Xie Dongming, Zheng Zhen, Zhu Yaoliang
Jinshan College of Fujian Agriculture and Forestry University, Fuzhou 350000, China.
College of Civil Engineering, Fuzhou University, Fuzhou 350000, China.
Heliyon. 2024 Feb 11;10(5):e26000. doi: 10.1016/j.heliyon.2024.e26000. eCollection 2024 Mar 15.
For bridges with high automobile traffic, a large amount of vibration is generated daily due to cars driving over imperfectly level roads, and a vibration energy harvester can convert this energy into electrical energy, thus providing energy for devices such as bridge health sensors. However, the traditional single degree of freedom magnetic levitation vibration energy harvester (SMEH) has the disadvantage of low output power, so this research designs an improved dual degree of freedom magnetic levitation vibration energy harvester (DMEH), and a mathematical model of the energy harvester is built for simulation tests and an optimization model based on NSGA-II algorithm is developed for optimizing the structural parameters of the energy harvester. The experimental results show that the maximum total output power of DMEH and SMEH on CSSBB1, CSSBB2 and CSSBB3 are 48.7 mW, 36.8 mW, 25.4 mW and 27.2 mW, 21.5 mW, 14.9 mW, respectively, and the minimum total magnet volumes of both on CSSBB1, CSSBB2 and CSSBB3 are 268 cm, 132 cm, 219 cm, 214 cm, 86.2 cm, 156 cm. Based on the experimental data, it is found that the maximum output power of the optimal solution of DMEH is larger than that of SMEH for the selected simply supported girder bridge project, and the volume of the former is also larger than that of the latter, but the degree of increase can still be adapted to the application environment. The research results have some reference significance for improving the energy harvesting efficiency of bridge vibration energy harvesters.
对于汽车交通流量大的桥梁，由于汽车在平整度欠佳的路面上行驶，每天都会产生大量振动，而振动能量采集器可将这种能量转化为电能，从而为桥梁健康传感器等设备供电。然而，传统的单自由度磁悬浮振动能量采集器（SMEH）存在输出功率低的缺点，因此本研究设计了一种改进的双自由度磁悬浮振动能量采集器（DMEH），建立了该能量采集器的数学模型进行仿真测试，并开发了基于NSGA-II算法的优化模型来优化能量采集器的结构参数。实验结果表明，DMEH和SMEH在CSSBB1、CSSBB2和CSSBB3上的最大总输出功率分别为48.7 mW、36.8 mW、25.4 mW和27.2 mW、21.5 mW、14.9 mW，两者在CSSBB1、CSSBB2和CSSBB3上的最小总磁体体积分别为268 cm、132 cm、219 cm、214 cm、86.2 cm、156 cm。基于实验数据发现，对于所选的简支梁桥项目，DMEH最优解的最大输出功率大于SMEH，且前者的体积也大于后者，但增大程度仍能适应应用环境。研究结果对提高桥梁振动能量采集器的能量采集效率具有一定的参考意义。
