Influence of installation of piezoelectric stack energy harvesters placed at rail bottom on dynamic performance of a vehicle-track system

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (12) : 248-259.

DU Chengyun1, WANG Jianjun1, JIN Hao2, TANG Lihua3

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Abstract

Piezoelectric energy harvesting technology has received a lot of attention in the field of rail transportation. However, the current studies mainly focused on the structural design of piezoelectric energy harvester. The installation of energy harvesters will attach new devices into the track structure, which may affect the dynamic performance of the vehicle-track system and even threaten its operation safety. However, the effect of the installation of energy harvesters on the dynamic performance of the vehicle-track system has rarely been reported. Based on piezoelectric stack energy harvesters installed at rail bottom, a dynamic analysis model of vehicle-track-harvester coupled system is developed. The vertical vibration equations of rails and ballasts with single or multiple energy harvesters are established, and theoretical solutions are obtained by using a new fast explicit integration method program written in Matlab. The correctness of the procedure is verified by comparing the results with those of the existing literature. Further, for two installation methods of single and multiple energy harvesters, the effects of the equivalent stiffness of energy harvester on the dynamic performance of the vehicle-track system (such as rail displacement, rail acceleration, fastener force and body acceleration) are investigated, and the relationship between equivalent stiffness and train comfort is also evaluated. The results show that when the equivalent stiffness of the energy harvester is varied in the range of 0~60×106N/m, with the increase of the equivalent stiffness of the energy harvester, the maximum rail displacement, rail acceleration decreases and the fastener force decreases, the car body acceleration keeps almost unchanged, and the comfort of train running shows a small change. When the equivalent stiffness of the energy harvester is selected in the range of 0~2×106N/m, the installation of the energy harvester has little effect on the dynamic performance of the vehicle-track system. The study results provide a theoretical guidance for the design and installation of piezoelectric stack energy harvesters in the rail system.

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piezoelectric energy harvesters / vehicle-track system / rail bottom / piezoelectric stack energy harvester;

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DU Chengyun1, WANG Jianjun1, JIN Hao2, TANG Lihua3. Influence of installation of piezoelectric stack energy harvesters placed at rail bottom on dynamic performance of a vehicle-track system[J]. Journal of Vibration and Shock, 2024, 43(12): 248-259

References

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