Random Vibration Energy Harvesting And Experimental Research Based On Triboelectric Nanogenerators

With the rapid development of Internet of Things and microelectronics technology,portable and low-power electronic devices have gradually entered our daily lives.However,when these devices are deployed in large numbers in farms,forests,oceans and other situations,their energy supply becomes a serious problem.Limited by the capacity,environmental pollution,and high cost of traditional chemical batteries,researchers try to collect vibration energy in the environment to solve the energy supply problem.Since the vibration excitation generated by the environment is mostly random and short-term,the current energy harvesting from random environmental vibration is not ideal.The vibration energy harvesting devices based on the Triboelectric Nanogenerators(TENG)are suitable for the random environment energy harvest,because the TENG output is proportional to the square of the external excitation frequency,meaning a high energy conversion response to the external excitation frequency.Based on the disorder and randomness of vibration excitation in the natural environment,this thesis proposes a vibration energy harvesting method based on the TENG.This method aims to convert irregular vibrational mechanical energy into controlled,continuous rotational mechanical energy in the environment,which can drive the TENG to convert disordered environmental energy to ordered(controlled)electrical energy.The energy that can be harvested includes wave energy,current energy,and wind energy.This system uses the spiral spring to store energy,outputs the stored elastic potential energy in a controlled manner through the gear transmission and escapement,and then uses the stable output to drive the rotor of the TENG to rotate smoothly.Finally,this system can steadily and continually release electric energy through a process of harvesting-storage-release without manual intervention although the original energy is random and low-frequency.This thesis analyses the influence of external excitation on the TENG,completes the analysis of the energy device,simulates the dynamics of key components of the device based on Adams,and focuses on the effect of the device’s stable output.The components required for the device were machined using CNC technology,3D printing technology,and laser cutting.The experiments are in good agreement with the theoretical analysis.In addition,the experimental tests show that the energy harvesting device can produce a stable and continuous550 V open-circuit voltage and 6 μA short-circuit current under a random excitation of 0.5Hz~2.0 Hz,and supply energy to a commercial thermometer and 450 LED when connected to rectified current.