.With the energy converted by piezoelectric ceramic,most of micro-wind power generation devices generate electricity from structural vibration energy that caused by wind.This kind of micro-wind power generation device has the advantage of small size,simple structure,easily manufactured,no rotating shaft or a gear,and higher reliability.These devices can power the wireless sensor network node and other small devices for independent work.In this thesis,A wind power generation device of vortex-induced vibrational energy was proposed with piezoelectric energy harvest.The main work is as follows:(1)After analyze the current research of micro-wind power generation and vortex-induced vibration theory,a bluff body is designed with the elastic support of piezoelectric bimorph.A simulation in ANSYS,was performed to research the relationship between natural frequency and physical dimension of bluff body.(2)With piezoelectric equation and the characteristics of vortex-induced vibration,an equivalent circuit of the piezoelectric bimorph was analyzed for vortex-induced vibrational power generation device.The hardware circuit of power generation device was designed with a standard interface circuit of piezoelectric energy harvest and a LTC3588-1 voltage regulator circuit.With LTspice,the designed circuit was simulated to study the output voltage and power of the vortex-induced vibrational power generation device under different loads,frequencies and amplitudes.(3)To verify the effectiveness of the designed power generation device,an experimental platform was designed for the vortex-induced vibrational power generation device.The optimal load of the power generation device was derived from measured data and simulation results.In the experiments,the output voltage and power of standard interface circuit were analyzed under different wind speed,loads,and physical dimensions of bluff body.Also,the relationship between input voltage and output voltage in the LTC3588-1 regulator circuit was experimentally studied.The experimental results indicates that the optimal load of the vortex-induced vibrational power generation device is in good agreement with the calculation results.In the same wind speed,the maximum output power of 350.7?W is achieved by the device with the bluff body of rectangular shape.Under the same load and the same bluff body structure,the output voltage and power increases with the wind speed.