Structural Vibration Energy Harvesting Based On Triboelectric Nanogenerator

With the rapid development of transportation,the traffic pressure on the transportation structure are also increasing.To ensure the safety of the structure,it is essential to carry out structural sensing.The traditional structural sensing system use cable or built-in battery power for energy supply,which has the hidden danger of power supply interruption.The structure has long-term continuous vibration under the environmental dynamic load.The harvesting of structural vibration mechanical energy into electrical energy is expected to continuously supply energy to the sensing system As an emerging energy technology,triboelectric nanogenerator(TENG)technology has a huge development potential in the field of vibration energy harvesting.Utilizing TENG technology to harvest mechanical energy of structural vibration and supply energy to structural sensing system has research value and engineering significanceThis paper mainly designs a device based on TENG for structural vibration energy harvesting under the environmental dynamic load.Taking bridge as the host structure,the paper realize the selection of optimization schemes for the key parameters by experimental and theoretical methods.A theoretical model of the device was established,and a multi-parameter optimization method based on the dimensionless scale laws was further proposed,and related multi-parameter optimization analysis was carried out.The main research content is shown below(1)Based on the contact-separation mode TENG,a structural vibration energy harvesting device is designed.Taking bridge as the host structure,the feasibility of harvesting vibration energy for power is verified(2)The performance test of the device was carried out,and the optimization schemes of key parameters such as device base structure,dielectric pair material characteristics,circuit resistance,and excitation frequency were realized.The experimental results show that when the natural frequency of the device is close to the excitation frequency,the output voltage and average power reach the maximum.There is an optimal external resistance value to maximize the electrical output of the device.When the excitation frequency deviates from the natural frequency of the device,the energy capture effect of the device will fall.(3)Based on the bridge dynamics theory and the theory of the contact-separation mode TENG,the theoretical model of the structural vibration energy harvesting device was established.The key parameters of the output performance are determined,including the dynamic characteristics of the host structure and the structural design characteristics of the device.The accuracy of the theoretical model was verified through comparison of theoretical and experimental results(4)A multi-parameter optimization method for the electrostatic energy capture of beam structures based on the dimensionless scaling law is proposed.The accuracy of the optimization method is verified by the comparison of theoretical predictions and experimental results.According to the dynamic characteristics of the host structure and the structural design characteristics of the energy capture device,multi-parameter optimization analysis is carried out to realize the optimal design of the structural vibration energy harvesting deviceIn summary,this article provides ideas for the application of TENG technology to the research on the structural vibration mechanical energy harvesting,and provides a certain reference value for the optimal design of structural vibration energy harvesting devices.